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Bone_Screw_and_Plate_New_Design.py
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Bone_Screw_and_Plate_New_Design.py
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# -----------------------------------------------------------------------------
#
# Python code for the Bone and Screw model
# (parametrized for Abaqus CAE/Standard)
# -----------------------------------------------------------------------------
# -----------------------------------------------------------------------------
# To run the Python
#
# (make sure the Work Directory is set to the directory were this file is located )
#
# At Abaqus command window, type
# >>abaqus cae script=***.py
# or
# At Abaqus CAE menu,
# File -> Run Script
# or
# At Aabqus CAE command line,
# >>execfile('***.py')
# *****************************************************************************
# Import modules required for CAE and Python (No additional files requred)
# *****************************************************************************
from part import *
from material import *
from section import *
from assembly import *
from step import *
from interaction import *
from load import *
from mesh import *
from job import *
from sketch import *
from visualization import *
from connectorBehavior import *
from math import *
from Numeric import *
# *****************************************************************************
# Create a list of 'simulation properties' parameters
# *****************************************************************************
# Displacement Load (mm)
DispLoad=0.0227
# Friction Formulation for Tangential Contact Interaction (Lagrange, Coulomb, or Rough)
contactForm='Rough'
# Friction factor (Lagrange or Coulomb ONLY)
fricFact=2
# Bone Strength (Low, Med, or High)
BoneStrength='Med'
# Global Mesh Size
meshSize=0.65
# *****************************************************************************
# Create a list of 'mechanical properties' parameters
# *****************************************************************************
Eplate=104.1e3 # Young's Modulus Plate (N/mm^2)
Escrew=112e3 # Young's Modulus Screw (N/mm^2)
n=0.3 # Poisson's Ratio
if BoneStrength=='Low':
Ecortical=6e3 # Young's Modulus Cortical Bone (N/mm^2)
Etrabecular=0.04e3 # Young's Modulus Trabecular Bone (N/mm^2)
if BoneStrength=='Med':
Ecortical=12e3 # Young's Modulus Cortical Bone (N/mm^2)
Etrabecular=1.1e3 # Young's Modulus Trabecular Bone (N/mm^2)
if BoneStrength=='High':
Ecortical=25e3 # Young's Modulus Cortical Bone (N/mm^2)
Etrabecular=2.2e3 # Young's Modulus Trabecular Bone (N/mm^2)
# *****************************************************************************
# Create a list of 'geometrical properties' parameters
# *****************************************************************************
# Coordinates of Screw Hole 1 (cx,cy)
cx=5.715
cy=0
# Coordinates Screw Hole 2 (cx2,cy2)
cx2=8.285
cy2=7.04
# Radius of Screw Hole (R)
R=2.69/2
# Bone Thickness (dbone)
dbone=12
# Cortical Thickness (dcort)
dcort=0.75
# Trabecular Thickness (dtrab)
dtrab=dbone-2*dcort
# Plate Thickness(dplate)
dplate=1.6
# Length of Screw (dscrew)
dscrew=10.750
# *****************************************************************************
# Create model & assembly
# *****************************************************************************
model_name='Bone and Screw'
myModel=mdb.Model(name=model_name)
myAssem=myModel.rootAssembly
# *****************************************************************************
# Materials
# *****************************************************************************
myModel.Material(name='Pure TI Grade IV')
myModel.materials['Pure TI Grade IV'].Elastic(table=((
Eplate, n), ))
myModel.Material(name='Ti-6AL-4V')
myModel.materials['Ti-6AL-4V'].Elastic(table=((
Escrew, n), ))
myModel.Material(name='Cortical Bone')
myModel.materials['Cortical Bone'].Elastic(table=((
Ecortical, n), ))
myModel.Material(name='Trabecular Bone')
myModel.materials['Trabecular Bone'].Elastic(table=((
Etrabecular, n), ))
# *****************************************************************************
# Create Sections
# *****************************************************************************
myModel.HomogeneousSolidSection(material='Pure TI Grade IV',
name='Plate', thickness=None)
myModel.HomogeneousSolidSection(material='Ti-6AL-4V',
name='Screw', thickness=None)
myModel.HomogeneousSolidSection(material='Cortical Bone',
name='Cortical', thickness=None)
myModel.HomogeneousSolidSection(material='Trabecular Bone',
name='Trabecular', thickness=None)
# *****************************************************************************
# Define Function to Construct Shell Part for Partitioning Bone
# *****************************************************************************
def createPartitionBone(myModel, myAssem):
# ================= Create Section Sketch ==============================
BonePartitionSketch=myModel.ConstrainedSketch(name='Bone Partition Sketch',sheetSize=10.0)
# ================= Draw Sketch ========================================
BonePartitionSketch.rectangle(point1=(0.0, 9.265),point2=(14.96, -5.715))
BonePartitionSketch.rectangle(point1=(3.49, 2.225),point2=(7.94, -2.225))
BonePartitionSketch.rectangle(point1=(6.06, 9.265),point2=(10.51, 4.815))
BonePartitionSketch.Line(point1=(3.49,-2.225),point2=(3.49,-5.715))
BonePartitionSketch.Line(point1=(7.94,-2.225),point2=(7.94,-5.715))
rp=R*cos(pi/4)
BonePartitionSketch.CircleByCenterPerimeter(center=(cx,cy), point1=(cx+rp,cy+rp))
BonePartitionSketch.CircleByCenterPerimeter(center=(cx2,cy2), point1=(cx2+rp,cy2+rp))
BonePartitionSketch.Line(point1=(3.49,2.225),point2=(cx-rp,cy+rp))
BonePartitionSketch.Line(point1=(7.94,2.225),point2=(cx+rp,cy+rp))
BonePartitionSketch.Line(point1=(3.49,-2.225),point2=(cx-rp,cy-rp))
BonePartitionSketch.Line(point1=(7.94,-2.225),point2=(cx+rp,cy-rp))
BonePartitionSketch.Line(point1=(6.06,9.265),point2=(cx2-rp,cy2+rp))
BonePartitionSketch.Line(point1=(10.51,9.265),point2=(cx2+rp,cy2+rp))
BonePartitionSketch.Line(point1=(6.06,4.815),point2=(cx2-rp,cy2-rp))
BonePartitionSketch.Line(point1=(10.51,4.815),point2=(cx2+rp,cy2-rp))
#BonePartitionSketch.Line(point1=(3.49,2.225),point2=(3.49,4.815))
BonePartitionSketch.Line(point1=(3.49,4.815),point2=(6.06,4.815))
BonePartitionSketch.Line(point1=(7.94,2.225),point2=(10.51,4.815))
BonePartitionSketch.Line(point1=(0,-2.225),point2=(14.96,-2.225))
BonePartitionSketch.Line(point1=(0,2.225),point2=(14.96,2.225))
BonePartitionSketch.Line(point1=(0,4.815),point2=(14.96,4.815))
# ================= Create Part ========================================
BonePartitionPart=myModel.Part(dimensionality=THREE_D, name='Bone Partition', type=
DEFORMABLE_BODY)
BonePartitionPart.BaseShellExtrude(depth=dbone, sketch=BonePartitionSketch)
myAssem.Instance(dependent=ON, name='Bone Partition Part', part=BonePartitionPart)
# *****************************************************************************
# Define Function to Construct Bone Part
# *****************************************************************************
def createPartBone(myModel, myAssem):
# ================= Create Bone Section Sketches =======================
BoneSketch=myModel.ConstrainedSketch(name='Bone Sketch',sheetSize=10.0)
# ================= Draw Sketch ========================================
BoneSketch.rectangle(point1=(0.0, 9.265),point2=(14.96, -5.715))
# ================= Create Parts =======================================
BonePart=myModel.Part(dimensionality=THREE_D, name='Solid Bone',
type=DEFORMABLE_BODY)
BonePart.BaseSolidExtrude(sketch=BoneSketch, depth=dbone)
myAssem.Instance(dependent=ON, name='Solid Bone', part=BonePart)
# ================= Partition Bone Layers ==============================
face1 = BonePart.faces.findAt((0,0,0.))
BonePart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dcort)
BonePart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dcort+dtrab)
# ================= Assign Sections ====================================
d1 = BonePart.datums
pickedCells = BonePart.cells
BonePart.PartitionCellByDatumPlane(datumPlane=d1[2],
cells=pickedCells)
pickedCells = BonePart.cells
BonePart.PartitionCellByDatumPlane(datumPlane=d1[3],
cells=pickedCells)
pickedCells = BonePart.cells.findAt(((0,9.265,0),),
((14.96,9.265,0),), ((14.96,-5.715,0),),)
BonePart.Set(cells=pickedCells, name='Bottom Cortical')
BonePart.SectionAssignment(offset=0.0,
offsetField='', offsetType=MIDDLE_SURFACE, region=Region(
cells=pickedCells), sectionName='Cortical', thicknessAssignment=
FROM_SECTION)
pickedCells = BonePart.cells.findAt(((0,9.265,12),),
((14.96,9.265,12),), ((14.96,-5.715,12),),)
BonePart.Set(cells=pickedCells, name='Top Cortical')
BonePart.SectionAssignment(offset=0.0,
offsetField='', offsetType=MIDDLE_SURFACE, region=Region(
cells=pickedCells), sectionName='Cortical', thicknessAssignment=
FROM_SECTION)
pickedCells = BonePart.cells.findAt(((0,9.265,dtrab),),
((14.96,9.265,dtrab),), ((14.96,-5.715,dtrab),),)
BonePart.Set(cells=pickedCells, name='Trabecular')
BonePart.SectionAssignment(offset=0.0,
offsetField='', offsetType=MIDDLE_SURFACE, region=Region(
cells=pickedCells), sectionName='Trabecular', thicknessAssignment=
FROM_SECTION)
# *****************************************************************************
# Define Function to Construct Shell Part for Partitioning Plate
# *****************************************************************************
def createPartitionPlate(myModel, myAssem):
# ================= Create Plate Section Sketches =======================
PlatePartitionSketch=myModel.ConstrainedSketch(name='Plate Sketch',sheetSize=10.0)
# ================= Draw Sketch ========================================
PlatePartitionSketch.rectangle(point1=( 0.0, 4.715),point2=(2.46, 2.325))
PlatePartitionSketch.rectangle(point1=(3.49, 2.225),point2=(7.94, -2.225))
PlatePartitionSketch.rectangle(point1=(4.52, -3.255),point2=(6.91, -5.715))
PlatePartitionSketch.rectangle(point1=(6.06, 9.265),point2=(10.51, 4.815))
PlatePartitionSketch.Line(point1=(2.46,4.715),point2=(3.49,4.815))
PlatePartitionSketch.Line(point1=(2.46,2.325),point2=(3.49,2.225))
PlatePartitionSketch.Line(point1=(3.49,-2.225),point2=(4.52,-3.255))
PlatePartitionSketch.Line(point1=(7.94,-2.225),point2=(6.91,-3.255))
PlatePartitionSketch.Line(point1=(7.94,2.225),point2=(10.51,4.815))
PlatePartitionSketch.delete(objectList=(PlatePartitionSketch.geometry.findAt((2.46,3.42)),))
rp=R*cos(pi/4)
PlatePartitionSketch.CircleByCenterPerimeter(center=(cx,cy), point1=(cx+rp,cy+rp))
PlatePartitionSketch.CircleByCenterPerimeter(center=(cx2,cy2), point1=(cx2+rp,cy2+rp))
PlatePartitionSketch.Line(point1=(3.49,2.225),point2=(cx-rp,cy+rp))
PlatePartitionSketch.Line(point1=(7.94,2.225),point2=(cx+rp,cy+rp))
PlatePartitionSketch.Line(point1=(3.49,-2.225),point2=(cx-rp,cy-rp))
PlatePartitionSketch.Line(point1=(7.94,-2.225),point2=(cx+rp,cy-rp))
PlatePartitionSketch.Line(point1=(6.06,9.265),point2=(cx2-rp,cy2+rp))
PlatePartitionSketch.Line(point1=(10.51,9.265),point2=(cx2+rp,cy2+rp))
PlatePartitionSketch.Line(point1=(6.06,4.815),point2=(cx2-rp,cy2-rp))
PlatePartitionSketch.Line(point1=(10.51,4.815),point2=(cx2+rp,cy2-rp))
# ================= Create Parts =======================================
PlatePartitionPart=myModel.Part(dimensionality=THREE_D, name='Plate Partition', type=
DEFORMABLE_BODY)
PlatePartitionPart.BaseShellExtrude(depth=dplate, sketch=PlatePartitionSketch)
myAssem.Instance(dependent=OFF, name='Plate Partition Part', part=PlatePartitionPart)
myAssem.translate(instanceList=('Plate Partition Part',),
vector=(0,0,dbone))
# *****************************************************************************
# Define Function to Construct Plate Part
# *****************************************************************************
def createPartPlate(myModel, myAssem):
# ================= Create Plate Section Sketches =======================
PlateSketch=myModel.ConstrainedSketch(name='Plate Sketch',sheetSize=10.0)
# ================= Draw Sketch ========================================
PlateSketch.rectangle(point1=( 0.0, 4.715),point2=(2.46, 2.325))
PlateSketch.rectangle(point1=(3.49, 2.225),point2=(7.94, -2.225))
PlateSketch.rectangle(point1=(4.52, -3.255),point2=(6.91, -5.715))
PlateSketch.rectangle(point1=(6.06, 9.265),point2=(10.51, 4.815))
PlateSketch.Line(point1=(2.46,4.715),point2=(3.49,4.815))
PlateSketch.Line(point1=(2.46,2.325),point2=(3.49,2.225))
PlateSketch.Line(point1=(3.49,-2.225),point2=(4.52,-3.255))
PlateSketch.Line(point1=(7.94,-2.225),point2=(6.91,-3.255))
PlateSketch.Line(point1=(3.49,2.225),point2=(3.49,4.815))
PlateSketch.Line(point1=(3.49,4.815),point2=(6.06,4.815))
PlateSketch.Line(point1=(7.94,2.225),point2=(10.51,4.815))
PlateSketch.delete(objectList=(PlateSketch.geometry.findAt((2.46,3.52)),))
PlateSketch.delete(objectList=(PlateSketch.geometry.findAt((3.49,3.52)),))
PlateSketch.delete(objectList=(PlateSketch.geometry.findAt((5.7,-3.255)),))
PlateSketch.delete(objectList=(PlateSketch.geometry.findAt((5.7,-2.225)),))
PlateSketch.delete(objectList=(PlateSketch.geometry.findAt((5.7,2.225)),))
PlateSketch.delete(objectList=(PlateSketch.geometry.findAt((7.94,4.815)),))
# ================= Create Parts =======================================
PlatePart=myModel.Part(dimensionality=THREE_D, name='Solid Plate',
type=DEFORMABLE_BODY)
PlatePart.BaseSolidExtrude(sketch=PlateSketch, depth=dplate)
PlateInstance=myAssem.Instance(dependent=OFF, name='Solid Plate', part=PlatePart)
myAssem.translate(instanceList=('Solid Plate',),
vector=(0,0,dbone))
# ================= Assign Section =====================================
pickedCells=PlatePart.cells
PlatePart.SectionAssignment(offset=0.0,
offsetField='', offsetType=MIDDLE_SURFACE, region=Region(
cells=pickedCells), sectionName='Plate', thicknessAssignment=
FROM_SECTION)
# *****************************************************************************
# Define Function to Construct Screw Parts
# *****************************************************************************
def createPartScrew(myModel, myAssem):
rp=R*cos(pi/4)
# ================= Create Screw Section Sketch ========================
ScrewSketch=myModel.ConstrainedSketch(name='Screw Sketch',sheetSize=10.0)
ScrewSketch.CircleByCenterPerimeter(center=(cx,cy), point1=(cx+rp,cy+rp))
ScrewSketch2=myModel.ConstrainedSketch(name='Screw Sketch 2',sheetSize=10.0)
ScrewSketch2.CircleByCenterPerimeter(center=(cx2,cy2), point1=(cx2+rp,cy2+rp))
# ================= Create Parts =======================================
ScrewPart=myModel.Part(dimensionality=THREE_D, name='Screw 1',
type=DEFORMABLE_BODY)
ScrewPart.BaseSolidExtrude(sketch=ScrewSketch, depth=dscrew)
ScrewPart2=myModel.Part(dimensionality=THREE_D, name='Screw 2',
type=DEFORMABLE_BODY)
ScrewPart2.BaseSolidExtrude(sketch=ScrewSketch2, depth=dscrew)
# ================= Instance Part in Assembly ==========================
myAssem.Instance(dependent=ON, name='Screw 1', part=ScrewPart)
myAssem.translate(instanceList=('Screw 1',), vector=(0,0,dbone+dplate-dscrew))
myAssem.Instance(dependent=ON, name='Screw 2', part=ScrewPart2)
myAssem.translate(instanceList=('Screw 2',), vector=(0,0,dbone+dplate-dscrew))
# ================= Assign Section =====================================
pickedCells=ScrewPart.cells
ScrewPart.SectionAssignment(offset=0.0,
offsetField='', offsetType=MIDDLE_SURFACE, region=Region(
cells=pickedCells), sectionName='Screw', thicknessAssignment=
FROM_SECTION)
pickedCells=ScrewPart2.cells
ScrewPart2.SectionAssignment(offset=0.0,
offsetField='', offsetType=MIDDLE_SURFACE, region=Region(
cells=pickedCells), sectionName='Screw', thicknessAssignment=
FROM_SECTION)
# ================= Partition Screw Using Datum Planes =================
###### Case 1 - Screw only partially penetrates trabecular
if dscrew<(dplate+dcort+dtrab):
dxt = dplate+dcort+dtrab-dscrew
face1 = ScrewPart.faces.findAt((cx,cy,0.))
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dtrab-dxt)
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dtrab-dxt+dcort)
face2 = ScrewPart2.faces.findAt((cx2,cy2,0.))
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dtrab-dxt)
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dtrab-dxt+dcort)
d1 = ScrewPart.datums
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[3],
cells=pickedCells)
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[4],
cells=pickedCells)
d2 = ScrewPart2.datums
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[3],
cells=pickedCells)
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[4],
cells=pickedCells)
#============= Define Surfaces =================================
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate/2),),)
ScrewPart.Surface(side1Faces=face1, name='Plate')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort/2),),)
ScrewPart.Surface(side1Faces=face1, name='Top Cort')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort-(dtrab-dxt)/2),),)
ScrewPart.Surface(side1Faces=face1, name='Trab')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Plate')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Top Cort')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort-(dtrab-dxt)/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Trab')
###### Case 2 - Screw fully penetrates trabecular but doesn't penetrate bottom cortical
elif dscrew==(dplate+dcort+dtrab):
face1 = ScrewPart.faces.findAt((cx,cy,0.))
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dtrab)
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dtrab+dcort)
face2 = ScrewPart2.faces.findAt((cx2,cy2,0.))
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dtrab)
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dtrab+dcort)
d1 = ScrewPart.datums
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[3],
cells=pickedCells)
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[4],
cells=pickedCells)
d2 = ScrewPart2.datums
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[3],
cells=pickedCells)
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[4],
cells=pickedCells)
#============= Define Surfaces =================================
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate/2),),)
ScrewPart.Surface(side1Faces=face1, name='Plate')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort/2),),)
ScrewPart.Surface(side1Faces=face1, name='Top Cort')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort-dtrab/2),),)
ScrewPart.Surface(side1Faces=face1, name='Trab')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Plate')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Top Cort')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort-dtrab/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Trab')
###### Case 3 - Screw fully penetrates trabecular and partially penetrates bottom cortical
elif dscrew>(dplate+dcort+dtrab) and dscrew<(dplate+dbone):
dxt = dplate+dbone-dscrew
face1 = ScrewPart.faces.findAt((cx,cy,0.))
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dcort-dxt)
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dcort-dxt+dtrab)
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dcort-dxt+dtrab+dcort)
face2 = ScrewPart2.faces.findAt((cx2,cy2,0.))
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dcort-dxt)
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dcort-dxt+dtrab)
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dcort-dxt+dtrab+dcort)
d1 = ScrewPart.datums
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[3],
cells=pickedCells)
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[4],
cells=pickedCells)
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[5],
cells=pickedCells)
d2 = ScrewPart2.datums
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[3],
cells=pickedCells)
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[4],
cells=pickedCells)
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[5],
cells=pickedCells)
#============= Define Surfaces =================================
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate/2),),)
ScrewPart.Surface(side1Faces=face1, name='Plate')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort/2),),)
ScrewPart.Surface(side1Faces=face1, name='Top Cort')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort-dtrab/2),),)
ScrewPart.Surface(side1Faces=face1, name='Trab')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort-dtrab-(dcort-dxt)/2),),)
ScrewPart.Surface(side1Faces=face1, name='Bot Cort')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Plate')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Top Cort')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort-dtrab/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Trab')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort-dtrab-(dcort-dxt)/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Bot Cort')
###### Case 4 - Screw fully penetrates all bone layers
else:
face1 = ScrewPart.faces.findAt((cx,cy,0.))
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dcort)
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dcort+dtrab)
ScrewPart.DatumPlaneByOffset(plane=face1,flip=SIDE2, offset=dcort+dtrab+dcort)
face2 = ScrewPart2.faces.findAt((cx2,cy2,0.))
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dcort)
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dcort+dtrab)
ScrewPart2.DatumPlaneByOffset(plane=face2,flip=SIDE2, offset=dcort+dtrab+dcort)
d1 = ScrewPart.datums
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[3],
cells=pickedCells)
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[4],
cells=pickedCells)
pickedCells = ScrewPart.cells
ScrewPart.PartitionCellByDatumPlane(datumPlane=d1[5],
cells=pickedCells)
d2 = ScrewPart2.datums
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[3],
cells=pickedCells)
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[4],
cells=pickedCells)
pickedCells = ScrewPart2.cells
ScrewPart2.PartitionCellByDatumPlane(datumPlane=d2[5],
cells=pickedCells)
#============= Define Surfaces =================================
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate/2),),)
ScrewPart.Surface(side1Faces=face1, name='Plate')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort/2),),)
ScrewPart.Surface(side1Faces=face1, name='Top Cort')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort-dtrab/2),),)
ScrewPart.Surface(side1Faces=face1, name='Trab')
face1 = ScrewPart.faces.findAt(((cx+R,cy,dscrew-dplate-dcort-dtrab-dcort/2),),)
ScrewPart.Surface(side1Faces=face1, name='Bot Cort')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Plate')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Top Cort')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort-dtrab/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Trab')
face1 = ScrewPart2.faces.findAt(((cx2+R,cy2,dscrew-dplate-dcort-dtrab-dcort/2),),)
ScrewPart2.Surface(side1Faces=face1, name='Bot Cort')
# ================= Partition Screw by Planes at 45 degrees ============
ScrewPart.PartitionCellByPlaneThreePoints(
cells=ScrewPart.cells, point1=(cx,cy,0), point2=(cx+rp,cy+rp,0), point3=(cx+rp,cy+rp,dscrew))
ScrewPart.PartitionCellByPlaneThreePoints(
cells=ScrewPart.cells, point1=(cx,cy,0), point2=(cx-rp,cy+rp,0), point3=(cx-rp,cy+rp,dscrew))
ScrewPart2.PartitionCellByPlaneThreePoints(
cells=ScrewPart2.cells, point1=(cx2,cy2,0), point2=(cx2+rp,cy2+rp,0), point3=(cx2+rp,cy2+rp,dscrew))
ScrewPart2.PartitionCellByPlaneThreePoints(
cells=ScrewPart2.cells, point1=(cx2,cy2,0), point2=(cx2-rp,cy2+rp,0), point3=(cx2-rp,cy2+rp,dscrew))
#*****************************************************************************
# Call Functions
#*****************************************************************************
createPartitionBone(myModel, myAssem)
createPartBone(myModel, myAssem)
createPartitionPlate(myModel, myAssem)
createPartPlate(myModel, myAssem)
createPartScrew(myModel, myAssem)
#*****************************************************************************
# Merge Solid Bone with Shell Partition
#*****************************************************************************
BoneInstance=myAssem.InstanceFromBooleanMerge(domain=
GEOMETRY, instances=(
myAssem.instances['Solid Bone'],
myAssem.instances['Bone Partition Part']),
keepIntersections=ON, name='Bone', originalInstances=SUPPRESS)
myAssem.features.changeKey(fromName='Bone-1',
toName='Bone')
BonePart = mdb.models['Bone and Screw'].parts['Bone']
#*****************************************************************************
# Merge Solid Plate with Shell Partition
#*****************************************************************************
PlateInstance=myAssem.InstanceFromBooleanMerge(domain=
GEOMETRY, instances=(
myAssem.instances['Solid Plate'],
myAssem.instances['Plate Partition Part']),
keepIntersections=ON, name='Plate', originalInstances=SUPPRESS)
myAssem.features.changeKey(fromName='Plate-1',
toName='Plate')
PlatePart = mdb.models['Bone and Screw'].parts['Plate']
#*****************************************************************************
# Create Screw Holes
#*****************************************************************************
ScrewHolesSketch=myModel.ConstrainedSketch(gridSpacing=0.36, name=
'Screw Hole Sketch', sheetSize=14.96, transform=
BonePart.MakeSketchTransform(
sketchPlane=BonePart.faces.findAt((3.49/2,0,dbone)),
sketchPlaneSide=SIDE1,
sketchUpEdge=BonePart.edges.findAt((14.96,0,dbone)),
sketchOrientation=RIGHT, origin=(0, 0, dbone)))
BonePart.projectReferencesOntoSketch(filter=
COPLANAR_EDGES, sketch=ScrewHolesSketch)
rp= R*cos(pi/4)
ScrewHolesSketch.CircleByCenterPerimeter(center=(cx,cy), point1=(cx+rp,cy+rp))
ScrewHolesSketch.CircleByCenterPerimeter(center=(cx2,cy2), point1=(cx2+rp,cy2+rp))
ScrewHolesSketch2=myModel.ConstrainedSketch(gridSpacing=0.36, name=
'Screw Hole Sketch 2', sheetSize=14.96, transform=
PlatePart.MakeSketchTransform(
sketchPlane=PlatePart.faces.findAt((2.46/2,3.524,dbone+dplate)),
sketchPlaneSide=SIDE1,
sketchUpEdge=PlatePart.edges.findAt((7.94,0,dbone+dplate)),
sketchOrientation=RIGHT, origin=(0, 0, dbone+dplate)))
PlatePart.projectReferencesOntoSketch(filter=
COPLANAR_EDGES, sketch=ScrewHolesSketch2)
rp= R*cos(pi/4)
ScrewHolesSketch2.CircleByCenterPerimeter(center=(cx,cy), point1=(cx+rp,cy+rp))
ScrewHolesSketch2.CircleByCenterPerimeter(center=(cx2,cy2), point1=(cx2+rp,cy2+rp))
BonePart.CutExtrude(depth=dscrew-dplate,
flipExtrudeDirection=OFF, sketch=
ScrewHolesSketch, sketchOrientation=
RIGHT, sketchPlane=BonePart.faces.findAt((3.49/2,0,dbone)),
sketchPlaneSide=SIDE1, sketchUpEdge=
BonePart.edges.findAt((14.96,0,dbone)))
PlatePart.CutExtrude(depth=dplate,
flipExtrudeDirection=OFF, sketch=
ScrewHolesSketch2, sketchOrientation=
RIGHT, sketchPlane=PlatePart.faces.findAt((2.46/2,3.524,dbone+dplate)),
sketchPlaneSide=SIDE1, sketchUpEdge=
PlatePart.edges.findAt((7.94,0,dbone+dplate)))
#*****************************************************************************
# Mesh Parts
#*****************************************************************************
BonePart.seedPart(deviationFactor=0.1, size=meshSize)
BonePart.generateMesh()
PlatePart.seedPart(deviationFactor=0.1, size=meshSize)
PlatePart.generateMesh()
ScrewPart = mdb.models['Bone and Screw'].parts['Screw 1']
ScrewPart2 = mdb.models['Bone and Screw'].parts['Screw 2']
ScrewPart.seedPart(deviationFactor=0.1, size=meshSize)
ScrewPart.generateMesh()
ScrewPart2.seedPart(deviationFactor=0.1, size=meshSize)
ScrewPart2.generateMesh()
#*****************************************************************************
#Create Surfaces
#*****************************************************************************
face1 = PlatePart.faces.findAt(((cx+R,cy,dbone+dplate/2),),
((cx,cy+R,dbone+dplate/2),), ((cx-R,cy,dbone+dplate/2),),
((cx,cy-R,dbone+dplate/2),),)
PlatePart.Surface(side1Faces=face1, name='Int 1')
face1 = PlatePart.faces.findAt(((cx2+R,cy2,dbone+dplate/2),),
((cx2,cy2+R,dbone+dplate/2),), ((cx2-R,cy2,dbone+dplate/2),),
((cx2,cy2-R,dbone+dplate/2),),)
PlatePart.Surface(side1Faces=face1, name='Int 2')
###### Case 1 - Screw only partially penetrates trabecular
if dscrew<(dplate+dcort+dtrab):
dtrabpen = dscrew-dplate-dcort
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort/2),),
((cx,cy+R,dbone-dcort/2),), ((cx-R,cy,dbone-dcort/2),),
((cx,cy-R,dbone-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Top Cort')
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort-dtrabpen/2),),
((cx,cy+R,dbone-dcort-dtrabpen/2),), ((cx-R,cy,dbone-dcort-dtrabpen/2),),
((cx,cy-R,dbone-dcort-dtrabpen/2),),)
BonePart.Surface(side1Faces=face1, name='Trab')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort/2),),
((cx2,cy2+R,dbone-dcort/2),), ((cx2-R,cy2,dbone-dcort/2),),
((cx2,cy2-R,dbone-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Top Cort 2')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort-dtrabpen/2),),
((cx2,cy2+R,dbone-dcort-dtrabpen/2),), ((cx2-R,cy2,dbone-dcort-dtrabpen/2),),
((cx2,cy2-R,dbone-dcort-dtrabpen/2),),)
BonePart.Surface(side1Faces=face1, name='Trab 2')
myAssem.SurfaceByMerge(name='Hole Interior',
surfaces=(
myAssem.instances['Bone'].surfaces['Top Cort'],
myAssem.instances['Bone'].surfaces['Trab']))
myAssem.SurfaceByMerge(name='Hole 2 Interior',
surfaces=(
myAssem.instances['Bone'].surfaces['Top Cort 2'],
myAssem.instances['Bone'].surfaces['Trab 2']))
myAssem.SurfaceByMerge(name='Screw 1 Bone Contact Area',
surfaces=(
myAssem.instances['Screw 1'].surfaces['Top Cort'],
myAssem.instances['Screw 1'].surfaces['Trab']))
myAssem.SurfaceByMerge(name='Screw 2 Bone Contact Area',
surfaces=(
myAssem.instances['Screw 2'].surfaces['Top Cort'],
myAssem.instances['Screw 2'].surfaces['Trab']))
###### Case 2 - Screw fully penetrates trabecular but doesn't penetrate bottom cortical
elif dscrew==(dplate+dcort+dtrab):
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort/2),),
((cx,cy+R,dbone-dcort/2),), ((cx-R,cy,dbone-dcort/2),),
((cx,cy-R,dbone-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Top Cort')
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort-dtrab/2),),
((cx,cy+R,dbone-dcort-dtrab/2),), ((cx-R,cy,dbone-dcort-dtrab/2),),
((cx,cy-R,dbone-dcort-dtrab/2),),)
BonePart.Surface(side1Faces=face1, name='Trab')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort/2),),
((cx2,cy2+R,dbone-dcort/2),), ((cx2-R,cy2,dbone-dcort/2),),
((cx2,cy2-R,dbone-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Top Cort 2')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort-dtrab/2),),
((cx2,cy2+R,dbone-dcort-dtrab/2),), ((cx2-R,cy2,dbone-dcort-dtrab/2),),
((cx2,cy2-R,dbone-dcort-dtrab/2),),)
BonePart.Surface(side1Faces=face1, name='Trab 2')
myAssem.SurfaceByMerge(name='Hole Interior',
surfaces=(
myAssem.instances['Bone'].surfaces['Top Cort'],
myAssem.instances['Bone'].surfaces['Trab']))
myAssem.SurfaceByMerge(name='Hole 2 Interior',
surfaces=(
myAssem.instances['Bone'].surfaces['Top Cort 2'],
myAssem.instances['Bone'].surfaces['Trab 2']))
myAssem.SurfaceByMerge(name='Screw 1 Bone Contact Area',
surfaces=(
myAssem.instances['Screw 1'].surfaces['Top Cort'],
myAssem.instances['Screw 1'].surfaces['Trab']))
myAssem.SurfaceByMerge(name='Screw 2 Bone Contact Area',
surfaces=(
myAssem.instances['Screw 2'].surfaces['Top Cort'],
myAssem.instances['Screw 2'].surfaces['Trab']))
###### Case 3 - Screw fully penetrates trabecular and partially penetrates bottom cortical
elif dscrew>(dplate+dcort+dtrab) and dscrew<(dplate+dbone):
dxt = dplate+dbone-dscrew
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort/2),),
((cx,cy+R,dbone-dcort/2),), ((cx-R,cy,dbone-dcort/2),),
((cx,cy-R,dbone-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Top Cort')
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort-dtrab/2),),
((cx,cy+R,dbone-dcort-dtrab/2),), ((cx-R,cy,dbone-dcort-dtrab/2),),
((cx,cy-R,dbone-dcort-dtrab/2),),)
BonePart.Surface(side1Faces=face1, name='Trab')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort/2),),
((cx2,cy2+R,dbone-dcort/2),), ((cx2-R,cy2,dbone-dcort/2),),
((cx2,cy2-R,dbone-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Top Cort 2')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort-dtrab/2),),
((cx2,cy2+R,dbone-dcort-dtrab/2),), ((cx2-R,cy2,dbone-dcort-dtrab/2),),
((cx2,cy2-R,dbone-dcort-dtrab/2),),)
BonePart.Surface(side1Faces=face1, name='Trab 2')
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort-dtrab-(dcort-dxt)/2),),
((cx,cy+R,dbone-dcort-dtrab-(dcort-dxt)/2),), ((cx-R,cy,dbone-dcort-dtrab-(dcort-dxt)/2),),
((cx,cy-R,dbone-dcort-dtrab-(dcort-dxt)/2),),)
BonePart.Surface(side1Faces=face1, name='Bot Cort')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort-dtrab-(dcort-dxt)/2),),
((cx2,cy2+R,dbone-dcort-dtrab-(dcort-dxt)/2),), ((cx2-R,cy2,dbone-dcort-dtrab-(dcort-dxt)/2),),
((cx2,cy2-R,dbone-dcort-dtrab-(dcort-dxt)/2),),)
BonePart.Surface(side1Faces=face1, name='Bot Cort 2')
myAssem.SurfaceByMerge(name='Hole Interior',
surfaces=(
myAssem.instances['Bone'].surfaces['Top Cort'],
myAssem.instances['Bone'].surfaces['Trab'],
myAssem.instances['Bone'].surfaces['Bot Cort']))
myAssem.SurfaceByMerge(name='Hole 2 Interior',
surfaces=(
myAssem.instances['Bone'].surfaces['Top Cort 2'],
myAssem.instances['Bone'].surfaces['Trab 2'],
myAssem.instances['Bone'].surfaces['Bot Cort 2']))
myAssem.SurfaceByMerge(name='Screw 1 Bone Contact Area',
surfaces=(
myAssem.instances['Screw 1'].surfaces['Top Cort'],
myAssem.instances['Screw 1'].surfaces['Trab'],
myAssem.instances['Screw 1'].surfaces['Bot Cort']))
myAssem.SurfaceByMerge(name='Screw 2 Bone Contact Area',
surfaces=(
myAssem.instances['Screw 2'].surfaces['Top Cort'],
myAssem.instances['Screw 2'].surfaces['Trab'],
myAssem.instances['Screw 2'].surfaces['Bot Cort']))
###### Case 4 - Screw fully penetrates all bone layers
else:
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort/2),),
((cx,cy+R,dbone-dcort/2),), ((cx-R,cy,dbone-dcort/2),),
((cx,cy-R,dbone-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Top Cort')
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort-dtrab/2),),
((cx,cy+R,dbone-dcort-dtrab/2),), ((cx-R,cy,dbone-dcort-dtrab/2),),
((cx,cy-R,dbone-dcort-dtrab/2),),)
BonePart.Surface(side1Faces=face1, name='Trab')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort/2),),
((cx2,cy2+R,dbone-dcort/2),), ((cx2-R,cy2,dbone-dcort/2),),
((cx2,cy2-R,dbone-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Top Cort 2')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort-dtrab/2),),
((cx2,cy2+R,dbone-dcort-dtrab/2),), ((cx2-R,cy2,dbone-dcort-dtrab/2),),
((cx2,cy2-R,dbone-dcort-dtrab/2),),)
BonePart.Surface(side1Faces=face1, name='Trab 2')
face1 = BonePart.faces.findAt(((cx+R,cy,dbone-dcort-dtrab-dcort/2),),
((cx,cy+R,dbone-dcort-dtrab-dcort/2),), ((cx-R,cy,dbone-dcort-dtrab-dcort/2),),
((cx,cy-R,dbone-dcort-dtrab-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Bot Cort')
face1 = BonePart.faces.findAt(((cx2+R,cy2,dbone-dcort-dtrab-dcort/2),),
((cx2,cy2+R,dbone-dcort-dtrab-dcort/2),), ((cx2-R,cy2,dbone-dcort-dtrab-dcort/2),),
((cx2,cy2-R,dbone-dcort-dtrab-dcort/2),),)
BonePart.Surface(side1Faces=face1, name='Bot Cort 2')
myAssem.SurfaceByMerge(name='Hole Interior',
surfaces=(
myAssem.instances['Bone'].surfaces['Top Cort'],
myAssem.instances['Bone'].surfaces['Trab'],
myAssem.instances['Bone'].surfaces['Bot Cort']))
myAssem.SurfaceByMerge(name='Hole 2 Interior',
surfaces=(
myAssem.instances['Bone'].surfaces['Top Cort 2'],
myAssem.instances['Bone'].surfaces['Trab 2'],
myAssem.instances['Bone'].surfaces['Bot Cort 2']))
myAssem.SurfaceByMerge(name='Screw 1 Bone Contact Area',
surfaces=(
myAssem.instances['Screw 1'].surfaces['Top Cort'],
myAssem.instances['Screw 1'].surfaces['Trab'],
myAssem.instances['Screw 1'].surfaces['Bot Cort']))
myAssem.SurfaceByMerge(name='Screw 2 Bone Contact Area',
surfaces=(
myAssem.instances['Screw 2'].surfaces['Top Cort'],
myAssem.instances['Screw 2'].surfaces['Trab'],
myAssem.instances['Screw 1'].surfaces['Bot Cort']))
#*****************************************************************************
#Create Sets
#*****************************************************************************
face1 = BoneInstance.faces.findAt(((1.745,-5.715,dcort/2),),
((1.745,-5.715,dcort+dtrab/2),), ((1.745,-5.715,dcort+dtrab+dcort/2),),
((5.715,-5.715,dcort/2),), ((5.715,-5.715,dcort+dtrab/2),),
((5.715,-5.715,dcort+dtrab+dcort/2),), ((11.45,-5.715,dcort/2),),
((11.45,-5.715,dcort+dtrab/2),), ((11.45,-5.715,dcort+dtrab+dcort/2),),)
myAssem.Set(faces=face1, name='Bone -Y Plane')
face1 = BoneInstance.faces.findAt(((14.96,-3.97,dcort/2),),
((14.96,-3.97,dcort+dtrab/2),), ((14.96,-3.97,dcort+dtrab+dcort/2),),
((14.96,0,dcort/2),), ((14.96,0,dcort+dtrab/2),),
((14.96,0,dcort+dtrab+dcort/2),), ((14.96,3.52,dcort/2),),
((14.96,3.52,dcort+dtrab/2),), ((14.96,3.52,dcort+dtrab+dcort/2),),
((14.96,7.04,dcort/2),),
((14.96,7.04,dcort+dtrab/2),), ((14.96,7.04,dcort+dtrab+dcort/2),),)
myAssem.Set(faces=face1, name='Bone X Plane')
face1 = PlateInstance.faces.findAt(((0.,3.52,dbone+dplate),),)
myAssem.Set(faces=face1, name='Plate -X Plane')
face1 = PlateInstance.faces.findAt(((5.715,-5.715,dbone+dplate),),)
myAssem.Set(faces=face1, name='Plate -Y Plane')
# *****************************************************************************
# Define Contact
# *****************************************************************************
myModel.ContactProperty('Lagrange Friction')
myModel.interactionProperties['Lagrange Friction'].TangentialBehavior(
dependencies=0, directionality=ISOTROPIC, formulation=LAGRANGE,
pressureDependency=OFF, shearStressLimit=None, slipRateDependency=OFF,
table=((fricFact, ), ), temperatureDependency=OFF)
myModel.ContactProperty('Rough Contact')
myModel.interactionProperties['Rough Contact'].TangentialBehavior(
formulation=ROUGH)
mdb.models['Bone and Screw'].ContactProperty(
'Coulomb Friction (Penalty)')
mdb.models['Bone and Screw'].interactionProperties['Coulomb Friction (Penalty)'].TangentialBehavior(
dependencies=0, directionality=ISOTROPIC, elasticSlipStiffness=None,
formulation=PENALTY, fraction=0.005, maximumElasticSlip=FRACTION,
pressureDependency=OFF, shearStressLimit=None, slipRateDependency=OFF,
table=((fricFact, ), ), temperatureDependency=OFF)
# ================= Tie Constraints ===========================================
myModel.Tie(adjust=ON, master=
myAssem.instances['Plate'].surfaces['Int 1']
, name='Tie Screw 1 to Plate', positionToleranceMethod=COMPUTED, slave=
myAssem.instances['Screw 1'].surfaces['Plate']
, thickness=ON, tieRotations=ON)
myModel.Tie(adjust=ON, master=
myAssem.instances['Plate'].surfaces['Int 2']
, name='Tie Screw 2 to Plate', positionToleranceMethod=COMPUTED, slave=
myAssem.instances['Screw 2'].surfaces['Plate']
, thickness=ON, tieRotations=ON)
# ================= Interactions ==============================================
myModel.SurfaceToSurfaceContactStd(adjustMethod=NONE,
clearanceRegion=None, createStepName='Initial', datumAxis=None,
initialClearance=OMIT, interactionProperty='Lagrange Friction', master=
myAssem.surfaces['Screw 1 Bone Contact Area']
, name='Screw 1 and Bone', slave=
myAssem.surfaces['Hole Interior']
, sliding=SMALL, thickness=ON)
myModel.SurfaceToSurfaceContactStd(adjustMethod=NONE,
clearanceRegion=None, createStepName='Initial', datumAxis=None,
initialClearance=OMIT, interactionProperty='Lagrange Friction', master=
myAssem.surfaces['Screw 2 Bone Contact Area']
, name='Screw 2 and Bone', slave=
myAssem.surfaces['Hole 2 Interior']
, sliding=SMALL, thickness=ON)
if contactForm=='Rough':
myModel.interactions['Screw 1 and Bone'].setValuesInStep(
interactionProperty='Rough Contact', stepName='Initial')
myModel.interactions['Screw 2 and Bone'].setValuesInStep(
interactionProperty='Rough Contact', stepName='Initial')
if contactForm=='Coulomb':
myModel.interactions['Screw 1 and Bone'].setValuesInStep(
interactionProperty='Coulomb Friction (Penalty)', stepName='Initial')
myModel.interactions['Screw 2 and Bone'].setValuesInStep(
interactionProperty='Coulomb Friction (Penalty)', stepName='Initial')
# *****************************************************************************
# Loads
# *****************************************************************************
myModel.StaticStep(name='Loads (Static, General)',
previous='Initial')
myModel.steps['Loads (Static, General)'].setValues(
initialInc=0.1, maxInc=0.1)
region = myAssem.sets['Bone X Plane']
myModel.DisplacementBC(amplitude=UNSET,
createStepName='Loads (Static, General)', distributionType=UNIFORM,
fieldName='', fixed=OFF, localCsys=None, name='Disp Load of Bone X Plane',
region=region,
u1=DispLoad, u2=UNSET, u3=UNSET, ur1=UNSET, ur2=UNSET, ur3=UNSET)
# *****************************************************************************
# Boundary Conditions
# *****************************************************************************
region = myAssem.sets['Bone X Plane']
myModel.DisplacementBC(amplitude=UNSET, createStepName=
'Initial', distributionType=UNIFORM, fieldName='', localCsys=None, name=
'Fix Z Disp of Bone X Plane', region=region, u1=UNSET, u2=UNSET,
u3=SET, ur1=UNSET, ur2=UNSET, ur3=
UNSET)
region = myAssem.sets['Bone -Y Plane']
myModel.YsymmBC(createStepName='Initial', name='Y Symm of Bone -Y Plane',
region=region)
region = myAssem.sets['Plate -Y Plane']
myModel.YsymmBC(createStepName='Initial', name='Y Symm of Plate -Y Plane',
region=region)
region = myAssem.sets['Plate -X Plane']
myModel.XsymmBC(createStepName='Initial', name='X Symm of Plate -X Plane',
region=region)
# *****************************************************************************
# Delete Extra Parts Used in Construction
# *****************************************************************************
del myModel.parts['Bone Partition']
del myModel.parts['Plate Partition']
del myModel.parts['Solid Bone']
del myModel.parts['Solid Plate']
myAssem.deleteFeatures(('Bone Partition Part','Plate Partition Part',
'Solid Bone','Solid Plate'))
# *****************************************************************************
# Create Job