290 lines
11 KiB
Python
290 lines
11 KiB
Python
|
# GrainGen V3.0
|
||
|
|
# This script generates idealised and representative meshed micro-structure geometries
|
||
|
|
# in 2-D through the Abaqus geometry kernel. - J. Grogan, 25/09/2011
|
||
|
|
#
|
||
|
|
# Import Abaqus and External Modules
|
||
|
|
from abaqusConstants import *
|
||
|
|
from abaqus import *
|
||
|
|
import random
|
||
|
|
import regionToolset
|
||
|
|
import mesh
|
||
|
|
import step
|
||
|
|
import part
|
||
|
|
import interaction
|
||
|
|
import subprocess
|
||
|
|
randomSeed=[39928822]
|
||
|
|
randomSeed.append(39764)
|
||
|
|
randomSeed.append(19230045)
|
||
|
|
randomSeed.append(452398)
|
||
|
|
randomSeed.append(872315)
|
||
|
|
randomSeed.append(794738)
|
||
|
|
randomSeed.append(224492579)
|
||
|
|
randomSeed.append(96502382)
|
||
|
|
randomSeed.append(4921299)
|
||
|
|
randomSeed.append(3113145)
|
||
|
|
randomSeed.append(36677835)
|
||
|
|
for eachModel in range(0,1):
|
||
|
|
#
|
||
|
|
# Create Model Database
|
||
|
|
VerFile=Mdb(pathName="MStructure")
|
||
|
|
VerModel=VerFile.models['Model-1']
|
||
|
|
VerAssembly=VerModel.rootAssembly
|
||
|
|
#
|
||
|
|
# Assign Model Parameters
|
||
|
|
#
|
||
|
|
# Underlying Geometry
|
||
|
|
xSize=0.1
|
||
|
|
ySize=0.03
|
||
|
|
#
|
||
|
|
# Microstructure Geometry
|
||
|
|
charLength=0.0119# Grain Side Length
|
||
|
|
numX=100
|
||
|
|
numY=100
|
||
|
|
numGrains=120 # Voronoi Only
|
||
|
|
hardRad=0.00 # Voronoi Only
|
||
|
|
#
|
||
|
|
# Other Parametersvgrain vumat
|
||
|
|
grainType='Voronoi' # Options: Square, Hexagon, Voronoi
|
||
|
|
meshSize=0.01
|
||
|
|
analysis='Tension' # Options: Tension, Bending
|
||
|
|
#
|
||
|
|
# Draw Base Part
|
||
|
|
BasePart=VerModel.Part(name='Base', dimensionality=TWO_D_PLANAR,type=DEFORMABLE_BODY)
|
||
|
|
BasePart.DatumPointByCoordinate((0,0,0))
|
||
|
|
BasePart.DatumPointByCoordinate((xSize,0,0))
|
||
|
|
BasePart.DatumPointByCoordinate((0,ySize,0))
|
||
|
|
pdatums=BasePart.datums
|
||
|
|
BasePart.DatumPlaneByThreePoints(point1=pdatums[1], point2=pdatums[2], point3=pdatums[3])
|
||
|
|
BasePart.DatumAxisByTwoPoint(point1=pdatums[1],point2=pdatums[2])
|
||
|
|
partTransform = BasePart.MakeSketchTransform(sketchPlane=pdatums[4], sketchUpEdge=pdatums[5],
|
||
|
|
sketchPlaneSide=SIDE1, sketchOrientation=BOTTOM, origin=(0,0,0))
|
||
|
|
BaseSketch = VerModel.ConstrainedSketch(name='Base',sheetSize=200, transform=partTransform)
|
||
|
|
#
|
||
|
|
BaseSketch.Line(point1=(0.,0.),point2=(xSize,0.))
|
||
|
|
BaseSketch.Line(point1=(xSize,0.),point2=(xSize,ySize))
|
||
|
|
BaseSketch.Line(point1=(xSize,ySize),point2=(0.,ySize))
|
||
|
|
BaseSketch.Line(point1=(0.,ySize),point2=(0.,0.))
|
||
|
|
BasePart.BaseShell(sketch=BaseSketch)
|
||
|
|
BasePart=VerModel.parts['Base']
|
||
|
|
#
|
||
|
|
# Draw Microstructure and Partition Base Part
|
||
|
|
ParSketch=VerModel.ConstrainedSketch(name='Base',sheetSize=200, transform=partTransform)
|
||
|
|
if grainType=='Square':
|
||
|
|
offset=0.
|
||
|
|
for i in range(0,numX):
|
||
|
|
ParSketch.Line(point1=(offset,0.),point2=(offset,numY*charLength))
|
||
|
|
offset=offset+charLength
|
||
|
|
offset=0.
|
||
|
|
for i in range(0,numY):
|
||
|
|
ParSketch.Line(point1=(0.,offset),point2=(numX*charLength,offset))
|
||
|
|
offset=offset+charLength
|
||
|
|
elif grainType=='Hexagon':
|
||
|
|
yLength=sin(radians(30.))*charLength
|
||
|
|
xLength=cos(radians(30.))*charLength
|
||
|
|
offsetX=0.
|
||
|
|
for i in range(0,numX):
|
||
|
|
offsetY=0.
|
||
|
|
for j in range(0,numY):
|
||
|
|
if j%2==0:
|
||
|
|
xPos=offsetX
|
||
|
|
else:
|
||
|
|
xPos=offsetX+xLength
|
||
|
|
ParSketch.Line(point1=(xLength+xPos,-yLength+offsetY),point2=(xLength+xPos,yLength+offsetY))
|
||
|
|
ParSketch.Line(point1=(xLength+xPos,+yLength+offsetY),point2=(xPos,2.*yLength+offsetY))
|
||
|
|
ParSketch.Line(point1=(xLength+xPos,-yLength+offsetY),point2=(xPos,-2.*yLength+offsetY))
|
||
|
|
offsetY=offsetY+3.*yLength
|
||
|
|
offsetX=offsetX+2.*xLength
|
||
|
|
elif grainType=='Voronoi':
|
||
|
|
random.seed(randomSeed[eachModel])
|
||
|
|
qhullin=open('qhullin.dat','w')
|
||
|
|
qhullin.write("%i \n"%(2))
|
||
|
|
qhullin.write("%i \n"%(numGrains*9))
|
||
|
|
xlist=[0.]
|
||
|
|
ylist=[0.]
|
||
|
|
#
|
||
|
|
#Generate Point Seeds - Hardcore Voronoi Method Optional
|
||
|
|
for i in range(0,numGrains):
|
||
|
|
outside=False
|
||
|
|
while outside==False:
|
||
|
|
xcor=random.random()*xSize
|
||
|
|
ycor=random.random()*ySize
|
||
|
|
if hardRad==0.:
|
||
|
|
outside=True
|
||
|
|
break
|
||
|
|
if len(xlist)>1:
|
||
|
|
distold=1000.
|
||
|
|
for i in range(1,len(xlist)):
|
||
|
|
distnew=(xcor-xlist[i])*(xcor-xlist[i])+(ycor-ylist[i])*(ycor-ylist[i])
|
||
|
|
distnew=sqrt(distnew)
|
||
|
|
if distnew<distold:
|
||
|
|
distold=distnew
|
||
|
|
if distold>=hardRad:
|
||
|
|
outside=True
|
||
|
|
else:
|
||
|
|
outside=True
|
||
|
|
xlist.append(xcor)
|
||
|
|
ylist.append(ycor)
|
||
|
|
qhullin.write("%18.6f %18.6f \n"%(xcor,ycor))
|
||
|
|
qhullin.write("%18.6f %18.6f \n"%(xcor+xSize,ycor))
|
||
|
|
qhullin.write("%18.6f %18.6f \n"%(xcor-xSize,ycor))
|
||
|
|
qhullin.write("%18.6f %18.6f \n"%(xcor,ycor+ySize))
|
||
|
|
qhullin.write("%18.6f %18.6f \n"%(xcor,ycor-ySize))
|
||
|
|
qhullin.write("%18.6f %18.6f \n"%(xcor+xSize,ycor+ySize))
|
||
|
|
qhullin.write("%18.6f %18.6f \n"%(xcor-xSize,ycor-ySize))
|
||
|
|
qhullin.write("%18.6f %18.6f \n"%(xcor+xSize,ycor-ySize))
|
||
|
|
qhullin.write("%18.6f %18.6f \n"%(xcor-xSize,ycor+ySize))
|
||
|
|
qhullin.close()
|
||
|
|
#
|
||
|
|
# Generate tesselation externally and post-process results
|
||
|
|
scales=open('scales.dat','w')
|
||
|
|
scales.write("%18.6f %18.6f \n"%(xSize,ySize))
|
||
|
|
scales.close()
|
||
|
|
retcode=subprocess.call("qhull.exe v Qbb TI qhullin.dat o TO qhullout.dat")
|
||
|
|
retcode=subprocess.call("Voronoi2DPost.exe")
|
||
|
|
FortranFile=open('fortranout.dat')
|
||
|
|
num_cells=int(FortranFile.readline())
|
||
|
|
cordx=[]
|
||
|
|
cordy=[]
|
||
|
|
x1=[]
|
||
|
|
y1=[]
|
||
|
|
x2=[]
|
||
|
|
y2=[]
|
||
|
|
k=0
|
||
|
|
#
|
||
|
|
# Generate Partition Sketch
|
||
|
|
for i in range(0,num_cells):
|
||
|
|
num_verts=int(FortranFile.readline())
|
||
|
|
for j in range(0,num_verts):
|
||
|
|
coords=FortranFile.readline().split(',')
|
||
|
|
cordx.append([])
|
||
|
|
cordy.append([])
|
||
|
|
cordx[j]=float(coords[0])
|
||
|
|
cordy[j]=float(coords[1])
|
||
|
|
for j in range(0,num_verts-1):
|
||
|
|
ParSketch.Line(point1=(cordx[j],cordy[j]),point2=(cordx[j+1],cordy[j+1]))
|
||
|
|
x1.append([])
|
||
|
|
y1.append([])
|
||
|
|
x1[k]=cordx[j]
|
||
|
|
y1[k]=cordy[j]
|
||
|
|
x2.append([])
|
||
|
|
y2.append([])
|
||
|
|
x2[k]=cordx[j+1]
|
||
|
|
y2[k]=cordy[j+1]
|
||
|
|
k=k+1
|
||
|
|
ParSketch.Line(point1=(cordx[num_verts-1],cordy[num_verts-1]),
|
||
|
|
point2=(cordx[0],cordy[0]))
|
||
|
|
x1.append([])
|
||
|
|
y1.append([])
|
||
|
|
x1[k]=cordx[num_verts-1]
|
||
|
|
y1[k]=cordy[num_verts-1]
|
||
|
|
x2.append([])
|
||
|
|
y2.append([])
|
||
|
|
x2[k]=cordx[0]
|
||
|
|
y2[k]=cordy[0]
|
||
|
|
k=k+1
|
||
|
|
print i
|
||
|
|
BasePart.PartitionFaceBySketch(faces=BasePart.faces, sketch=ParSketch)
|
||
|
|
#
|
||
|
|
# Generate Sections and Section Assignments
|
||
|
|
labelcount=1
|
||
|
|
regions=BasePart.faces
|
||
|
|
for eachregion in regions:
|
||
|
|
mlabel='Mat'+str(labelcount)
|
||
|
|
VerModel.PEGSection(name=mlabel, material=mlabel, thickness=0.01,
|
||
|
|
wedgeAngle1=0.0, wedgeAngle2=0.0)
|
||
|
|
BasePart.SectionAssignment(region=(eachregion,),
|
||
|
|
sectionName=mlabel, offset=0.0, offsetField='')
|
||
|
|
labelcount=labelcount+1
|
||
|
|
#
|
||
|
|
# Mesh Part
|
||
|
|
BasePart.ReferencePoint(point=(0.0, 0.0, 0.0))
|
||
|
|
if grainType=='Square':
|
||
|
|
BasePart.setMeshControls(regions=BasePart.faces, elemShape=QUAD, technique=STRUCTURED)
|
||
|
|
elif grainType=='Hexagon':
|
||
|
|
offsetX=0.
|
||
|
|
offsetY=0.
|
||
|
|
ParSketch2=VerModel.ConstrainedSketch(name='Hex',sheetSize=200, transform=partTransform)
|
||
|
|
for i in range(0,2*numX):
|
||
|
|
ParSketch2.Line(point1=(offsetX,0.),point2=(offsetX,2.*charLength*numY))
|
||
|
|
offsetX=offsetX+xLength
|
||
|
|
for i in range(0,numY):
|
||
|
|
ParSketch2.Line(point1=(0.,offsetY),point2=(2.*charLength*numX,offsetY))
|
||
|
|
offsetY=offsetY+3.*yLength
|
||
|
|
BasePart.PartitionFaceBySketch(faces=BasePart.faces, sketch=ParSketch2)
|
||
|
|
BasePart.setMeshControls(regions=BasePart.faces, elemShape=QUAD, technique=SWEEP)
|
||
|
|
elif grainType=='Voronoi':
|
||
|
|
BasePart.setMeshControls(regions=BasePart.faces, elemShape=QUAD_DOMINATED, technique=FREE)
|
||
|
|
BasePart.seedPart(size=meshSize)
|
||
|
|
pickedRegions =(BasePart.faces, )
|
||
|
|
elemType1 = mesh.ElemType(elemCode=CPEG8R, elemLibrary=STANDARD)
|
||
|
|
#elemType1 = mesh.ElemType(elemCode=CPEG4R, elemLibrary=STANDARD,hourglassControl=ENHANCED)
|
||
|
|
BasePart.setElementType(regions=pickedRegions, elemTypes=(elemType1,))
|
||
|
|
BasePart.generateMesh()
|
||
|
|
#
|
||
|
|
#Steps
|
||
|
|
VerModel.StaticStep(name='Step-1', previous='Initial',
|
||
|
|
maxNumInc=100000, initialInc=0.03, minInc=1e-07, maxInc=0.15, nlgeom=ON, timePeriod=20.)
|
||
|
|
VerModel.fieldOutputRequests['F-Output-1'].setValues(variables=(
|
||
|
|
'LE', 'RF', 'S', 'U'), timeInterval=0.2, timeMarks=OFF)
|
||
|
|
#
|
||
|
|
#Boundary Conditions
|
||
|
|
VerAssembly.Instance(name='Strut',part=BasePart, dependent=ON)
|
||
|
|
iNodes=VerAssembly.instances['Strut'].nodes
|
||
|
|
toler=0.01*meshSize
|
||
|
|
Left=iNodes.getByBoundingBox(xMin=-toler,xMax=toler,yMin=-toler,yMax=ySize+toler)
|
||
|
|
BLeft=iNodes.getByBoundingBox(xMin=-toler,xMax=toler,yMin=-toler,yMax=toler)
|
||
|
|
Right=iNodes.getByBoundingBox(xMin=xSize-toler,xMax=xSize+toler,yMin=toler,yMax=ySize+toler)
|
||
|
|
BRight=iNodes.getByBoundingBox(xMin=xSize-toler,xMax=xSize+toler,yMin=-toler,yMax=toler)
|
||
|
|
#
|
||
|
|
Lregion=regionToolset.Region(nodes=Left)
|
||
|
|
BLregion=regionToolset.Region(nodes=BLeft)
|
||
|
|
Rregion=regionToolset.Region(nodes=Right)
|
||
|
|
BRregion=regionToolset.Region(nodes=BRight)
|
||
|
|
#
|
||
|
|
VerModel.SmoothStepAmplitude(name='Amp-1', timeSpan=TOTAL, data=(( 0.0, 0.0), (24.00, 1.0)))
|
||
|
|
VerModel.DisplacementBC(name='LeftX', createStepName='Initial',
|
||
|
|
region=Lregion, u1=0.0, u2=UNSET, u3=UNSET, ur1=UNSET, ur2=UNSET,
|
||
|
|
ur3=UNSET, amplitude=UNSET, fixed=OFF, distributionType=UNIFORM)
|
||
|
|
VerModel.DisplacementBC(name='BottomY1', createStepName='Initial',
|
||
|
|
region=BLregion, u1=UNSET, u2=0.0, u3=UNSET, ur1=UNSET, ur2=UNSET,
|
||
|
|
ur3=UNSET, amplitude=UNSET, fixed=OFF, distributionType=UNIFORM)
|
||
|
|
if analysis=='Tension':
|
||
|
|
VerModel.DisplacementBC(name='Tension', createStepName='Step-1',
|
||
|
|
region=BRregion, u1=0.5*xSize, u2=UNSET, u3=UNSET, ur1=UNSET, ur2=UNSET,
|
||
|
|
ur3=UNSET, amplitude=UNSET, fixed=OFF, distributionType=UNIFORM)
|
||
|
|
VerModel.DisplacementBC(name='BottomY2', createStepName='Initial',
|
||
|
|
region=BRregion, u1=UNSET, u2=0.0, u3=UNSET, ur1=UNSET, ur2=UNSET,
|
||
|
|
ur3=UNSET, amplitude=UNSET, fixed=OFF, distributionType=UNIFORM)
|
||
|
|
VerModel.boundaryConditions['Tension'].setValues(amplitude='Amp-1')
|
||
|
|
else:
|
||
|
|
VerModel.DisplacementBC(name='Bending', createStepName='Step-1',
|
||
|
|
region=BRregion, u1=UNSET, u2=UNSET, u3=UNSET, ur1=UNSET, ur2=UNSET,
|
||
|
|
ur3=-6., amplitude=UNSET, fixed=OFF, distributionType=UNIFORM)
|
||
|
|
VerModel.boundaryConditions['Bending'].setValues(amplitude='Amp-1')
|
||
|
|
#
|
||
|
|
VerAssembly.Set(nodes=Right, name='Right')
|
||
|
|
VerAssembly.Set(nodes=BRight, name='BRight')
|
||
|
|
if analysis=='Tension':
|
||
|
|
VerModel.Equation(name='Constraint-1', terms=((1.0, 'Right', 1), ( -1.0, 'BRight', 1)))
|
||
|
|
else:
|
||
|
|
region1=VerAssembly.sets['BRight']
|
||
|
|
region2=VerAssembly.sets['Right']
|
||
|
|
VerModel.MultipointConstraint(name='Constraint-2',
|
||
|
|
controlPoint=region1, surface=region2, mpcType=BEAM_MPC,
|
||
|
|
userMode=DOF_MODE_MPC, userType=0, csys=None)
|
||
|
|
#
|
||
|
|
#Create Job and write input file
|
||
|
|
if grainType=='Square':
|
||
|
|
letter1='S'
|
||
|
|
elif grainType=='Hexagon':
|
||
|
|
letter1='H'
|
||
|
|
elif grainType=='Voronoi':
|
||
|
|
letter1='V'
|
||
|
|
if analysis=='Tension':
|
||
|
|
letter2='T'
|
||
|
|
else:
|
||
|
|
letter2='B'
|
||
|
|
label='W'+str(numY)+'L'+str(numX)+letter1+letter2+str(eachModel)
|
||
|
|
VerFile.Job(name=label, model='Model-1', type=ANALYSIS,userSubroutine='ucrystal.for')
|
||
|
|
VerFile.jobs[label].writeInput(consistencyChecking=OFF)
|
||
|
|
# VerFile.close()
|