The whole original input file of chapter 7:
Code language: plaintext (plaintext)*Heading ** plate with hole model, SI units *Preprint, echo=NO, model=NO, history=NO, contact=NO ** *Part, name=plate *Node 1, 0., 5. 2, 0., 20. 3, 0.975451589, 4.90392637 4, 2.7778511, 4.15734816 5, 3.53553391, 3.53553391 6, 4.15734816, 2.7778511 7, 4.90392637, 0.975451589 8, 5., 0. 9, 20., 0. 10, 20., 20. 11, 0., 8.75 12, 0., 12.5 13, 0., 16.25 14, 1.91341722, 4.61939764 15, 4.61939764, 1.91341722 16, 17.8756886, 0. 17, 15.9219751, 0. 18, 14.1251621, 0. 19, 12.4726467, 0. 20, 10.9528408, 0. 21, 9.55508804, 0. 22, 8.26958656, 0. 23, 7.08732033, 0. 24, 6., 0. 25, 20., 16. 26, 20., 12. 27, 20., 8. 28, 20., 4. 29, 4., 20. 30, 8., 20. 31, 12., 20. 32, 16., 20. 33, 4.61048985, 4.27207041 34, 5.21953821, 3.3241663 35, 5.65414333, 2.24666381 36, 3.76305604, 5.0720458 37, 2.9698534, 5.98835516 38, 9.52673054, 1.3621918 39, 10.8648214, 1.28821659 40, 12.2752504, 1.49624527 41, 13.7877016, 1.8428328 42, 15.4558372, 2.21547365 43, 17.4501019, 2.73403955 44, 5.91304588, 1.13274133 45, 4.68926382, 5.76015615 46, 6.4430089, 3.80565119 47, 5.95787334, 5.26839066 48, 6.80666494, 2.51488447 49, 4.42414665, 6.79759693 50, 8.23377609, 1.3453728 51, 9.59390545, 2.90512729 52, 10.7518759, 2.3682847 53, 11.7106466, 2.94118524 54, 14.5212259, 4.29937983 55, 8.08390808, 2.67795062 56, 7.78504944, 3.97590899 57, 7.77411175, 5.33681679 58, 6.10621023, 6.95071125 59, 1.94550073, 7.10477209 60, 11.838357, 5.2793541 61, 7.02121258, 1.25902271 62, 10.0063887, 6.35130978 63, 8.010355, 6.83067751 64, 9.39275265, 4.97939444 65, 6.02029657, 8.60703278 66, 3.87908149, 8.27187824 67, 8.93236446, 3.98667765 68, 8.23227215, 8.46074009 69, 8.32474804, 10.2367725 70, 10.6257029, 8.00327873 71, 16.7049828, 6.19563103 72, 13.6436939, 9.75342178 73, 10.8004723, 10.1224651 74, 5.94967222, 10.5041113 75, 13.4720745, 6.85688591 76, 3.24529791, 13.0592442 77, 8.33017063, 11.9740849 78, 16.8983517, 9.04143524 79, 8.14096928, 15.8777552 80, 16.4028816, 16.3181858 81, 12.5486145, 16.4053078 82, 13.2811871, 13.0176907 83, 16.7287922, 12.6320887 84, 3.71863937, 16.398428 85, 3.26978445, 10.2153568 86, 16.1973763, 4.55466032 87, 13.0253439, 3.65237355 88, 6.37839174, 12.9158268 89, 10.1812487, 12.8076839 90, 10.6965008, 4.08778143 *Element, type=CPS4R 1, 36, 37, 14, 4 2, 4, 5, 33, 36 3, 57, 47, 46, 56 4, 34, 33, 5, 6 5, 6, 15, 35, 34 6, 8, 24, 44, 7 7, 85, 76, 12, 11 8, 37, 59, 3, 14 9, 45, 36, 33, 47 10, 47, 33, 34, 46 11, 9, 28, 43, 16 12, 43, 42, 17, 16 13, 41, 40, 19, 18 14, 40, 39, 20, 19 15, 39, 38, 21, 20 16, 39, 40, 53, 52 17, 46, 34, 35, 48 18, 22, 21, 38, 50 19, 44, 35, 15, 7 20, 25, 10, 32, 80 21, 52, 51, 38, 39 22, 2, 13, 84, 29 23, 77, 88, 74, 69 24, 69, 74, 65, 68 25, 82, 83, 80, 81 26, 45, 47, 58, 49 27, 61, 50, 55, 48 28, 36, 45, 49, 37 29, 1, 3, 59, 11 30, 90, 51, 52, 53 31, 18, 17, 42, 41 32, 87, 41, 42, 54 33, 86, 71, 75, 54 34, 44, 24, 23, 61 35, 23, 22, 50, 61 36, 60, 62, 64, 90 37, 49, 66, 59, 37 38, 35, 44, 61, 48 39, 67, 51, 90, 64 40, 51, 55, 50, 38 41, 48, 55, 56, 46 42, 53, 40, 41, 87 43, 54, 75, 60, 87 44, 71, 86, 43, 28 45, 63, 57, 64, 62 46, 68, 63, 62, 70 47, 58, 47, 57, 63 48, 63, 68, 65, 58 49, 66, 49, 58, 65 50, 66, 65, 74, 85 51, 87, 60, 90, 53 52, 60, 75, 70, 62 53, 68, 70, 73, 69 54, 57, 56, 67, 64 55, 59, 66, 85, 11 56, 67, 56, 55, 51 57, 69, 73, 89, 77 58, 80, 83, 26, 25 59, 29, 84, 79, 30 60, 73, 72, 82, 89 61, 71, 28, 27, 78 62, 75, 71, 78, 72 63, 70, 75, 72, 73 64, 30, 79, 81, 31 65, 76, 85, 74, 88 66, 84, 76, 88, 79 67, 13, 12, 76, 84 68, 89, 82, 81, 79 69, 78, 27, 26, 83 70, 80, 32, 31, 81 71, 83, 82, 72, 78 72, 86, 54, 42, 43 73, 79, 88, 77, 89 *Node 91, 0., 20., 0. *Nset, nset=plate-RefPt_, internal 91, *Nset, nset=RP 91, *Nset, nset=y_sym 8, 9, 16, 17, 18, 19, 20, 21, 22, 23, 24 *Elset, elset=y_sym 6, 11, 12, 13, 14, 15, 18, 31, 34, 35 *Nset, nset=x_sym 1, 2, 11, 12, 13 *Elset, elset=x_sym 7, 22, 29, 67 *Nset, nset=top 2, 10, 29, 30, 31, 32 *Elset, elset=top 20, 22, 59, 64, 70 *Nset, nset=all, generate 1, 90, 1 *Elset, elset=all, generate 1, 73, 1 ** Section: steel *Solid Section, elset=all, material=steel , *End Part ** *Assembly, name=Assembly *Instance, name=plate-1, part=plate *End Instance ** *Surface, type=NODE, name=plate-1_top_CNS_, internal plate-1.top, 1. ** Constraint: couple_top_uy *Coupling, constraint name=couple_top_uy, ref node=plate-1.RP, surface=plate-1_top_CNS_ *Kinematic 2, 2 *End Assembly ** *Material, name=steel *Elastic 210000., 0.3 *Plastic 500.,0. ** ** Name: x_sym Type: Displacement/Rotation *Boundary plate-1.x_sym, 1, 1 ** Name: y_sym Type: Displacement/Rotation *Boundary plate-1.y_sym, 2, 2 ** ---------------------------------------------------------------- *Step, name=pull_y, nlgeom=YES *Static 1., 1., 1e-05, 1. ** *Boundary plate-1.RP, 1, 1 plate-1.RP, 2, 2, 0.08 plate-1.RP, 6, 6 ** *Output, field, variable=PRESELECT *Output, history, variable=PRESELECT ** print node and element results into dat-file *NODE PRINT U, RF, *EL PRINT S, COORD, PEEQ, *End Step
II) The model_plate.py file using functions
# Plate with hole model for Abaqus/Python course, MP, 09-2020
from abaqus import *
from abaqusConstants import *
from caeModules import *
import os
import numpy as np
session.journalOptions.setValues(replayGeometry=COORDINATE,
recoverGeometry=COORDINATE)
DIR0 = os.path.abspath('')
TOL = 1e-6
# Model functions
# ------------------------------------------------------
def make_geometry(model,(b,h,radius),mesh_size):
# draw the sketch
s = model.ConstrainedSketch(name='plate', sheetSize=200.0)
s.ArcByCenterEnds(center=(0,0), point1=(0,radius), point2=(radius,0),
direction=CLOCKWISE)
s.Line(point1=(radius,0), point2=(b/2.,0))
s.Line(point1=(b/2.,0), point2=(b/2.,h/2.))
s.Line(point1=(b/2.,h/2.), point2=(0,h/2.))
s.Line(point1=(0,radius), point2=(0,h/2.))
# create the part
p = model.Part(name='plate', dimensionality=TWO_D_PLANAR, type=DEFORMABLE_BODY)
p.BaseShell(sketch=s)
# create sets, surfaces, and reference point
p.Set(name='all', faces=p.faces[:])
p.Set(name='x_sym', edges=p.edges.getByBoundingBox(xMax=TOL))
p.Set(name='y_sym', edges=p.edges.getByBoundingBox(yMax=TOL))
p.Set(name='top', edges=p.edges.getByBoundingBox(yMin=h/2.-TOL))
rp = p.ReferencePoint(point=(0,h/2,0))
p.Set(name='RP', referencePoints=(p.referencePoints[rp.id],))
# meshing
p.seedPart(size=mesh_size)
p.generateMesh()
return p
def make_sections(model, p, (E,nu,sy)):
# create material, create and assign sketchOptions
mat = model.Material(name='steel')
mat.Elastic(table=((E_steel, nu_steel), ))
mat.Plastic(table=((sy_steel, 0.0), ))
model.HomogeneousSolidSection(name='steel', material='steel', thickness=None)
p.SectionAssignment(region=p.sets['all'], sectionName='steel',
thicknessAssignment=FROM_SECTION)
return
def make_assembly(model,p):
# assembly
a = model.rootAssembly
inst = a.Instance(name='plate-1', part=p, dependent=ON)
# constraint
model.Coupling(name='couple_top', controlPoint=inst.sets['RP'],
surface=inst.sets['top'], influenceRadius=WHOLE_SURFACE,
couplingType=KINEMATIC, u1=OFF, u2=ON, ur3=OFF)
return inst
def make_boundaries(model,inst,uy):
# step and hostory output
step = model.StaticStep(name='pull', previous='Initial', maxNumInc=1000,
initialInc=0.1, minInc=1e-08, maxInc=0.1, nlgeom=ON)
model.HistoryOutputRequest(name='H-Output-2', createStepName='pull',
variables=('U2', 'RF2'), region=inst.sets['RP'])
# boundaries and load
model.DisplacementBC(name='x_sym', createStepName='Initial',
region=inst.sets['x_sym'], u1=0)
model.DisplacementBC(name='y_sym', createStepName='Initial',
region=inst.sets['y_sym'], u2=0)
model.DisplacementBC(name='pull', createStepName='pull',
region=inst.sets['RP'], u1=0, u2=uy, ur3=0)
return
def run_model(model,job_name):
# create and run job
job = mdb.Job(name=job_name, model='Model-1', type=ANALYSIS,
resultsFormat=ODB)
job.submit(consistencyChecking=OFF)
job.waitForCompletion()
return
def evaluate_image(job_name):
# open the odb
odb = session.openOdb(job_name+'.odb')
vp = session.viewports['Viewport: 1']
vp.setValues(displayedObject=odb)
# Change size of viewport (e.g. 300x200 pixel)
vp.restore()
# position of the viwport
vp.setValues(origin=(50,-50))
vp.setValues(width=150, height=200)
# set up in Abaqus Viewer, recorded, and copied here
"""
session.View(name='User-1', nearPlane=24.242, farPlane=39.003, width=7.2278,
height=9.3665, projection=PERSPECTIVE, cameraPosition=(2.5, 5, 31.623),
cameraUpVector=(0, 1, 0), cameraTarget=(2.5, 5, 0),
viewOffsetX=-1.3504, viewOffsetY=0.25069, autoFit=OFF)
# load the defined view
vp.view.setValues(session.views['User-1'])
"""
# for a changing plate size, take an automatic front view
vp.view.setValues(session.views['Front'])
# view the right filed output
vp.odbDisplay.display.setValues(plotState=(CONTOURS_ON_DEF, ))
vp.odbDisplay.setPrimaryVariable(variableLabel='S',
outputPosition=INTEGRATION_POINT,
refinement=(INVARIANT, 'Mises'),)
# change the legend and what is displayed
vp.viewportAnnotationOptions.setValues(legendFont=
'-*-verdana-medium-r-normal-*-*-140-*-*-p-*-*-*')
vp.viewportAnnotationOptions.setValues(triad=OFF, state=OFF,
legendBackgroundStyle=MATCH,annotations=OFF,compass=OFF,
title=OFF)
# print viewport to png file
session.printOptions.setValues(reduceColors=False, vpDecorations=OFF)
session.pngOptions.setValues(imageSize=(1500, 2000))
session.printToFile(fileName=job_name+'_mises', format=PNG,
canvasObjects=(vp,))
odb.close()
return
def evaluate_ho_path(job_name):
# open the odb
odb = session.openOdb(job_name+'.odb')
vp = session.viewports['Viewport: 1']
vp.setValues(displayedObject=odb)
# evaluate the history output
# ------------------------------------------------------
step = odb.steps['pull']
# select the history region with the name starting with 'Node '
hr_rp = [i for i in step.historyRegions.values()
if i.name.startswith('Node ')][0]
# get vertical dispacement and reaction force data
# ((t,u),...), ((t,rf),...)
res_u = np.array(hr_rp.historyOutputs['U2'].data)
res_rf = np.array(hr_rp.historyOutputs['RF2'].data)
# only take the second colum of data and stack those columns
res_u_f = np.column_stack((res_u[:,1],res_rf[:,1]))
# write u-rf data to file
np.savetxt(job_name+'_res_u_f.dat',res_u_f)
# evaluate the stresses along path (y=0)
# ------------------------------------------------------
# create path from coordinates
pth = session.Path(name='Path-1', type=POINT_LIST,
expression=((radius,0,0), (b/2.,0,0)))
# field output to be evaluated along path
vp.odbDisplay.setPrimaryVariable(variableLabel='S',
outputPosition=INTEGRATION_POINT,refinement=(COMPONENT, 'S22'))
# output for 20 eqiuidistant points over path
# shape: path over DEFORMED or UNDEFORMED geometry
n_points = 20
# get vertical stress S22 over X_COORDINATE
xy = session.XYDataFromPath(name='XYData-1', path=pth,
includeIntersections=False, shape=UNDEFORMED,
projectOntoMesh=False, pathStyle=UNIFORM_SPACING,
numIntervals=n_points, projectionTolerance=0,
labelType=X_COORDINATE)
# write results to file
np.savetxt(job_name+'_res_s22_path.dat',xy.data)
odb.close()
return
# one funtion for the whole plate model (create, run, evaluate)
def plate_model(job_name,(b,h,radius),(E,nu,sy),uy,mesh_size):
# check parameters for errors
if radius >= b/2:
raise ValueError('width b too small for hole radius')
if radius >= h/2:
raise ValueError('height h too small for hole radius')
# reset model
Mdb()
model = mdb.models['Model-1']
# make the parts, mesh it and return it
p = make_geometry(model,(b,h,radius),mesh_size)
# make materials and sections
make_sections(model,p,(E,nu,sy))
# make the assembly & constraint
inst = make_assembly(model,p)
# create step and boundaries
make_boundaries(model,inst,uy)
# save the model
mdb.saveAs(job_name)
# run the model
run_model(model,job_name)
# evaluate: create image
evaluate_image(job_name)
# evaluate: history output and path
evaluate_ho_path(job_name)
return model
# parameters for geometry, material, load and mesh (N-mm-s)
# ------------------------------------------------------
b = 16. # width of the plate (mm)
h = 20. # height of the plate (mm)
radius = 4.5 # radius of the hole (mm)
uy = 0.08 # vertical displacement of the top (mm)
E_steel = 210000. # Young's modulus of steel (MPa)
nu_steel = 0.3 # Poisson's ratio of steel (1)
sy_steel = 500. # yield stress of steel (MPa)
mesh_size = 0.3 # edge length of the mesh (mm)
# run the model function
# ------------------------------------------------------
plate_model('plate-test',(b,h,radius),(E_steel,nu_steel,sy_steel),
uy,mesh_size)Code language: Python (python)