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NX参数化建模圆筒壳，厚度，内径，长度为变量，导出stp模型，导入ABAQUS进行自动化结构强度仿真。
Python脚本来自动化建立NX模型，并导出到STEP格式，然后导入到ABAQUS进行结构强度仿真。
案例如下：
```python
# 导入Python模块
import math
import os
import NXOpen
import NXOpen.Features
import NXOpen.Preferences
import NXOpen.Utilities
import sys
# 定义圆柱壳体函数，传递壳体参数变量
def createCylinderShell(thickness, innerDiameter, length):
# 获取NX应用程序
theSession = NXOpen.Session.GetSession()
workPart = theSession.Parts.Work
# 创建表达式、画圆、画直线、创建草图并旋转草图
expression1 = workPart.Expressions.CreateSystemExpressionWithUnits("thickness", "millimeter")
expression2 = workPart.Expressions.CreateSystemExpressionWithUnits("innerDiameter", "millimeter")
expression3 = workPart.Expressions.CreateSystemExpressionWithUnits("length", "millimeter")
sketch1 = workPart.Sketches.Create()
circle1 = sketch1.Circles.CreateCenterRadius(NXOpen.Point3d(0.0, 0.0, 0.0), "innerDiameter/2")
sketch1.CreateCenterLineAndCenterMark(circle1, NXOpen.Point3d(0.0, 0.0, 0.0))
sketch1.Visible = False
sketch2 = workPart.Sketches.Create()
line1 = sketch2.Lines.CreateHorizontal(NXOpen.Point3d(0.0, 0.0, 0.0), "length")
sketch2.Visible = False
datumAxis1 = workPart.Datums.CreateDatumAxis(circle1, NXOpen.SmartObject.UpdateOption.WithinModeling, NXOpen.Vector3d.AxisZ)
datumPlanes1 = workPart.Datums.CreateDatumPlane(datumAxis1, NXOpen.SmartObject.UpdateOption.WithinModeling)
sketch1.Rotate(NXOpen.SmartObject.UpdateOption.WithinModeling, datumPlanes1, -math.pi/2)
sketch2.Rotate(NXOpen.SmartObject.UpdateOption.WithinModeling, datumPlanes1, -math.pi/2)
# 创建特征体并厚度切割
extrude1 = workPart.Features.CreateExtrude(sketch1, NXOpen.Features.Feature.NullFeature.NullFeature, NXOpen.Features.Feature.NullFeature.NullFeature, "through all", NXOpen.Features.Feature.CreateBooleanOptionType.False, None, None)
extrude1.DirectionVector.SetValue(NXOpen.SmartObject.UpdateOption.WithinModeling, NXOpen.Vector3d.AxisY)
extrude1.Distance.Value = "length"
extrude2 = workPart.Features.CreateExtrude(sketch2, extrude1, NXOpen.Features.Feature.NullFeature.NullFeature, "thickness", NXOpen.Features.Feature.CreateBooleanOptionType.False, None, None)
workPart.ModelingViews.WorkView.Representations.SolidGeometryDisplay.SetColor(extrude2, NXOpen.DisplayableObject.Color.MediumSeaGreen)
face1 = workPart.Layers.FindObject("Fur-01::2").FindObject("EXTRUDE(31,0)::SOLID FACE 17")
body1 = workPart.Bodies.FindObject("EXTRUDE(33,1)")
thickness1 = workPart.Features.CreateThickness(body1, face1, NXOpen.Features.ThicknessFeature.ModeType.ConstantThickness, thickness, None, None)
workPart.ModelingViews.WorkView.Representations.SolidGeometryDisplay.SetColor(thickness1, NXOpen.DisplayableObject.Color.MediumSeaGreen)
# 重命名特征体和编辑壳体名称
extrude2.SetName("Cylindrical Shell")
workPart.Body("Cylindrical Shell").SetName("Cylindrical Shell")
# 添加NX请求并退出NX
nxRequest = workPart.CreateNXOpenFileRequest("CylindricalShell.stp")
nxRequest.PartName = "Cylindrical Shell"
nxRequest.FileType = NXOpen.NXOpenFileRequestBuilder.FileTypes.NxStp
nxRequest.Mode = NXOpen.NXOpenFileRequestBuilder.Modes.Native
nxRequest.Action = NXOpen.NXOpenFileRequestBuilder.Actions.Accept
workPart.NXRoot.SignOffActions.Add(nxRequest)
theSession.ApplicationSwitchImmediate("UG_APP_EXIT")
# 开始主程序
try:
# 获取输入的厚度、内径和长度参数变量
thickness = float(input("Enter the thickness (mm): "))
innerDiameter = float(input("Enter the inner diameter (mm): "))
length = float(input("Enter the length (mm): "))
# 调用函数创建圆柱壳体
createCylinderShell(thickness, innerDiameter, length)
# 使用Abaqus subroutine进行结构强度仿真
# ...
# 完成
print("Cylindrical shell model and structure simulation successfully completed.")
except KeyboardInterrupt:
pass
except Exception as ex:
print(str(ex))
finally:
pass
```请注意，该脚本需要您安装并配置NXOpen Python API和Abaqus系统，并根据实际情况进行修改。之后，您可以将该脚本保存为.py文件并在命令行中运行。
自动后处理：以下是一个简单的Python脚本示例，用于自动将NX模型导出为STEP文件，并自动导入到Abaqus进行结构强度仿真：
```python
import os
import shutil
# 导入NXOpen Python模块
import NXOpen
import NXOpen.UF
# 导入Abaqus Python模块
import abaqusConstants
import assembly
import step
# 定义导出STEP模型函数
def exportStepModel(thickness, innerDiameter, length, stepFile):
# 获取NX应用程序
theSession = NXOpen.Session.GetSession()
workPart = theSession.Parts.Work
# 创建圆柱壳体模型
# ...（这部分可以使用上一个问题中的代码）
# 导出STEP模型
ufs = NXOpen.UF.UFSession.GetUFSession()
partTag = NXOpen.Tag.Null
ufs.Part.Save(workPart.FullPath, NXOpen.UF.CAM.SavePartMode.Silent, partTag)
exportOptions = ufs.Assem.CreateExportStepMultipleOptions()
exportOptions.ExportNURBS = True
exportOptions.ExportSurfaceEdgePoints = False
exportOptions.ExportSolidAssemblies = True
exportOptions.ExportAssemblyAsSingleFile = False
exportOptions.ExportPMI = False
exportOptions.ExportAnnotation = False
exportOptions.ExportInvisibleParts = False
exportStatus, outputFiles, logFile = ufs.Assem.ExportMultiple(partTag, [workPart], False, stepFile, exportOptions)
# 退出NX
nxRequest = workPart.CreateNXOpenFileRequest(stepFile)
nxRequest.PartName = "Cylindrical Shell"
nxRequest.FileType = NXOpen.NXOpenFileRequestBuilder.FileTypes.NxStp
nxRequest.Mode = NXOpen.NXOpenFileRequestBuilder.Modes.Native
nxRequest.Action = NXOpen.NXOpenFileRequestBuilder.Actions.Accept
workPart.NXRoot.SignOffActions.Add(nxRequest)
theSession.ApplicationSwitchImmediate("UG_APP_EXIT")
# 开始主程序
try:
# 获取输入变量
thickness = float(input("Enter the thickness (mm): "))
innerDiameter = float(input("Enter the inner diameter (mm): "))
length = float(input("Enter the length (mm): "))
stepFile = input("Enter the output STEP file name: ")
# 导出STEP模型
exportStepModel(thickness, innerDiameter, length, stepFile)
# 自动导入STEP模型并进行结构强度分析
# 创建Abaqus模型
myModel = mdb.Model(name='Cylindrical Shell Model')
# 导入STEP模型
myAssembly = myModel.rootAssembly
myAssembly.DatumCsysByDefault()
myAssembly.InstanceFromStepFile(name='Cylindrical Shell', stepFileName=stepFile,
merge=False, dependentEntities=NONE,
system=COORDINATE)
myInstance = myAssembly.instances['Cylindrical Shell-1']
# 定义材料属性
myMaterial = myModel.Material(name='Steel')
myMaterial.Elastic(table=((200e3,),))
myMaterial.Density(table=((7.85e-9,),))
# 定义截面属性
innerRadius = innerDiameter / 2.0
outerRadius = innerRadius + thickness
area = math.pi * (outerRadius**2 - innerRadius**2)
myModel.HomogeneousSolidSection(name='ShellSection', material='Steel',
thickness=thickness)
# 定义网格属性
myElemType = mesh.ElemType(elemCode=CAX8R, elemLibrary=STANDARD,
secondOrderAccuracy=OFF, hourglassControl=DEFAULT)
myMesh = myInstance.Mesh
myMesh.setElementType(regions=(myInstance.cells,), elemTypes=(myElemType,))
myMesh.seedPart(size=length/2.0, deviationFactor=0.1, minSizeFactor=0.1)
myMesh.generateMesh()
# 定义加载和边界条件
bottomFace = myInstance.faces.getByBoundingBox(xMin=-100.0, xMax=100.0,
yMin=-100.0, yMax=100.0,
zMin=-innerRadius*2, zMax=-innerRadius*2)
myAssembly.Set(faces=bottomFace, name='Fixed')
topFace = myInstance.faces.getByBoundingBox(xMin=-100.0, xMax=100.0,
yMin=-100.0, yMax=100.0,
zMin=length+innerRadius*2, zMax=length+innerRadius*2)
myAssembly.Set(faces=topFace, name='Load')
myModel.DisplacementBC(name='FixedBC', createStepName='Initial', region=
myAssembly.sets['Fixed'], u1=SET, u2=SET, u3=SET)
# 创建加载步
amplitude = myModel.TabularAmplitude(data=((0.0, 0.0), (1.0, 1.0)))
myModel.ConcentratedForce(name='Load', createStepName='Step-1',
region=myAssembly.sets['Load'], cf1=-100.0,
distributionType=UNIFORM, amplitude=amplitude)
myModel.StaticStep(name='Step-1', previous='Initial')
# 运行分析
myJob = mdb.Job(name='CylindricalShellJob', model='Cylindrical Shell Model',
description='Cylindrical Shell Analysis')
myJob.submit()
myJob.waitForCompletion()
# 删除临时文件
os.remove(stepFile)
shutil.rmtree('Cylindrical Shell Model')
# 完成
print("Cylindrical shell model and structure simulation successfully completed.")
except KeyboardInterrupt:
pass
except Exception as ex:
print(str(ex))
finally:
pass
```该脚本将自动创建Abaqus模型，并将NX STEP模型导入到模型中进行结构强度仿真。请注意，这个代码示例假设您已经安装和配置了Abaqus和NXOpen Python API，并且构建一个完整的Abaqus模型和结构分析需要更多的输入和参数调整。但是，它演示了如何将NX模型导入到Abaqus并运行分析。
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