182 lines
6.5 KiB
Python
182 lines
6.5 KiB
Python
# ***************************************************************************
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# * Copyright (c) 2019 Bernd Hahnebach <bernd@bimstatik.org> *
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# * Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com *
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# * *
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# * This file is part of the FreeCAD CAx development system. *
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# * *
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# * This program is free software; you can redistribute it and/or modify *
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# * it under the terms of the GNU Lesser General Public License (LGPL) *
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# * as published by the Free Software Foundation; either version 2 of *
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# * the License, or (at your option) any later version. *
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# * for detail see the LICENCE text file. *
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# * *
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# * This program is distributed in the hope that it will be useful, *
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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# * GNU Library General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Library General Public *
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# * License along with this program; if not, write to the Free Software *
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# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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# * USA *
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# * *
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# ***************************************************************************
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# to run the example use:
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"""
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from femexamples.material_nl_platewithhole import setup
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setup()
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"""
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# Nonlinear material example, plate with hole.
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# https://forum.freecadweb.org/viewtopic.php?f=24&t=31997&start=30
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# https://forum.freecadweb.org/viewtopic.php?t=33974&start=90
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# https://forum.freecadweb.org/viewtopic.php?t=35893
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# https://forum.freecadweb.org/viewtopic.php?t=23101
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# plate: 400x200x10 mm
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# hole: diameter 100 mm (half cross section)
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# load: 130 MPa tension
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# linear material: Steel, E = 210000 MPa, my = 0.3
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# nonlinear material: '240.0, 0.0' to '270.0, 0.025'
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# TODO nonlinear material: give more information, use values from harry
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# TODO compare results with example from HarryvL
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import FreeCAD
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from FreeCAD import Vector as vec
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import Fem
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import ObjectsFem
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import Part
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from Part import makeCircle as ci
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from Part import makeLine as ln
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mesh_name = "Mesh" # needs to be Mesh to work with unit tests
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def init_doc(doc=None):
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if doc is None:
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doc = FreeCAD.newDocument()
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return doc
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def get_information():
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info = {"name": "Material NL Plate with Hole",
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"meshtype": "solid",
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"meshelement": "Tet10",
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"constraints": ["fixed", "force"],
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"solvers": ["ccx"],
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"material": "multimaterial",
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"equation": "mechanical"
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}
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return info
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def setup(doc=None, solvertype="ccxtools"):
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# setup model
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if doc is None:
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doc = init_doc()
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# geometry objects
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v1 = vec(-200, -100, 0)
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v2 = vec(200, -100, 0)
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v3 = vec(200, 100, 0)
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v4 = vec(-200, 100, 0)
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l1 = ln(v1, v2)
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l2 = ln(v2, v3)
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l3 = ln(v3, v4)
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l4 = ln(v4, v1)
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v5 = vec(0, 0, 0)
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c1 = ci(50, v5)
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face = Part.makeFace([Part.Wire([l1, l2, l3, l4]), c1], "Part::FaceMakerBullseye")
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geom_obj = doc.addObject("Part::Feature", "Hole_Plate")
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geom_obj.Shape = face.extrude(vec(0, 0, 10))
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doc.recompute()
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if FreeCAD.GuiUp:
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geom_obj.ViewObject.Document.activeView().viewAxonometric()
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geom_obj.ViewObject.Document.activeView().fitAll()
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# analysis
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analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
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# solver
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if solvertype == "calculix":
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solver = analysis.addObject(
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ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
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)[0]
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elif solvertype == "ccxtools":
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solver = analysis.addObject(
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ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
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)[0]
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solver.WorkingDir = u""
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else:
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FreeCAD.Console.PrintWarning(
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"Not known or not supported solver type: {}. "
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"No solver object was created.\n".format(solvertype)
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)
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if solvertype == "calculix" or solvertype == "ccxtools":
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solver.SplitInputWriter = False
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solver.AnalysisType = "static"
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solver.GeometricalNonlinearity = "linear"
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solver.ThermoMechSteadyState = False
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solver.MatrixSolverType = "default"
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solver.IterationsControlParameterTimeUse = False
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solver.GeometricalNonlinearity = 'nonlinear'
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solver.MaterialNonlinearity = 'nonlinear'
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# linear material
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matprop = {}
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matprop["Name"] = "CalculiX-Steel"
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matprop["YoungsModulus"] = "210000 MPa"
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matprop["PoissonRatio"] = "0.30"
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matprop["Density"] = "7900 kg/m^3"
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material = analysis.addObject(
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ObjectsFem.makeMaterialSolid(doc, "Material_lin")
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)[0]
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material.Material = matprop
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# nonlinear material
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nonlinear_material = analysis.addObject(
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ObjectsFem.makeMaterialMechanicalNonlinear(doc, material, "Material_nonlin")
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)[0]
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nonlinear_material.YieldPoint1 = '240.0, 0.0'
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nonlinear_material.YieldPoint2 = '270.0, 0.025'
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# check solver attributes, Nonlinearity needs to be set to nonlinear
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# fixed_constraint
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fixed_constraint = analysis.addObject(
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ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
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)[0]
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fixed_constraint.References = [(geom_obj, "Face4")]
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# force constraint
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pressure_constraint = doc.Analysis.addObject(
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ObjectsFem.makeConstraintPressure(doc, "ConstraintPressure")
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)[0]
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pressure_constraint.References = [(geom_obj, "Face2")]
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pressure_constraint.Pressure = 130.0
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pressure_constraint.Reversed = True
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# mesh
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from .meshes.mesh_platewithhole_tetra10 import create_nodes, create_elements
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fem_mesh = Fem.FemMesh()
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control = create_nodes(fem_mesh)
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if not control:
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FreeCAD.Console.PrintError("Error on creating nodes.\n")
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control = create_elements(fem_mesh)
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if not control:
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FreeCAD.Console.PrintError("Error on creating elements.\n")
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femmesh_obj = analysis.addObject(
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ObjectsFem.makeMeshGmsh(doc, mesh_name)
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)[0]
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femmesh_obj.FemMesh = fem_mesh
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femmesh_obj.Part = geom_obj
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femmesh_obj.SecondOrderLinear = False
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doc.recompute()
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return doc
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