218 lines
7.9 KiB
Python
218 lines
7.9 KiB
Python
# ***************************************************************************
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# * Copyright (c) 2020 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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import FreeCAD
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import Part
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from BOPTools import SplitFeatures
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import Fem
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import ObjectsFem
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from . import manager
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from .manager import get_meshname
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from .manager import init_doc
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def get_information():
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return {
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"name": "Constraint Contact Shell Shell",
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"meshtype": "face",
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"meshelement": "Tria3",
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"constraints": ["fixed", "force", "contact"],
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"solvers": ["ccxtools"],
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"material": "solid",
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"equations": ["mechanical"],
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}
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def get_explanation(header=""):
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return (
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header
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+ """
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To run the example from Python console use:
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from femexamples.constraint_contact_shell_shell import setup
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setup()
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See forum topic post:
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https://forum.freecad.org/viewtopic.php?f=18&t=42228
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based on https://forum.freecad.org/viewtopic.php?f=18&t=42228#p359488
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contact example shell to shell elements
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"""
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)
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def setup(doc=None, solvertype="ccxtools"):
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# init FreeCAD document
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if doc is None:
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doc = init_doc()
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# explanation object
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# just keep the following line and change text string in get_explanation method
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manager.add_explanation_obj(doc, get_explanation(manager.get_header(get_information())))
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# geometric objects
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# TODO: turn circle of upper tube to have the line on the other side
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# make a boolean fragment of them to be sure there is a mesh point on remesh
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# but as long as we do not remesh it works without the boolean fragment too
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# tubes
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tube_radius = 25
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tube_length = 500
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sh_lower_circle = Part.Wire(Part.makeCircle(tube_radius))
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sh_lower_tube = sh_lower_circle.extrude(FreeCAD.Vector(0, 0, tube_length))
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sh_lower_tube.reverse()
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lower_tube = doc.addObject("Part::Feature", "Lower_tube")
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lower_tube.Shape = sh_lower_tube
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sh_upper_circle = Part.Wire(Part.makeCircle(tube_radius))
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sh_upper_tube = sh_upper_circle.extrude(FreeCAD.Vector(0, 0, tube_length))
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sh_upper_tube.reverse()
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upper_tube = doc.addObject("Part::Feature", "Upper_tube")
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upper_tube.Shape = sh_upper_tube
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upper_tube.Placement = FreeCAD.Placement(
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FreeCAD.Vector(-25, 51, 475),
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FreeCAD.Rotation(90, 0, 90),
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FreeCAD.Vector(0, 0, 0),
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)
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# point for load
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v_force_pt = FreeCAD.Vector(0, 76, 475)
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sh_force_point = Part.Vertex(v_force_pt)
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force_point = doc.addObject("Part::Feature", "Load_place_point")
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force_point.Shape = sh_force_point
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if FreeCAD.GuiUp:
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force_point.ViewObject.PointSize = 10.0
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force_point.ViewObject.PointColor = (1.0, 0.0, 0.0)
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# boolean fragment of upper tubo and force point
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boolfrag = SplitFeatures.makeBooleanFragments(name="BooleanFragments")
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boolfrag.Objects = [upper_tube, force_point]
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if FreeCAD.GuiUp:
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upper_tube.ViewObject.hide()
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# compound out of bool frag and lower tube
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geom_obj = doc.addObject("Part::Compound", "AllGeomCompound")
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geom_obj.Links = [boolfrag, lower_tube]
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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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# line for load direction
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sh_load_line = Part.makeLine(v_force_pt, FreeCAD.Vector(0, 150, 475))
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load_line = doc.addObject("Part::Feature", "Load_direction_line")
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load_line.Shape = sh_load_line
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doc.recompute()
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if FreeCAD.GuiUp:
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load_line.ViewObject.LineWidth = 5.0
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load_line.ViewObject.LineColor = (1.0, 0.0, 0.0)
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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 == "ccxtools":
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solver_obj = ObjectsFem.makeSolverCalculiXCcxTools(doc, "CalculiXCcxTools")
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solver_obj.WorkingDir = ""
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else:
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FreeCAD.Console.PrintWarning(
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"Unknown or unsupported solver type: {}. "
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"No solver object was created.\n".format(solvertype)
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)
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if solvertype == "ccxtools":
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solver_obj.AnalysisType = "static"
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solver_obj.BeamShellResultOutput3D = True
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solver_obj.GeometricalNonlinearity = "linear" # really?
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# TODO iterations parameter !!!
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solver_obj.ThermoMechSteadyState = False
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solver_obj.MatrixSolverType = "default"
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solver_obj.IterationsControlParameterTimeUse = False
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solver_obj.SplitInputWriter = False
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analysis.addObject(solver_obj)
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# shell thickness
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shell_thick = ObjectsFem.makeElementGeometry2D(doc, 0.5, "ShellThickness")
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analysis.addObject(shell_thick)
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# material
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material_obj = ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
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mat = material_obj.Material
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mat["Name"] = "AlCuMgPb"
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mat["YoungsModulus"] = "72000 MPa"
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mat["PoissonRatio"] = "0.30"
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material_obj.Material = mat
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analysis.addObject(material_obj)
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# constraint fixed
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con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
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con_fixed.References = [
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(lower_tube, "Edge2"),
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(upper_tube, "Edge3"),
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]
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analysis.addObject(con_fixed)
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# constraint force
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con_force = ObjectsFem.makeConstraintForce(doc, "ConstraintForce")
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# TODO use point of tube boolean fragment
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con_force.References = [(force_point, "Vertex1")]
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con_force.Force = "5000.0 N"
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con_force.Direction = (load_line, ["Edge1"])
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con_force.Reversed = True
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analysis.addObject(con_force)
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# constraint contact
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con_contact = ObjectsFem.makeConstraintContact(doc, "ConstraintContact")
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con_contact.References = [
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(lower_tube, "Face1"),
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(upper_tube, "Face1"),
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]
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con_contact.Friction = False
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con_contact.Slope = "1000000.0 GPa/m"
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analysis.addObject(con_contact)
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# mesh
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from .meshes.mesh_contact_tube_tube_tria3 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(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
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femmesh_obj.FemMesh = fem_mesh
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femmesh_obj.Shape = 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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