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QuadBendingFEMForceField

Bending Quad finite elements

Vec3d

Templates:

  • Vec3d

Target: Sofa.Component.SolidMechanics.FEM.Elastic

namespace: sofa::component::solidmechanics::fem::elastic

parents:

  • ForceField

Data

Name Description Default value
name object name unnamed
printLog if true, emits extra messages at runtime. 0
tags list of the subsets the object belongs to
bbox this object bounding box
componentState The state of the component among (Dirty, Valid, Undefined, Loading, Invalid). Undefined
listening if true, handle the events, otherwise ignore the events 0
rayleighStiffness Rayleigh damping - stiffness matrix coefficient 0
quadInfo Internal quad data
vertexInfo Internal point data
edgeInfo Internal edge data
method large: large displacements, small: small displacements small
poissonRatio Poisson ratio in Hooke's law (vector) 0.45
youngModulus Young modulus in Hooke's law (vector) 1000
thickness Thickness of the elements 1
Name Description Destination type name
context Graph Node containing this object (or BaseContext::getDefault() if no graph is used) BaseContext
slaves Sub-objects used internally by this object BaseObject
master nullptr for regular objects, or master object for which this object is one sub-objects BaseObject
mechanicalStates List of mechanical states to which this component is associated BaseMechanicalState
mstate MechanicalState used by this component MechanicalState<Vec3d>
topology link to the topology container BaseMeshTopology

Examples

QuadBendingFEMForceField.scn

<!-- Mechanical QuadbendingFEMForceField Example -->
<Node name="root" gravity="-1 0 0" dt="0.02">
    <RequiredPlugin name="Sofa.Component.Collision.Detection.Algorithm"/> <!-- Needed to use components [BVHNarrowPhase BruteForceBroadPhase CollisionPipeline] -->
    <RequiredPlugin name="Sofa.Component.Collision.Detection.Intersection"/> <!-- Needed to use components [MinProximityIntersection] -->
    <RequiredPlugin name="Sofa.Component.Collision.Response.Contact"/> <!-- Needed to use components [CollisionResponse] -->
    <RequiredPlugin name="Sofa.Component.Constraint.Projective"/> <!-- Needed to use components [FixedProjectiveConstraint] -->
    <RequiredPlugin name="Sofa.Component.IO.Mesh"/> <!-- Needed to use components [MeshVTKLoader] -->
    <RequiredPlugin name="Sofa.Component.LinearSolver.Iterative"/> <!-- Needed to use components [CGLinearSolver] -->
    <RequiredPlugin name="Sofa.Component.Mapping.Linear"/> <!-- Needed to use components [IdentityMapping] -->
    <RequiredPlugin name="Sofa.Component.Mass"/> <!-- Needed to use components [DiagonalMass] -->
    <RequiredPlugin name="Sofa.Component.ODESolver.Backward"/> <!-- Needed to use components [EulerImplicitSolver] -->
    <RequiredPlugin name="Sofa.Component.SolidMechanics.FEM.Elastic"/> <!-- Needed to use components [QuadBendingFEMForceField] -->
    <RequiredPlugin name="Sofa.Component.StateContainer"/> <!-- Needed to use components [MechanicalObject] -->
    <RequiredPlugin name="Sofa.Component.Topology.Container.Dynamic"/> <!-- Needed to use components [QuadSetGeometryAlgorithms QuadSetTopologyContainer QuadSetTopologyModifier] -->
    <RequiredPlugin name="Sofa.Component.Visual"/> <!-- Needed to use components [VisualStyle] -->
    <RequiredPlugin name="Sofa.GL.Component.Rendering3D"/> <!-- Needed to use components [OglModel] -->

    <DefaultAnimationLoop/>
    <VisualStyle displayFlags="showVisual showForceFields showBehaviorModels" />
    <CollisionPipeline name="CollisionPipeline" verbose="0" />
    <BruteForceBroadPhase/>
    <BVHNarrowPhase/>
    <CollisionResponse name="collision response" response="PenalityContactForceField" />
    <MinProximityIntersection name="proximity" alarmDistance="0.5" contactDistance="0.33"/>

    <Node name="skin" gravity="0 0 -9.81">
        <EulerImplicitSolver name="cg_odesolver" />
        <CGLinearSolver iterations="25" name="linear solver" tolerance="1.0e-9" threshold="1.0e-9" />
        <MeshVTKLoader filename="mesh/test_quad.vtk" name="loader" />
        <MechanicalObject template="Vec3" src="@loader" name="DOFs" />
        <QuadSetTopologyContainer src="@loader" name="topology" />
        <QuadSetTopologyModifier name="Modifier" />
        <QuadSetGeometryAlgorithms name="GeomAlgo" template="Vec3" />
        <DiagonalMass massDensity="0.5" name="mass" />

        <QuadBendingFEMForceField name="FEM" youngModulus="2000" poissonRatio="0.49" thickness="0.5" method="small" />

        <FixedProjectiveConstraint indices="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58" />

        <Node name="Visual">
            <OglModel name="Visual" color="yellow" />
            <IdentityMapping template="Vec3,Vec3" name="visualMapping" input="@../DOFs" output="@Visual" />
        </Node>
    </Node>
</Node>

def createScene(root_node):

   root = root_node.addChild('root', gravity="-1 0 0", dt="0.02")

   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Detection.Algorithm")
   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Detection.Intersection")
   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Response.Contact")
   root.addObject('RequiredPlugin', name="Sofa.Component.Constraint.Projective")
   root.addObject('RequiredPlugin', name="Sofa.Component.IO.Mesh")
   root.addObject('RequiredPlugin', name="Sofa.Component.LinearSolver.Iterative")
   root.addObject('RequiredPlugin', name="Sofa.Component.Mapping.Linear")
   root.addObject('RequiredPlugin', name="Sofa.Component.Mass")
   root.addObject('RequiredPlugin', name="Sofa.Component.ODESolver.Backward")
   root.addObject('RequiredPlugin', name="Sofa.Component.SolidMechanics.FEM.Elastic")
   root.addObject('RequiredPlugin', name="Sofa.Component.StateContainer")
   root.addObject('RequiredPlugin', name="Sofa.Component.Topology.Container.Dynamic")
   root.addObject('RequiredPlugin', name="Sofa.Component.Visual")
   root.addObject('RequiredPlugin', name="Sofa.GL.Component.Rendering3D")
   root.addObject('DefaultAnimationLoop', )
   root.addObject('VisualStyle', displayFlags="showVisual showForceFields showBehaviorModels")
   root.addObject('CollisionPipeline', name="CollisionPipeline", verbose="0")
   root.addObject('BruteForceBroadPhase', )
   root.addObject('BVHNarrowPhase', )
   root.addObject('CollisionResponse', name="collision response", response="PenalityContactForceField")
   root.addObject('MinProximityIntersection', name="proximity", alarmDistance="0.5", contactDistance="0.33")

   skin = root.addChild('skin', gravity="0 0 -9.81")

   skin.addObject('EulerImplicitSolver', name="cg_odesolver")
   skin.addObject('CGLinearSolver', iterations="25", name="linear solver", tolerance="1.0e-9", threshold="1.0e-9")
   skin.addObject('MeshVTKLoader', filename="mesh/test_quad.vtk", name="loader")
   skin.addObject('MechanicalObject', template="Vec3", src="@loader", name="DOFs")
   skin.addObject('QuadSetTopologyContainer', src="@loader", name="topology")
   skin.addObject('QuadSetTopologyModifier', name="Modifier")
   skin.addObject('QuadSetGeometryAlgorithms', name="GeomAlgo", template="Vec3")
   skin.addObject('DiagonalMass', massDensity="0.5", name="mass")
   skin.addObject('QuadBendingFEMForceField', name="FEM", youngModulus="2000", poissonRatio="0.49", thickness="0.5", method="small")
   skin.addObject('FixedProjectiveConstraint', indices="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58")

   visual = skin.addChild('Visual')

   visual.addObject('OglModel', name="Visual", color="yellow")
   visual.addObject('IdentityMapping', template="Vec3,Vec3", name="visualMapping", input="@../DOFs", output="@Visual")