Description
Interface for objects that can be subject to area loads, distributed along UV coordinates of the object.
For instance finite elements like shells, ex.for applied pressure.
#include <ChLoadable.h>
Public Member Functions | |
| virtual void | ComputeNF (const double U, const double V, ChVectorDynamic<> &Qi, double &detJ, const ChVectorDynamic<> &F, ChVectorDynamic<> *state_x, ChVectorDynamic<> *state_w)=0 |
| Evaluate N'*F , where N is some type of shape function evaluated at U,V coordinates of the surface, each ranging in [-1..+1], except if IsTriangleIntegrationNeeded() true. More... | |
| virtual ChVector | ComputeNormal (const double U, const double V)=0 |
| Gets the normal to the surface at the parametric coordinate u,v. More... | |
| virtual bool | IsTriangleIntegrationNeeded () |
| If true, use quadrature over u,v in [0..1] range as triangle area coords (with z=1-u-v) otherwise use default quadrature over u,v in [-1..+1] as rectangular isoparametric coords. | |
 Public Member Functions inherited from chrono::ChLoadable | |
| virtual int | LoadableGet_ndof_x ()=0 |
| Gets the number of DOFs affected by this element (position part) | |
| virtual int | LoadableGet_ndof_w ()=0 |
| Gets the number of DOFs affected by this element (speed part) | |
| virtual void | LoadableGetStateBlock_x (int block_offset, ChState &mD)=0 |
| Gets all the DOFs packed in a single vector (position part) | |
| virtual void | LoadableGetStateBlock_w (int block_offset, ChStateDelta &mD)=0 |
| Gets all the DOFs packed in a single vector (speed part) | |
| virtual void | LoadableStateIncrement (const unsigned int off_x, ChState &x_new, const ChState &x, const unsigned int off_v, const ChStateDelta &Dv)=0 |
| Increment all DOFs using a delta. More... | |
| virtual int | Get_field_ncoords ()=0 |
| Number of coordinates in the interpolated field, ex=3 for a tetrahedron finite element or a cable, = 1 for a thermal problem, etc. | |
| virtual int | GetSubBlocks ()=0 |
| Tell the number of DOFs blocks (ex. =1 for a body, =4 for a tetrahedron, etc.) | |
| virtual unsigned int | GetSubBlockOffset (int nblock)=0 |
| Get the offset of the i-th sub-block of DOFs in global vector. | |
| virtual unsigned int | GetSubBlockSize (int nblock)=0 |
| Get the size of the i-th sub-block of DOFs in global vector. | |
| virtual void | LoadableGetVariables (std::vector< ChVariables * > &mvars)=0 |
| Get the pointers to the contained ChVariables, appending to the mvars vector. | |
Member Function Documentation
◆ ComputeNF()
|
pure virtual |
Evaluate N'*F , where N is some type of shape function evaluated at U,V coordinates of the surface, each ranging in [-1..+1], except if IsTriangleIntegrationNeeded() true.
F is a load, N'*F is the resulting generalized load Returns also det[J] with J=[dx/du,..], that might be useful in gauss quadrature.
- Parameters
-
U parametric coordinate in surface V parametric coordinate in surface Qi Return result of N'*F here detJ Return det[J] here F Input F vector, size is =n. field coords. state_x if != 0, update state (pos. part) to this, then evaluate Q state_w if != 0, update state (speed part) to this, then evaluate Q
Implemented in chrono::fea::ChContactTriangleXYZROT, chrono::fea::ChElementShellReissner4, chrono::fea::ChElementShellBST, chrono::fea::ChElementShellANCF_8, chrono::fea::ChElementShellANCF, chrono::fea::ChContactTriangleXYZ, chrono::fea::ChFaceHexa_8, chrono::fea::ChFaceBrick_9, and chrono::fea::ChFaceTetra_4.
◆ ComputeNormal()
|
pure virtual |
Gets the normal to the surface at the parametric coordinate u,v.
Normal must be considered pointing outside in case the surface is a boundary to a volume.
Implemented in chrono::fea::ChContactTriangleXYZROT, chrono::fea::ChElementShellReissner4, chrono::fea::ChElementShellBST, chrono::fea::ChElementShellANCF_8, chrono::fea::ChElementShellANCF, chrono::fea::ChContactTriangleXYZ, chrono::fea::ChFaceHexa_8, chrono::fea::ChFaceBrick_9, and chrono::fea::ChFaceTetra_4.
The documentation for this class was generated from the following file:
- /builds/uwsbel/chrono/src/chrono/physics/ChLoadable.h
