Description

Face of a linear ChElementHexa_8 hexahedron.

This is a proxy to the hexahedron. It can be used to apply pressure loads. Corner nodes, obtainable with GetNodeN(), are in counterclockwise order seen from the outside.

        v
        ^
3 o-----+-----o 2
  |     |     |
--+-----+-----+-> u
  |     |     |
0 o-----+-----o 1

#include <ChFaceHexa_8.h>

Inheritance diagram for chrono::fea::ChFaceHexa_8:

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Collaboration diagram for chrono::fea::ChFaceHexa_8:

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Public Member Functions
	ChFaceHexa_8 (std::shared_ptr< ChElementHexa_8 > mel, char mid)

std::shared_ptr< ChNodeFEAxyz >	GetNodeN (int i)

void	ShapeFunctions (ChVectorN< double, 4 > &N, double x, double y)
	Fills the N shape function vector (size 4)

virtual int	LoadableGet_ndof_x () override
	Gets the number of DOFs affected by this element (position part)

virtual int	LoadableGet_ndof_w () override
	Gets the number of DOFs affected by this element (speed part)

virtual void	LoadableGetStateBlock_x (int block_offset, ChState &mD) override
	Gets all the DOFs packed in a single vector (position part)

virtual void	LoadableGetStateBlock_w (int block_offset, ChStateDelta &mD) override
	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) override
	Increment all DOFs using a delta.

virtual int	Get_field_ncoords () override
	Number of coordinates in the interpolated field: here the {x,y,z} displacement.

virtual int	GetSubBlocks () override
	Tell the number of DOFs blocks (ex. =1 for a body, =4 for a tetrahedron, etc.)

virtual unsigned int	GetSubBlockOffset (int nblock) override
	Get the offset of the i-th sub-block of DOFs in global vector.

virtual unsigned int	GetSubBlockSize (int nblock) override
	Get the size of the i-th sub-block of DOFs in global vector.

virtual void	LoadableGetVariables (std::vector< ChVariables * > &mvars) override
	Get the pointers to the contained ChVariables, appending to the mvars vector.

virtual void	ComputeNF (const double U, const double V, ChVectorDynamic<> &Qi, double &detJ, const ChVectorDynamic<> &F, ChVectorDynamic<> state_x, ChVectorDynamic<> state_w) override
	Evaluate N'F , where N is some type of shape function evaluated at U,V coordinates of the surface, each ranging in -1..+1 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. More...

virtual bool	IsTriangleIntegrationNeeded () override
	If true, use quadrature over u,v in [0..1] range as triangle volumetric coords Regular quadrature used for this element.

virtual ChVector	ComputeNormal (const double U, const double V) override
	Gets the normal to the surface at the parametric coordinate u,v. More...

Protected Attributes
char	face_id

std::shared_ptr< ChElementHexa_8 >	melement

Member Function Documentation

◆ ComputeNF()

virtual void chrono::fea::ChFaceHexa_8::ComputeNF	(	const double	U,
		const double	V,
		ChVectorDynamic<> &	Qi,
		double &	detJ,
		const ChVectorDynamic<> &	F,
		ChVectorDynamic<> *	state_x,
		ChVectorDynamic<> *	state_w
	)

inlineoverridevirtual

Evaluate N'*F , where N is some type of shape function evaluated at U,V coordinates of the surface, each ranging in -1..+1 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, maybe with offset block_offset
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

Implements chrono::ChLoadableUV.

◆ ComputeNormal()

virtual ChVector chrono::fea::ChFaceHexa_8::ComputeNormal	(	const double	U,
		const double	V
	)

inlineoverridevirtual

Gets the normal to the surface at the parametric coordinate u,v.

Note: the average normal is returned if the face is twisted. Normal must be considered pointing outside in case the surface is a boundary to a volume.

Implements chrono::ChLoadableUV.

The documentation for this class was generated from the following file:

/builds/uwsbel/chrono/src/chrono/fea/ChFaceHexa_8.h

Description

Public Member Functions

Protected Attributes

Member Function Documentation

◆ ComputeNF()

◆ ComputeNormal()