chrono::fea::ChElementBeam Class Referenceabstract
Description
Base class for most structural elements of 'beam' type.
#include <ChElementBeam.h>
Inheritance diagram for chrono::fea::ChElementBeam:
Collaboration diagram for chrono::fea::ChElementBeam:
Public Member Functions | |
| virtual void | EvaluateSectionDisplacement (const double eta, ChVector<> &u_displ, ChVector<> &u_rotaz)=0 |
| Gets the xyz displacement of a point on the beam line, and the rotation RxRyRz of section plane, at abscissa 'eta'. More... | |
| virtual void | EvaluateSectionFrame (const double eta, ChVector<> &point, ChQuaternion<> &rot)=0 |
| Gets the absolute xyz position of a point on the beam line, and the absolute rotation of section plane, at abscissa 'eta'. More... | |
| virtual void | EvaluateSectionForceTorque (const double eta, ChVector<> &Fforce, ChVector<> &Mtorque)=0 |
| Gets the force (traction x, shear y, shear z) and the torque (torsion on x, bending on y, on bending on z) at a section along the beam line, at abscissa 'eta'. More... | |
| virtual void | EvaluateSectionStrain (const double eta, ChVector<> &StrainV)=0 |
| Gets the axial and bending strain of the ANCF "cable" element. | |
| double | GetMass () |
| The full mass of the beam, (with const. section, density, etc.) | |
| double | GetRestLength () |
| The rest length of the bar. | |
| void | SetRestLength (double ml) |
| Set the rest length of the bar (usually this should be automatically done when SetupInitial is called on beams element, given the current state, but one might need to override this, ex for precompressed beams etc). | |
 Public Member Functions inherited from chrono::fea::ChElementGeneric | |
| ChKblockGeneric & | Kstiffness () |
| Access the proxy to stiffness, for sparse solver. | |
| virtual void | EleIntLoadResidual_F (ChVectorDynamic<> &R, const double c) override |
| (This is a default (a bit unoptimal) book keeping so that in children classes you can avoid implementing this EleIntLoadResidual_F function, unless you need faster code) | |
| virtual void | EleIntLoadResidual_Mv (ChVectorDynamic<> &R, const ChVectorDynamic<> &w, const double c) override |
| (This is a default (VERY UNOPTIMAL) book keeping so that in children classes you can avoid implementing this EleIntLoadResidual_Mv function, unless you need faster code.) | |
| virtual void | EleIntLoadResidual_F_gravity (ChVectorDynamic<> &R, const ChVector<> &G_acc, const double c) override |
| (This is a default (VERY UNOPTIMAL) book keeping so that in children classes you can avoid implementing this EleIntLoadResidual_F_gravity function, unless you need faster code. More... | |
| virtual void | ComputeGravityForces (ChVectorDynamic<> &Fg, const ChVector<> &G_acc) override |
| (This is the default implementation (POTENTIALLY INEFFICIENT) so that in children classes you can avoid implementing this ComputeGravityForces() function, unless you need faster code.) This fallback implementation uses a temp ChLoaderGravity that applies the load to elements only if they are inherited by ChLoadableUVW so it can use GetDensity() and Gauss quadrature. | |
| virtual void | ComputeMmatrixGlobal (ChMatrixRef M) override |
| Returns the global mass matrix. More... | |
| virtual void | InjectKRMmatrices (ChSystemDescriptor &mdescriptor) override |
| Tell to a system descriptor that there are item(s) of type ChKblock in this object (for further passing it to a solver) | |
| virtual void | KRMmatricesLoad (double Kfactor, double Rfactor, double Mfactor) override |
| Adds the current stiffness K and damping R and mass M matrices in encapsulated ChKblock item(s), if any. More... | |
| virtual void | VariablesFbLoadInternalForces (double factor=1.) override |
| Adds the internal forces, expressed as nodal forces, into the encapsulated ChVariables, in the 'fb' part: qf+=forces*factor (This is a default (a bit unoptimal) book keeping so that in children classes you can avoid implementing this VariablesFbLoadInternalForces function, unless you need faster code) | |
| virtual void | VariablesFbIncrementMq () override |
| Adds M*q (internal masses multiplied current 'qb') to Fb, ex. More... | |
| Public Member Functions inherited from chrono::fea::ChElementBase | |
| virtual int | GetNnodes ()=0 |
| Gets the number of nodes used by this element. | |
| virtual int | GetNdofs ()=0 |
| Gets the number of coordinates in the field used by the referenced nodes. More... | |
| virtual int | GetNodeNdofs (int n)=0 |
| Get the number of coordinates from the n-th node that are used by this element. More... | |
| virtual std::shared_ptr< ChNodeFEAbase > | GetNodeN (int n)=0 |
| Access the nth node. | |
| virtual void | GetStateBlock (ChVectorDynamic<> &mD)=0 |
| Fills the D vector with the current field values at the nodes of the element, with proper ordering. More... | |
| virtual void | ComputeNodalMass () |
| Compute element's nodal masses. | |
| virtual void | ComputeKRMmatricesGlobal (ChMatrixRef H, double Kfactor, double Rfactor=0, double Mfactor=0)=0 |
| Sets H as the stiffness matrix K, scaled by Kfactor. More... | |
| virtual void | ComputeInternalForces (ChVectorDynamic<> &Fi)=0 |
| Computes the internal forces (ex. More... | |
| virtual void | Update () |
| Update: this is called at least at each time step. More... | |
| virtual void | EleDoIntegration () |
| This is optionally implemented if there is some internal state that requires integration. | |
Protected Attributes | |
| double | mass |
| double | length |
| Protected Attributes inherited from chrono::fea::ChElementGeneric | |
| ChKblockGeneric | Kmatr |
Member Function Documentation
◆ EvaluateSectionDisplacement()
|
pure virtual |
Gets the xyz displacement of a point on the beam line, and the rotation RxRyRz of section plane, at abscissa 'eta'.
Note, eta=-1 at node1, eta=+1 at node2.
Implemented in chrono::fea::ChElementBeamANCF, chrono::fea::ChElementBeamEuler, chrono::fea::ChElementBeamIGA, and chrono::fea::ChElementCableANCF.
◆ EvaluateSectionForceTorque()
|
pure virtual |
Gets the force (traction x, shear y, shear z) and the torque (torsion on x, bending on y, on bending on z) at a section along the beam line, at abscissa 'eta'.
Note, eta=-1 at node1, eta=+1 at node2. Results are not corotated, and are expressed in the reference system of beam.
Implemented in chrono::fea::ChElementBeamIGA, chrono::fea::ChElementBeamEuler, and chrono::fea::ChElementCableANCF.
◆ EvaluateSectionFrame()
|
pure virtual |
Gets the absolute xyz position of a point on the beam line, and the absolute rotation of section plane, at abscissa 'eta'.
Note, eta=-1 at node1, eta=+1 at node2.
Implemented in chrono::fea::ChElementBeamANCF, chrono::fea::ChElementBeamIGA, chrono::fea::ChElementBeamEuler, and chrono::fea::ChElementCableANCF.
The documentation for this class was generated from the following file:
- /builds/uwsbel/chrono/src/chrono/fea/ChElementBeam.h
