Hi Guys,
I'm wondering whether the "normal force" changes due to the displacements in the linear elasticity solver? For example if one analyzes the effect of hydrostatic pressure on mechanical structures, it is important to know (in case of big displacements, one might get wrong result).
Best Regards,
Eelis
Linear Elasticity: Normal Force depending on displacement?
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Re: Linear Elasticity: Normal Force depending on displacement?
Hi Eelis
I think that the reference mesh is the initial mesh. Upon request the displacement field is applied after solution but the assembly and hence the normal force are in the referecence configuration. For the nonlinear ElasticSolver the solution affects the direction of the normal.
-Peter
I think that the reference mesh is the initial mesh. Upon request the displacement field is applied after solution but the assembly and hence the normal force are in the referecence configuration. For the nonlinear ElasticSolver the solution affects the direction of the normal.
-Peter
Re: Linear Elasticity: Normal Force depending on displacement?
Thanks Peter!
It seems that in the ElasticSolver only tetraeders and octaeders are available. Are there any richer basis functions for those than linear ones? Is there any way to use the LinearElasticity with the correct orientation of normal force? Or what is the easiest way (since there always is a way )?
Cheers,
Eelis
It seems that in the ElasticSolver only tetraeders and octaeders are available. Are there any richer basis functions for those than linear ones? Is there any way to use the LinearElasticity with the correct orientation of normal force? Or what is the easiest way (since there always is a way )?
Cheers,
Eelis
Re: Linear Elasticity: Normal Force depending on displacement?
Hi,
I just committed a new version of ElasticSolve.src which should enable the use of all classic element types. I think the nonlinear elasticity is the only way to go if the change in the orientation of the surface force vector has to be taken into account.
Best regards,
Mika
I just committed a new version of ElasticSolve.src which should enable the use of all classic element types. I think the nonlinear elasticity is the only way to go if the change in the orientation of the surface force vector has to be taken into account.
Best regards,
Mika
Re: Linear Elasticity: Normal Force depending on displacement?
Thanks a lot Mika! Works like a charm.
Cheers,
Eelis
Cheers,
Eelis
Re: Linear Elasticity: Normal Force depending on displacement?
Hi Mika,mika wrote:Hi,
I just committed a new version of ElasticSolve.src which should enable the use of all classic element types. I think the nonlinear elasticity is the only way to go if the change in the orientation of the surface force vector has to be taken into account.
Best regards,
Mika
Is it possible to handle the plate or shell model in the nonlinear elasticity analysis in elmer?
thanks,
will
Re: Linear Elasticity: Normal Force depending on displacement?
Hi,
If the finite element approximation is based on using piecewise polynomials of degree 2 or higher, the nonlinear elasticity solver could in principle be used for handling shells and plates. However, for very thin bodies the accuracy is expected to be far from optimal. There are certainly better finite element formulations for nonlinear shell problems, but they have not yet been implemented into Elmer.
Best regards,
Mika
If the finite element approximation is based on using piecewise polynomials of degree 2 or higher, the nonlinear elasticity solver could in principle be used for handling shells and plates. However, for very thin bodies the accuracy is expected to be far from optimal. There are certainly better finite element formulations for nonlinear shell problems, but they have not yet been implemented into Elmer.
Best regards,
Mika