Search found 236 matches
- 09 Dec 2019, 18:48
- Forum: General
- Topic: Solving solid mechanics problems with material plasticity
- Replies: 50
- Views: 30612
Re: Solving solid mechanics problems with material plasticity
Hi, We have updated the devel version of the ElasticSolve module today so that the solver of Elmer can output user-defined state variable fields (with "Output State Variables = True") to a result (vtu) file and then they may be visualized as usual. The way how UMAT variables are created an...
- 29 Nov 2019, 16:33
- Forum: ElmerSolver
- Topic: induction heating by permanent magnets
- Replies: 3
- Views: 2222
Re: induction heating by permanent magnets
I just mention that a term v x curl A has now been implemented into the 2D solver as well (available in the fresh devel version of Elmer).
-- Mika
-- Mika
- 29 Nov 2019, 16:21
- Forum: ElmerSolver
- Topic: Lorentz velocity in MagnetoDynamics2D
- Replies: 2
- Views: 1586
Re: Lorentz velocity in MagnetoDynamics2D
Hi, In the fresh devel version of Elmer there should now be an option to specify a velocity field v (by using the keywords "Lorentz velocity i" in Body Force sections) in order to add the term -sigma * (v x B) = -sigma * (v x curl A) to the 2D equation. Postprocessing via using the solver ...
- 27 Nov 2019, 13:18
- Forum: ElmerSolver
- Topic: Lorentz velocity in MagnetoDynamics2D
- Replies: 2
- Views: 1586
Re: Lorentz velocity in MagnetoDynamics2D
Hi, I try to understand how the simulation has been organized in the sif file. The field "Magnetic flux density" is usually obtained via postprocessing after the solver of MagnetoDynamics2D has produced the primary solution. Do you have two solver sections which both have MagnetoDynamics2D...
- 26 Nov 2019, 19:04
- Forum: General
- Topic: Solving solid mechanics problems with material plasticity
- Replies: 50
- Views: 30612
Re: Solving solid mechanics problems with material plasticity
I checked that the StressSolver and ElasticitySolver give consistent results for small loads. Could there be some difference in the specification of the load for the different software? What is the resultant couple vector you expect to obtain at the fixed end?
-- Mika
-- Mika
- 25 Nov 2019, 12:16
- Forum: General
- Topic: Solving solid mechanics problems with material plasticity
- Replies: 50
- Views: 30612
Re: Solving solid mechanics problems with material plasticity
I made some small changes to your sif files. After that the standard material model and the UMAT version as available from UMATLib give the same results. To have the same Poisson's ratio 1.E-12 the material constants array must be defined for the example implementation of UMATLib as Material Constan...
- 22 Nov 2019, 10:57
- Forum: ElmerGUI
- Topic: Linear Elasticity Solver - Edge Loads
- Replies: 7
- Views: 4812
Re: Linear Elasticity Solver - Edge Loads
Hi, It should be possible to give distributed loads on edges if these edges have been identified by group numbers in the mesh file mesh.boundary. In a 3D model one often lists only the faces which make the boundary of the 3D body, but additionally some edges may be listed as well. The keyword "...
- 19 Nov 2019, 17:06
- Forum: General
- Topic: Solving solid mechanics problems with material plasticity
- Replies: 50
- Views: 30612
Re: Solving solid mechanics problems with material plasticity
Elmer utilizes the return values of UMAT to perform (inexact) Newton's iteration, so that a linear system is constructed to obtain the solution increment. In very loose terms I'd say that the returned derivative of (Cauchy) stress response function offers a substitute description for the effect of h...
- 19 Nov 2019, 13:13
- Forum: General
- Topic: Solving solid mechanics problems with material plasticity
- Replies: 50
- Views: 30612
Re: Solving solid mechanics problems with material plasticity
If ElasticSolver finds that a UMAT Subroutine has been specified, it doesn't use the standard keywords to seek for the basic material parameters such as Young's modulus and Poisson's ratio from the sif file. Instead such parameters are expected to be specified by using the keyword Material Constants...
- 19 Nov 2019, 10:54
- Forum: General
- Topic: Solving solid mechanics problems with material plasticity
- Replies: 50
- Views: 30612
Re: Solving solid mechanics problems with material plasticity
Elmer doesn't have any state variables which would be allocated by default. Therefore it's a user's task to specify the count of state variables (the keyword command Number of State Variables = Integer ...) and use them consistently within the user-supplied umat subroutine. In practice, outside the ...