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## Re: [Getfem-users] 2d plane strain/stress analysis

 From: Renard Yves Subject: Re: [Getfem-users] 2d plane strain/stress analysis Date: Sat, 13 Mar 2010 11:14:40 +0100 User-agent: Dynamic Internet Messaging Program (DIMP) H3 (1.1.2)

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Dear Umut,

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The problem you have seems to come from the fact that you use a vectorial fem to describes the Lame coefficients lambda and mu. You have to declare a scalar mesh_fem to describe them.
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Concerning your second question, the assembly of the 2d elasticity problem uses Lame coefficients. So you have to set the right Lame coefficients depending if you consider a plane stress model or a plane strain model from the Young modulus and the Poisson ratio.
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Yves.

Umut Tabak <address@hidden> a écrit :

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```Dear all,

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I was wondering when using the asm_stiffness_matrix_for_linear_elasticity function for a 2d problem(on a mesh that is imported from gmsh), I would like to define a 2d vectorial problem(a plane strain or stress one actually). So I set the dimension to 2 since this is a 2s mesh. But when using this method in the format given in the format of the manual
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invalid data mesh fem (Qdim=1 required)

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It has been sometime I have not been using the library, this can be a simple mistake. The second question is that the thickness of the domain in say z direction, is that taken as unit when computing the stiffness matrices? And if I would like to define a different thickness, should I use generic assembly procedure for the beam bending problems. I guess there I can supply this as a parameter to the integration process.
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Simple code is attached.

Best regards,
Umut

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