{"id":390277,"date":"2024-10-17T15:42:31","date_gmt":"2024-10-17T15:42:31","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/apply-prestress-with-the-inistate-command-for-a-hyperelastic-material-yeoh\/"},"modified":"2024-10-17T15:42:31","modified_gmt":"2024-10-17T15:42:31","slug":"apply-prestress-with-the-inistate-command-for-a-hyperelastic-material-yeoh","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/apply-prestress-with-the-inistate-command-for-a-hyperelastic-material-yeoh\/","title":{"rendered":"Apply prestress with the inistate command, for a hyperelastic material (Yeoh)"},"content":{"rendered":"<p>&lt;p&gt;Hello, I would like to run 2 simulations:&nbsp;&lt;br&gt;The 1st (left figure) is a simulation of a hyperelastic model (Yeoh of order 2) in large deformations (<em>nlgeom, on<\/em>) of a simple beam with tetrahedral elements attached at one end and subjected to gravity. I&#8217;d like to record the internal stresses generated using the <em>inistate, write<\/em> command. Is this possible for large deformations?&lt;\/p&gt;&lt;p&gt;If so, I&#8217;d like to run a 2nd simulation (right figure). The geometry and boundary conditions are the same as before, but gravity is removed. Instead, we apply the prestress written in the 1st simulation with the <em>inistate, read<\/em> command to all the mesh nodes. If C10 is very high, this simulation converges (as shown on the right). But the displacement values of the 2 simulations are not the same, why?&lt;\/p&gt;&lt;p&gt;However, I&#8217;d like it to be lower, as my material is soft. In this case, the simulation no longer converges. Do you have any solutions for improving the convergence of the solution?&lt;\/p&gt;&lt;p&gt;Is it possible to use the <em>inistate, write<\/em> and <em>inistate, read<\/em> commands for a material in large deformation (<em>nlgeom, on<\/em>) which is non-linear (Yeoh of order 2)?&lt;\/p&gt;&lt;p&gt;Thank you for your answers,&lt;br&gt;Charlotte.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/17-10-2024-1729179387-big_C10.jpg\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-390277","topic","type-topic","status-publish","hentry","topic-tag-hyperelastic","topic-tag-inistate","topic-tag-prestress"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello, I would like to run 2 simulations: The 1st (left figure) is a simulation of a hyperelastic model (Yeoh of order 2) in large deformations (nlgeom, on) of a simple beam with tetrahedral elements attached at one end and subjected to gravity. 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