{"id":397531,"date":"2024-12-15T15:53:17","date_gmt":"2024-12-15T15:53:17","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/nonlinearity-of-mat_elastic\/"},"modified":"2024-12-15T15:53:17","modified_gmt":"2024-12-15T15:53:17","slug":"nonlinearity-of-mat_elastic","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/nonlinearity-of-mat_elastic\/","title":{"rendered":"Nonlinearity of *MAT_ELASTIC"},"content":{"rendered":"<p>&lt;p&gt;Hello everyone,&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;I am working on a simple explicit model that contains only a cubic body in tension. I used the 4 node tetrahedral mesh (ELFORM=10) and MAT_ELASTIC material model with the default time step control settings. However, when I plotted the Stress-Strain curve from the Force and Displacement values of the model, the curve appeared to be nonlinear. After a closer look at the documentation I found out that MAT_ELASTIC is hypoelastic material model, which might be the reason for this non linear elastic behaviour. Can anyone please suggest a way to achieve linear elastic material behavior in Ls Dyna Explicit? I am having a hard time finding any.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Thanks,&lt;\/p&gt;&lt;p&gt;Shahriar.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/15-12-2024-1734277459-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/attachments.office.net\/owa\/shahria%40clemson.edu\/service.svc\/s\/GetAttachmentThumbnail?id=AAMkAGVlN2JkNTEyLWVhYzUtNDU3ZC1hZjgxLWJlOGVhMjEzM2IzMABGAAAAAAAxGtCruC9bSKfI2VFft9GhBwA3RuF2G%2BcdTqrP78qdLaQXAAAAAAEJAAA3RuF2G%2BcdTqrP78qdLaQXAAB5g8lyAAABEgAQAHwOg7AdF3NHnTBRSzdQ0hU%3D&amp;thumbnailType=2&amp;token=eyJhbGciOiJSUzI1NiIsImtpZCI6IkEzMDVCMkU1Q0ZERjFGQTFBODgyNTU2MzM3NDhCQkNBRTAxNUU5OTIiLCJ0eXAiOiJKV1QiLCJ4NXQiOiJvd1d5NWNfZkg2R29nbFZqTjBpN3l1QVY2WkkifQ.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.Ic46fritI4Eg0THDShF8vo9V9yz0cHBeCete-iVoPbauZRqHeG83fO7F-nBwbx39I1EMb4NrPEmXehzMfk6aoWCEQHQZrMnhRdfIymEej406fv_KTAoPvQmAq8jN15En1UKS23xhNP086Z4vHm6FoNf_HKz-cY48F1uivXpgVCg0ZdJL1TXSBsPfSfTqr-Cforur7rYqD5OfpFwQ-5EhRrk3t2wgLJtxkfg8SmEcqxgJOfe3FcQgpeJ7iF8SGk8vEmhxa3ez-CWYJklDnlzNu7vtc0vxL6cz52ZASDfuL4s7TF_l31ARZB18mBv2DtsoRqRu21T_xCPtXqmZDhYdOg&amp;X-OWA-CANARY=wTQ4TUK9dbsAAAAAAAAAABC9y38fHd0Yd_Qf5Z_Upl_i6vRYh_nmrxC3dA8smAanbDTuZ5nv16k.&amp;owa=outlook.office.com&amp;scriptVer=20241206007.12&amp;clientId=FA2BC532EFEE4BC9AAD5DD746B7D137C&amp;animation=true\" alt=\"Image preview\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-397531","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello everyone, I am working on a simple explicit model that contains only a cubic body in tension. 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