{"id":359188,"date":"2024-03-26T23:21:37","date_gmt":"2024-03-26T23:21:37","guid":{"rendered":"\/forum\/forums\/reply\/359188\/"},"modified":"2024-03-26T23:21:37","modified_gmt":"2024-03-26T23:21:37","slug":"359188","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/359188\/","title":{"rendered":"Reply To: Ls-Dyna model total stiffness"},"content":{"rendered":"<p>&lt;p&gt;Hello Fady,&lt;\/p&gt;&lt;p&gt;How would you get the total stiffness of the system experimentally? You could put the system in a press and get the stiffness in compression. Or you could put the system in a a tension test machine and get the total stiffness in tension. You can model this test with LS-DYNA and extract the force required to compress or extend the system along with the displacement. You can get the force from the *BOUNDARY_PRESCRIBED_MOTION (bndout) or the contact (rcforc) and the displacement at a node on the press (or extension machine). Then, you can plot the Force vs displacement curve and calculate the stiffness.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Let me know how it goes.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Reno.&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-359188","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/359188","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/359188\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=359188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}