{"id":308056,"date":"2023-09-22T10:16:26","date_gmt":"2023-09-22T10:16:26","guid":{"rendered":"\/forum\/forums\/topic\/hyperelasticity-model\/"},"modified":"2023-09-22T10:16:26","modified_gmt":"2023-09-22T10:16:26","slug":"hyperelasticity-model","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/hyperelasticity-model\/","title":{"rendered":"Hyperelasticity Model"},"content":{"rendered":"

Good afternoon every one. <\/span><\/p>\n

I am working on a FE model in which I would like to reproduce a tensile test of the specimen reported in Figure 1. The material is hyperelastic and the experimental data that I have are the tension and compression test (points of Figure 2). I have settled the material model considering Mooney-Rivlin 9 parameters and the results of the calibration are shown in Figure 2 (it seems that the curve fit follow well the experimental data). <\/span><\/p>\n

<\/p>\n

<\/span><\/p>\n

Figure 1 – Fe model<\/span><\/p>\n

<\/p>\n

<\/span><\/p>\n

Figure 2 – Material model<\/span><\/p>\n

The model is composed by solid element (Solid185). The specimen has been fixed at one section and a force of 100 N has been applied in the other section (figure 3). <\/span><\/p>\n

<\/p>\n

<\/span><\/p>\n

Figure 3 – Load and constraint<\/span><\/p>\n

 <\/span><\/p>\n

The problem is that the solution does not converge (Force criteria is not satisfied . Figure 4) and the errors are reported in figure 5. It seems like there is a lot of element distortion but, as shown in figure 6 and figure 7 (Von Mises and strain plot of the last convergence step) it not seems that there is distortion of those elements. <\/span><\/p>\n

<\/p>\n

<\/span><\/p>\n

Figure 4 – Force convergence plot<\/span><\/p>\n

<\/p>\n

<\/span><\/p>\n

Figure 5 – Errors <\/span><\/p>\n

<\/p>\n

<\/span><\/p>\n

Figure 6 – Von Mises stress<\/span><\/p>\n

<\/p>\n

<\/span><\/p>\n

Figure 7 – Normal elastic strain<\/span><\/p>\n

I tried to understand what could be the problem but I don’t find any solution. I really appreciate any suggestion. <\/span><\/p>\n

Thank you <\/span><\/p>\n

 <\/span><\/p>\n","protected":false},"template":"","class_list":["post-308056","topic","type-topic","status-closed","hentry","topic-tag-hyperplastic","topic-tag-structures"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["260444","275204","296140"],"_bbp_author_ip":["96.7.218.223"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["539"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["308056"],"_bbp_forum_id":["27791"],"_bbp_engagement":["260444","275204","296140"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["312843"],"_bbp_last_active_id":["312843"],"_bbp_last_active_time":["2023-10-23 13:24:50"]},"test":"giuliodalbello1997gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/308056","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/308056\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=308056"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}