{"id":38882,"date":"2019-11-11T10:49:23","date_gmt":"2019-11-11T10:49:23","guid":{"rendered":"\/forum\/forums\/topic\/material-model-selection\/"},"modified":"2019-11-11T10:49:23","modified_gmt":"2019-11-11T10:49:23","slug":"material-model-selection","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/material-model-selection\/","title":{"rendered":"material model selection"},"content":{"rendered":"<p>Hello,<\/p>\n<p><\/p>\n<p>I have to model a hyperelastic material and I have unixial test data based on nominal stress and strain (figure1).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/126bdb0d-9b87-4063-acfd-aa9500effb47\/89797916-a12a-46c6-8500-ab0200c4466f_stress-strain-uniaxial-test-data.jpg?width=690&amp;upscale=false\" alt=\"stress strain experimental uniaxial data\"><\/p>\n<p><\/p>\n<p>Should I take experimental values only starting from 0?<\/p>\n<p><\/p>\n<p>In Ansys there are several models of different orders to be used such as Ogden, Neoo-Hookean, Mooney-Rivlin, Yeoh, how can I decide which one is the most suitable for representing my model? Is the order of these models related in some way to the kind of experimental data I have? (For exemple do uniaxial tests require only 1st order? Biaxial 2nd order and so on?).<\/p>\n<p><\/p>\n<p>I tried to use Ogden 1st order, but I get this curve fitting with a flat line. Do you have any ideas why?<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/126bdb0d-9b87-4063-acfd-aa9500effb47\/76657b90-a709-4ac8-a202-ab0200c530b9_curve-fitting-ogedn-1st-order.jpg?width=690&amp;upscale=false\" alt=\"curve fitting Ogden 1st order uniaxial data\"><\/p>\n<p><\/p>\n<p>To conclude, how can I check if the stress values I get after solving&nbsp; are&nbsp;reliable and consistent with the selected model ?<\/p>\n<p><\/p>\n<p>Thank you&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-38882","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["11061"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["2478"],"_bbp_subscription":["241639"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["38882"],"_bbp_forum_id":["27791"],"_bbp_engagement":["897","167024"],"_bbp_voice_count":["2"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["98381"],"_bbp_last_active_id":["98381"],"_bbp_last_active_time":["2019-11-13 15:52:20"]},"test":"nyla"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/38882","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\/38882\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=38882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}