{"id":235762,"date":"2022-09-20T07:50:25","date_gmt":"2022-09-20T07:50:25","guid":{"rendered":"\/forum\/forums\/topic\/validation-2\/"},"modified":"2022-09-20T07:50:25","modified_gmt":"2022-09-20T07:50:25","slug":"validation-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/validation-2\/","title":{"rendered":"validation"},"content":{"rendered":"<div>Hello everyone,&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>I am trying to validate a model of a honeycomb unit cell with Ansys Mechanical APDL. In order to validate the model, I am trying to calculate the Young and shear modulus and compare them with the analytical equations from the book of Gibson &amp; Ashby.&nbsp;<\/div>\n<div>My model consists of a regular hexagon ( l=h, &theta;=30 ) and I am applying a uniform displacement (seen in the photo below )&nbsp; calculating the reaction force of the nodes at the bottom where the model is constrained and with Hookes law calculating E ( out of plane ).<\/div>\n<div>(degree of freedom of the top nodes have been coupled in the Uy, longitude direction green mark in the model )&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>The results I get from the theoretical equations and the model have a deviation of 20% more or less which they shouldn&#8217;t have.&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>What could possibly be wrong?&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>Thanks a lot!<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/09\/20-09-2022-1663660215-Screenshot 2022-09-19 222755.png\" alt=\"\"><\/div>\n","protected":false},"template":"","class_list":["post-235762","topic","type-topic","status-closed","hentry","topic-tag-ansysworkbench-ansys-staticstructural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["263387","88"],"_bbp_author_ip":["96.7.74.191"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["454"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["235762"],"_bbp_forum_id":["27784"],"_bbp_engagement":["88","263387"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["236037"],"_bbp_last_active_id":["236037"],"_bbp_last_active_time":["2022-09-22 11:28:09"]},"test":"up1057819upnet-gr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/235762","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\/235762\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=235762"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}