{"id":419386,"date":"2025-02-12T21:48:47","date_gmt":"2025-02-12T21:48:47","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/steady-state-thermal-adhesive-shear-stress-unexpected-results\/"},"modified":"2025-02-12T21:48:47","modified_gmt":"2025-02-12T21:48:47","slug":"steady-state-thermal-adhesive-shear-stress-unexpected-results","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/steady-state-thermal-adhesive-shear-stress-unexpected-results\/","title":{"rendered":"Steady State Thermal &#8211; Adhesive Shear Stress Unexpected Results"},"content":{"rendered":"<p>&lt;p&gt;I have been working on validating adhesive performance under thermal loads and have been seeing unrealistic resultant shear loads on the mating substrates. Referencing Daly and Hawk (2017) or Yoder and Vukabratovich (2015) both utilize some component of mechanical properties of the adhesive and thermal properties of the mating substrate to determine the resultant shear stress of the material, see below. Using 3M&#8217;s 2216 epoxy adhesive material with a bondline thickness of .025in and a bond area of 0.5in x 1in I was expecting to see a resultant shear response around 260psi at temperature, but Ansys was generating a response around 1000psi at temperature; something wasn&#8217;t right. I narrowed down the problem to it being the CTE information defined for the 2216 adhesive. Including the CTE info made the resultant shear load blow up and excluding the information resulted in Ansys generating the expected shear load response of the substrates. I cannot explain this phenomena and why CTE information could give false information &#8212; has anyone experienced anything similar or could explain why Ansys acted the way it did?&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\/2025\/02\/12-02-2025-1739396457-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-419386","topic","type-topic","status-publish","hentry","topic-tag-adhesive","topic-tag-mechanical","topic-tag-steady-state-thermal"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["419386"],"_bbp_subscription":["516119","20905"],"_bbp_author_ip":["150.135.165.84"],"_bbp_last_reply_id":["421636"],"_bbp_last_active_id":["421636"],"_bbp_last_active_time":["2025-02-14 17:04:48"],"_bbp_reply_count":["5"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["516119","20905"],"_btv_view_count":["201"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["480261"]},"test":"austinmearsarizona-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/419386","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\/419386\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=419386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}