{"id":33059,"date":"2019-02-05T04:04:08","date_gmt":"2019-02-05T04:04:08","guid":{"rendered":"\/forum\/forums\/topic\/bolt-pretension-causes-high-compressive-stress-exceeding-uts-but-deformation-is-only-0-2mm\/"},"modified":"2019-02-05T04:04:08","modified_gmt":"2019-02-05T04:04:08","slug":"bolt-pretension-causes-high-compressive-stress-exceeding-uts-but-deformation-is-only-0-2mm","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/bolt-pretension-causes-high-compressive-stress-exceeding-uts-but-deformation-is-only-0-2mm\/","title":{"rendered":"Bolt pretension causes high compressive stress exceeding UTS but deformation is only 0.2mm"},"content":{"rendered":"<p>I have done a static structural analysis of an assembled component that uses bolt connections and welds. I had defined two type of loads, 1.Bolt pretension 2.External load as force.<\/p>\n<p><\/p>\n<p>I have defined bonded contacts for all the bolt, nut interfaces and the surfaces that were mated for assembly. The results were&nbsp;not as expected. I got a peak von mises stress of 960MPa, near the bolt hole region, whereas the ultimate strength of my material (structural steel in ansys) is only 460MPa.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/2463f9a3-19cb-4ed3-8559-a9ad00bf6d21\/956c0cc4-1948-4b02-893d-a9eb00420b05_von-mises-value-exceeding-uts.jpg?width=690&amp;upscale=false\" alt=\"Von mises value exceeding UTS\"><\/p>\n<p><\/p>\n<p>NOTE-1: I have previously defined frictional contacts for bolt head and nut head interfaces, but it resulted in DOF limit exceed error and newton raphson residual showed&nbsp; my elements flew off in space. So i switched all my contacts to bonded type and got this undesired result. I am sure the component wont fail (from the experiments) that is it can never develop this high stress value.&nbsp;<\/p>\n<p><\/p>\n<p>NOTE-2: I have redesigned my original component with a generic model and have used it for this post<\/p>\n<p><\/p>\n<p><strong>Please direct me to find where the problem is in this analysis, i have attached with this the post&nbsp;my archived workbench file<\/strong><\/p>\n","protected":false},"template":"","class_list":["post-33059","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["5231"],"_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":["1","1","1","1","1"],"_btv_view_count":["4904"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["33059"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","160938","165920","173882"],"_bbp_voice_count":["4"],"_bbp_reply_count":["29"],"_bbp_last_reply_id":["107873"],"_bbp_last_active_id":["107873"],"_bbp_last_active_time":["2020-03-14 07:56:49"]},"test":"gopinathv"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/33059","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\/33059\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=33059"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}