{"id":357917,"date":"2024-03-19T14:18:01","date_gmt":"2024-03-19T14:18:01","guid":{"rendered":"\/forum\/forums\/topic\/interpreting-high-stress-results\/"},"modified":"2024-03-19T14:18:01","modified_gmt":"2024-03-19T14:18:01","slug":"interpreting-high-stress-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/interpreting-high-stress-results\/","title":{"rendered":"Interpreting high stress results"},"content":{"rendered":"<p>I&#8217;m doing a static structural analysis on a pipe support with a number of bolts. I have deafeatured the bolts so they are cylinders to aid with meshing. Each of the bolts are M8 and have a 6180N pretension added to them. The results show a peak stress on the underside of a bolt head, where it contacts a washer using a frictional contact type (coefficient = 0.2). This stress seems to only be surface level and is concentrated at one node. I don&#8217;t believe this is a singularity as when I refined the mesh on the bolt the results stayed roughly the same.<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/19-03-2024-1710857697-mceclip0.png\"> <img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/19-03-2024-1710857748-mceclip1.png\" width=\"938\" height=\"366\"><\/p>\n<p>I have two questions:<\/p>\n<ol>\n<li>Is it safe to ignore these surface level stresses if the average stress in the body of the bolt is accceptable?<\/li>\n<li>If the bolt pre-tension causes high stress in the bolt body exceeding the yield strength, does this mean my pre-tension value is too high for the bolt size or can this also be ignored?<\/li>\n<\/ol>\n<p>Thanks!<\/p>\n","protected":false},"template":"","class_list":["post-357917","topic","type-topic","status-closed","hentry","topic-tag-bolt","topic-tag-bolt-pretension","topic-tag-contact","topic-tag-equivalent-stress","topic-tag-static-structural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["338047","490"],"_bbp_author_ip":["96.7.218.215"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1278"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["357917"],"_bbp_forum_id":["27796"],"_bbp_engagement":["490","338047"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["358140"],"_bbp_last_active_id":["358140"],"_bbp_last_active_time":["2024-03-20 13:36:34"]},"test":"ryan-spenceukaea-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/357917","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\/357917\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=357917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}