{"id":290519,"date":"2023-06-27T09:20:16","date_gmt":"2023-06-27T09:20:16","guid":{"rendered":"\/forum\/forums\/topic\/ansys-mechanical-problem-using-frictional-contact-instead-of-bonded\/"},"modified":"2023-06-27T09:20:16","modified_gmt":"2023-06-27T09:20:16","slug":"ansys-mechanical-problem-using-frictional-contact-instead-of-bonded","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-mechanical-problem-using-frictional-contact-instead-of-bonded\/","title":{"rendered":"Ansys Mechanical – Problem Using Frictional Contact Instead of Bonded"},"content":{"rendered":"

Hi,<\/p>\n

I am modelling a pump clamp in Ansys Mechanical. The clamp itself consists of two solid parts: one upper and one lower part. These parts are held together by six preloaded bolts. Furthermore, the lower part is connected to two foot brackets via four more bolts. The underside of these bolts have a fixed support boundary condition. The inner surface of the upper part of the clamp are also fixed in the vertical direction in order to make the pretensioning of the first six bolts possible (the clamp is supposed to clamp around a cylinder-like pump):<\/p>\n

<\/p>\n

I have manually created all the contacts in the model. Between each of the two foot brackets and the plates extending from the lower part of the clamp, there are four bolt spacers on each side. These are connected to both the foot brackets and the plates using asymmetric frictional contact with a friction coefficient of 0,2:<\/p>\n

<\/p>\n

This seems to be the problem: I get solver pivot errors when using this contact type here (but the same frictional contact definition is no problem elsewhere in the model). Despite the pivot error the solver continues to solve the problem, but it will not converge. However, if I change the contact definition to bonded everything is ok, but this is to unphysical.<\/p>\n

What am I doing wrong here? I have generated initial contact information results, but I can’t find anything problematic in those results.<\/p>\n

I am attaching a link to the workbench archive file here: https:\/\/drive.google.com\/drive\/folders\/1gQrU1Cj09HNPmTgwvYGFs-C1EuOFRRLc?usp=sharing<\/a><\/p>\n

Thanks!<\/p>\n","protected":false},"template":"","class_list":["post-290519","topic","type-topic","status-closed","hentry","topic-tag-ansyscontact-1","topic-tag-bonded-contact","topic-tag-frictional-contact","topic-tag-mechanical"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["208645","170445"],"_bbp_author_ip":["23.217.200.46"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2463"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["290519"],"_bbp_forum_id":["27796"],"_bbp_engagement":["170445","208645"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["290908"],"_bbp_last_active_id":["290908"],"_bbp_last_active_time":["2023-06-29 12:29:51"]},"test":"tortjubystol-no"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/290519","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\/290519\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=290519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}