{"id":383646,"date":"2024-09-23T11:08:21","date_gmt":"2024-09-23T11:08:21","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/bonded-contact-failed-in-modal-analysis\/"},"modified":"2024-09-23T14:11:24","modified_gmt":"2024-09-23T14:11:24","slug":"bonded-contact-failed-in-modal-analysis","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/bonded-contact-failed-in-modal-analysis\/","title":{"rendered":"Bonded contact failed in Modal Analysis"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;Hello, I am performing 2D modal analysis on a assembly of Elliptical cam and ball bearing, bearing is fitted on elliptical cam. I merge two blocks structural and modal analysis, in structural I am using two steps, Step 1: Frictionless contact is used with Add Offset, ramping effects between cam and inner race of bearing, at initial there is interface between two surface along Major axis and there is gap of 0.35mm along minor axis. step 2: Change the contact to Bonded. after these 2 steps I saw that there is small gap of 40 micron between surfaces along minor axis but Bonded contact status is shown closed or successfully bonded contact created between two surfaces.&lt;\/p&gt;&lt;p&gt;After that performed modal analysis on this assembly, applied remote displacement at center of cam, only rotation in Z direction is allowed for Cam and restricted in Xand Y direction, I am expecting 1st mode with 0 frequency as just 1 DOF kept free in assembly. But in 1st mode shape, bearing fly off from assembly. I don&#8217;t know exactly why this happened. Is that because of small gap between contacting surface this happend? If so, is there any way to closed that with any offset settings. Kindly guide me, so that I can correctly simulate problem and get expected results&lt;\/p&gt;&lt;p&gt;note: If I take just elliptical cam without bearing and put same boundary condition, I get 1st mode with 0 frequency and rotating in z directio&lt;\/p&gt;&lt;p&gt;attaching image of bonded contatct settings&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/23-09-2024-1727089392-Bonded contact set.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-383646","topic","type-topic","status-publish","hentry","topic-tag-mechanicalworkbench-1","topic-tag-Modal_Analysis-1","topic-tag-bonded-contact","topic-tag-contact"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello, I am performing 2D modal analysis on a assembly of Elliptical cam and ball bearing, bearing is fitted on elliptical cam. 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