{"id":192400,"date":"2021-09-18T01:57:07","date_gmt":"2021-09-18T01:57:07","guid":{"rendered":"\/forum\/forums\/reply\/192400\/"},"modified":"2021-09-18T02:04:23","modified_gmt":"2021-09-18T02:04:23","slug":"192400","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/192400\/","title":{"rendered":"Reply To: contact analysis issue"},"content":{"rendered":"<p>The solver pivot warnings are because there are no constraints holding the plate.  Follow the directions below to create a 1\/4 symmetry model that, along with frictional contact, will completely support the plate.<br \/>\nDon&#8217;t use Bonded Contact, change it to Frictional Contact.<br \/>\nOpen the Geometry editor and move the ball to be tangent to the plate.<br \/>\nIn the Geometry editor, make two planes through the center of the ball to cut the ball and plate into four pieces each. Delete 3 of each to have a quarter symmetry model.<br \/>\nIn Mechancial, Add a Displacement for the two cut faces whose normals are aligned with the X axis and set X = 0 leaving Y and Z free. Add a Displacement for the two cut faces whose normals are aligned with the Z axis and set Z = 0 leaving Y and X free.  Those are your two symmetry boundary conditions.<br \/>\nEdit the force to be 6\/4 = 1.5 N since you have a 1\/4 symmetry model.<br \/>\nRight click on the Connections folder and insert a Contact Tool. Right click on it and Generate Initial Contact Status. Look at the status results and check that the Frictional contact is Closed. If it is not, edit the contact and change the Interface Treatment to Adjust to Touch.<br \/>\nClick on Analysis Settings and change Large Deflection to On.<br \/>\nSolve.  If it does not converge. Come back for more instructions.<br \/>\nIf it solved, under the Solution branch, insert a Contact tool.  Right click on the contact tool and insert a Pressure result. Now you can see which elements have a pressure to help you estimate 1\/4 of the contact area.<\/p>\n","protected":false},"template":"","class_list":["post-192400","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"The solver pivot warnings are because there are no constraints holding the plate. Follow the directions below to create a 1\/4 symmetry model that, along with frictional contact, will completely support the plate. Don&#039;t use Bonded Contact, change it to Frictional Contact. Open the Geometry editor and move the ball to be tangent to the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/192400\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: contact analysis issue | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"The solver pivot warnings are because there are no constraints holding the plate. Follow the directions below to create a 1\/4 symmetry model that, along with frictional contact, will completely support the plate. Don&#039;t use Bonded Contact, change it to Frictional Contact. 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