{"id":395059,"date":"2024-11-23T17:43:26","date_gmt":"2024-11-23T17:43:26","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/nonlinearity-convergance-problem\/"},"modified":"2024-11-23T17:43:26","modified_gmt":"2024-11-23T17:43:26","slug":"nonlinearity-convergance-problem","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/nonlinearity-convergance-problem\/","title":{"rendered":"Nonlinearity convergance problem"},"content":{"rendered":"

<p>Welcome, I’m a mechanical engineering student doing a simulation of a kind of push rod. The push rod is inside of an aluminum body that a min 0,1 mm distance from the face of this body. I create the model using surface to interpret of body. So i got in model with 10 surfaces and 1 solid body component of push rode:<br><\/p><p>I use structural steel NL (from ANSYS ENgineering Data) for push rode, and structural steel for surfaces (they are only for boundary and what contact pressure is). I make 0,4 mm thickness for each surface and bottom <\/em><\/strong>offset type. <br>Contacts were generated automatically i changed the setting for frictionless <\/strong><\/em>type and target shell face as bottom,<\/strong><\/em> <\/strong>the details of contact and showing contact and target:<br><br>I generate general a mesh on the body using 1mm element size with capture curvature<\/em><\/strong> and capture proximity.  <\/em><\/strong>For surfaces, I make 2 different face sizing, first with 1 mm element size and second with 5mm element size. <br>The mesh looks like:<br><br>Boundary condition are specified:<br>A – Force of component Fz = -100N<br>B – Fixed support at all faces <br>C – fixed support on hole <br>  <\/p><p>in the analysis setting i switch on Large deflection <\/em><\/strong>in this case is there auto time stepping: program controlled<\/strong><\/em>  i tried another option givingg around 150\/200 initial steps but this does not help. <\/p><p>In solution i got no convconvergent force <\/p><p><\/p><p>I got this kind of warnings and error:<br><br><br><\/p><p>Could someone help how to deal with this kind of situation? I tried changing the mesh and some behaviour, and nothing helped.<br>Thank in advance!<\/p><\/p>\n","protected":false},"template":"","class_list":["post-395059","topic","type-topic","status-publish","hentry","topic-tag-convergenceerror-1","topic-tag-ConvergenceFailure-1","topic-tag-convergence-issue","topic-tag-convergence-issues-1","topic-tag-convergence-problem-1","topic-tag-nonlinear","topic-tag-nonlinear-contacts","topic-tag-structural-nonlinear"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t