{"id":359504,"date":"2024-03-28T19:37:09","date_gmt":"2024-03-28T19:37:09","guid":{"rendered":"\/forum\/?post_type=topic&p=359504"},"modified":"2024-04-11T17:17:07","modified_gmt":"2024-04-11T17:17:07","slug":"force-convergence-issue-in-solder-joint-reliability-simulations","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/force-convergence-issue-in-solder-joint-reliability-simulations\/","title":{"rendered":"Force Convergence Issue in Solder Joint Reliability Simulations"},"content":{"rendered":"

Hi Everyone,<\/p>\n

Could someone please advise on how to adjust the normal stiffness factor? I’m conducting a thermal cycle simulation of a symmetric QFN package for solder joint reliability. The solder material exhibits nonlinear behavior, making this simulation nonlinear.<\/p>\n

Here are the boundary conditions I’ve applied:<\/p>\n

Fixed support at the bottom of the PCB.
Thermal conditions applied to all bodies.
Displacement specified on faces of the symmetric plane.
Element birth and death conditions.
I’ve attached screenshots illustrating these conditions. I believe I have a sufficiently refined mesh for my model. However, I’m encountering force convergence issues.<\/p>\n

I constructed this CAD model in SpaceClaim, utilizing the “share topology” option to manage contacts in Workbench for structural simulation. However, when I open the model in Workbench, no contacts list is displayed, presumably because the contacts were shared from SpaceClaim. Consequently, when attempting to solve the solution, I encounter force convergence issues.<\/p>\n

I’ve searched online forums and found suggestions to adjust the normal stiffness factor, but I’m unable to locate this option since the contact list isn’t visible. Could someone please advise on where else I might find this option? Additionally, any alternative solutions or suggestions to achieve force convergence would be greatly appreciated. Thank you for your assistance.<\/p>\n

Regards,
Harry<\/p>\n

\"Mesh\"<\/a>  \"\"<\/a><\/p>\n

\"Simulation<\/a><\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-359504","topic","type-topic","status-closed","hentry","topic-tag-ansysworkbench-ansys-staticstructural","topic-tag-buglicensingerror-1","topic-tag-convergence-problem-1","topic-tag-solder-joint"],"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\n\t\t\n\t\t\n\t\t