{"id":408058,"date":"2025-02-03T08:23:03","date_gmt":"2025-02-03T08:23:03","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/seeking-advice-on-negative-pressure-and-contact-analysis-in-fea\/"},"modified":"2025-02-04T12:21:54","modified_gmt":"2025-02-04T12:21:54","slug":"seeking-advice-on-negative-pressure-and-contact-analysis-in-fea","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/seeking-advice-on-negative-pressure-and-contact-analysis-in-fea\/","title":{"rendered":"Seeking Advice on Negative Pressure and Contact Analysis in FEA"},"content":{"rendered":"<p>&lt;p&gt;Dear Supporters,&lt;\/p&gt;&lt;p&gt;&nbsp;I hope this email finds you well. I am currently working on a nonlinear finite element analysis (FEA) involving a pneumatic soft actuator subjected to negative pressure conditions and contact interaction with an external object. As these analyses involve complex nonlinear behaviors, I would appreciate your advice on improving the stability and convergence of the simulations.&lt;\/p&gt;&lt;p&gt;\u25ceOverview of the Analysis&lt;\/p&gt;&lt;p&gt;The analyses I am conducting include the following cases:&lt;\/p&gt;&lt;p&gt;Negative pressure deformation: Internal air pressure is set to -0.05 MPa.&lt;\/p&gt;&lt;p&gt;Contact analysis with remote displacement: The actuator is not actively pressurized, and an external object is pressed against it using remote displacement.&lt;\/p&gt;&lt;p&gt;Contact analysis with force application: Instead of remote displacement, a 100N force is applied.&lt;\/p&gt;&lt;p&gt;Combined analysis: The actuator is subjected to both -0.05 MPa internal pressure and a 100N force.&lt;\/p&gt;&lt;p&gt;For each case, I have two versions of the solid model: one with fillets and one without. This was done to examine differences in computation time, but so far, no significant differences have been observed with the current mesh settings.&lt;br&gt;&lt;br&gt;&lt;\/p&gt;&lt;p&gt;The external object&rsquo;s material properties are not precisely defined, so a default material is currently being used.&lt;\/p&gt;&lt;p&gt;\u25ce Current Issue and Question&lt;\/p&gt;&lt;p&gt;The simulations partially progress but do not complete successfully.&lt;\/p&gt;&lt;p&gt;I suspect that refining the time step might help, but I am uncertain if that alone is sufficient.&lt;\/p&gt;&lt;p&gt;&lt;br&gt;What additional methods should I consider to improve stability and ensure the simulation completes successfully?&lt;\/p&gt;&lt;p&gt;I would greatly appreciate any insights or recommendations you may have.&lt;\/p&gt;&lt;p&gt;I have attached the relevant files for reference:&lt;\/p&gt;&lt;p&gt;https:\/\/www.dropbox.com\/scl\/fi\/z30hpbwv2qdjsw7gjb0j4\/Pneumatic.wbpz?rlkey=rmyimzlff2gijqx3l0i18etn9&amp;st=t53sq5q8&amp;dl=0&nbsp;&lt;\/p&gt;&lt;p&gt;&lt;br&gt;Thank you for your time and assistance. I look forward to your advice.&lt;br&gt;Best regards,&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-408058","topic","type-topic","status-publish","hentry","topic-tag-mechanicalworkbench-1","topic-tag-actuator","topic-tag-contact","topic-tag-hyperelasticity","topic-tag-soft-robotics"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["408058"],"_bbp_author_ip":["133.45.120.63"],"_bbp_last_reply_id":["408759"],"_bbp_last_active_id":["408759"],"_bbp_last_active_time":["2025-02-07 03:51:54"],"_bbp_reply_count":["6"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["4"],"_bbp_engagement":["338107","58821","79","240"],"_btv_view_count":["245"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["58821","338107","79","240"],"_edit_last":["338107"],"_bbp_revision_log":["a:1:{i:408305;a:2:{s:6:\"author\";i:338107;s:6:\"reason\";s:0:\"\";}}"]},"test":"f6535798eb909dca65107c46c3dd1c0dda3ff919"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/408058","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/408058\/revisions"}],"predecessor-version":[{"id":408305,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/408058\/revisions\/408305"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=408058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}