{"id":447023,"date":"2025-11-22T14:10:07","date_gmt":"2025-11-22T14:10:07","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-in-3-point-bending-test-with-contact-friction\/"},"modified":"2025-11-22T14:10:07","modified_gmt":"2025-11-22T14:10:07","slug":"divergence-in-3-point-bending-test-with-contact-friction","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-in-3-point-bending-test-with-contact-friction\/","title":{"rendered":"Divergence in 3-Point Bending Test with Contact + Friction"},"content":{"rendered":"

<p data-start=”186″ data-end=”245″><span style=”font-size: 10pt;”>Hi everyone,<\/span><br data-start=”198″ data-end=”201″><span style=”font-size: 10pt;”>Here’s what I’ve observed in the simulation:<\/span><\/p><p data-start=”247″ data-end=”443″><span style=”font-size: 10pt;”>I am testing a sandwich panel modeled with solid elements (SOLID) in a 3-point bending setup. The supports are cylinders, and I applied Remote Displacement to impose their translation.<\/span><\/p><p data-start=”445″ data-end=”609″><span style=”font-size: 10pt;”>When I set the contact between the cylinders and the sandwich as “totally bonded”, the simulation works even for relatively large displacements (e.g., 10 mm).<\/span><\/p><p data-start=”611″ data-end=”752″><span style=”font-size: 10pt;”>However, when I switch to contact with friction, the simulation only converges for small displacements. Beyond about 8 mm, it diverges.<\/span><\/p><p data-start=”754″ data-end=”788″><span style=”font-size: 10pt;”>I have added photos showing:<\/span><\/p><ul data-start=”789″ data-end=”892″><li style=”font-size: 10pt;” data-start=”789″ data-end=”830″><p data-start=”791″ data-end=”830″><span style=”font-size: 10pt;”>the case when the simulation diverges<\/span><\/p><\/li>\n

<li style=”font-size: 10pt;” data-start=”831″ data-end=”861″><p data-start=”833″ data-end=”861″><span style=”font-size: 10pt;”>the case when it converges<\/span><\/p><\/li>\n

<li style=”font-size: 10pt;” data-start=”862″ data-end=”892″><p data-start=”864″ data-end=”892″><span style=”font-size: 10pt;”>how I defined the contacts<\/span><\/p><\/li>\n<\/ul>\n

<p data-start=”849″ data-end=”987″><span style=”font-size: 10pt;”>Could someone advise what parameters I should modify to make the simulation converge for larger displacements with contact and friction?<\/span><\/p><p data-start=”849″ data-end=”987″><span style=”font-size: 10pt;”> <\/a>\"\"<\/span><\/p><\/p>\n","protected":false},"template":"","class_list":["post-447023","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27786"],"_bbp_topic_id":["447023"],"_bbp_author_ip":["2a02:8428:35a5:4f01:ec4e:4114:f27f:7f93"],"_bbp_last_reply_id":["447115"],"_bbp_last_active_id":["447115"],"_bbp_last_active_time":["2025-11-24 10:17:00"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["613448","58821"],"_btv_view_count":["285"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["613448"],"_bbp_subscription":["58821"]},"test":"ikram-marzoukiestaca-eu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/447023","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":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/447023\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=447023"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}