{"id":457768,"date":"2026-05-07T10:46:46","date_gmt":"2026-05-07T10:46:46","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/2d-contact-problem-steel-base-deforms-although-it-should-be-rigid\/"},"modified":"2026-05-07T10:46:46","modified_gmt":"2026-05-07T10:46:46","slug":"2d-contact-problem-steel-base-deforms-although-it-should-be-rigid","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/2d-contact-problem-steel-base-deforms-although-it-should-be-rigid\/","title":{"rendered":"2D contact problem \u2013 steel base deforms although it should be rigid"},"content":{"rendered":"

<p data-start=”144″ data-end=”152″>Hello,<br>I am working on a 2D ANSYS Mechanical model with contact between a soft ellipse and a steel base.<\/p><p data-start=”255″ data-end=”261″>Setup:<\/p><ul data-start=”262″ data-end=”407″><li data-section-id=”dt63q2″ data-start=”262″ data-end=”289″>Ellipse = soft material, e.g. Aluminium Alloy<\/li>\n

<li data-section-id=”1do2nks” data-start=”290″ data-end=”319″>Base = steel (very stiff)<\/li>\n

<li data-section-id=”kjrukn” data-start=”347″ data-end=”407″>Displacement applied to the ellipse<\/li>\n

<li data-section-id=”kjrukn” data-start=”347″ data-end=”407″>Bottom of base is fixed<\/li>\n<\/ul>\n

<p data-start=”409″ data-end=”529″>Problem:<br data-start=”417″ data-end=”420″>The steel base shows visible deformation, although it should behave almost rigid compared to the soft body.<\/p><p data-start=”531″ data-end=”640″>If I (incorrectly) define the top line of steel base as target, the result looks correct (no deformation of the base).<\/p><p data-start=”642″ data-end=”789″><strong data-start=”642″ data-end=”655″>Question:<\/strong><br data-start=”655″ data-end=”658″>Why does the steel deform in the correct setup? How can I fix this while keeping the bottom of the base fixed?<br><br>Best Regards<br><br><\/p><p>Displacement: ellipse       Bottom line of base: fixed<br><br><br>Displacement: ellipse       Top line of base: fixed<br><br><br>Displacement: ellipse       Bottom line of base: fixed<\/p><\/p>\n","protected":false},"template":"","class_list":["post-457768","topic","type-topic","status-publish","hentry","topic-tag-2dmaterialsandmetals-1","topic-tag-contact","topic-tag-fem","topic-tag-stainless-steel-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27789"],"_bbp_topic_id":["457768"],"_bbp_author_ip":["2001:638:911:b28::4dd"],"_bbp_last_reply_id":["457891"],"_bbp_last_active_id":["457891"],"_bbp_last_active_time":["2026-05-08 17:09:57"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["677459","240"],"_btv_view_count":["138"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["240","677459"]},"test":"flying3tiger3gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/457768","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\/457768\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=457768"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}