{"id":430377,"date":"2025-04-29T16:57:36","date_gmt":"2025-04-29T16:57:36","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/necking-in-tensile-specimen\/"},"modified":"2025-04-29T16:57:36","modified_gmt":"2025-04-29T16:57:36","slug":"necking-in-tensile-specimen","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/necking-in-tensile-specimen\/","title":{"rendered":"Necking in tensile specimen"},"content":{"rendered":"

<p>I am simulating a uniaxial tensile test on a stainless steel specimen using ANSYS APDL under static structural analysis. The analysis is conducted only on the gauge section of the specimen, and the loading is applied in a displacement-controlled manner. The material’s post-elastic behaviour is modelled using the <em data-start=”444″ data-end=”450″>MISO<\/em> hardening model, with parameters adopted from Soares et al. (https:\/\/doi.org\/10.1590\/1980-5373-MR-2016-0932<\/a>). No explicit failure or damage model has been incorporated.<\/p><p class=”” data-start=”621″ data-end=”869″>However, beyond a certain applied displacement, I observe a drop in the reaction force and the onset of necking, which consistently initiates at the centre of the gauge length, despite no predefined geometric or material imperfection in that region.<\/p><\/p>\n

    <li class=”” data-start=”871″ data-end=”989″><p class=”” data-start=”874″ data-end=”989″>What is the underlying reason for the observed drop in load and the spontaneous onset of necking in the simulation?<\/p><\/li>\n

    <li class=”” data-start=”990″ data-end=”1109″><p class=”” data-start=”993″ data-end=”1109″>Why does necking localize specifically at the center, even though no constraints or imperfections are defined there?<\/p><\/li>\n

    <li class=”” data-start=”1110″ data-end=”1203″><p class=”” data-start=”1113″ data-end=”1203″>How can I extend the strain-hardening portion of the stress–strain curve to delay necking?<\/p><\/li>\n

    <li class=”” data-start=”1204″ data-end=”1391″><p class=”” data-start=”1207″ data-end=”1391″>Additionally, what is the best practice to introduce necking manually at a specific location and under a desired loading level (e.g., by geometric imperfection or localized softening)?<\/p><\/li>\n<\/ol>\n

    <p class=”” data-start=”1393″ data-end=”1519″>Any guidance on improving the physical realism of the simulation or controlling necking behaviour would be greatly appreciated.<\/p><p> <\/p><p> <\/p><p>\"\" \"\"<\/p><\/p>\n","protected":false},"template":"","class_list":["post-430377","topic","type-topic","status-publish","hentry","topic-tag-apdl","topic-tag-mechanical","topic-tag-tensile-test","topic-tag-uniaxial-tensile-test-1","topic-tag-von-mises-failure"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["430377"],"_bbp_subscription":["493286","240","275204"],"_bbp_author_ip":["122.177.179.227"],"_bbp_last_reply_id":["430458"],"_bbp_last_active_id":["430458"],"_bbp_last_active_time":["2025-04-30 13:59:43"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["493286","240","275204"],"_btv_view_count":["629"],"_bbp_topic_status":["unanswered"]},"test":"tamonash-janaiem-edu-in"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/430377","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\/430377\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=430377"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}