{"id":277363,"date":"2023-03-31T13:11:14","date_gmt":"2023-03-31T13:11:14","guid":{"rendered":"\/forum\/forums\/topic\/explicit-dynamics-insertion-of-the-needle-stresses-in-the-needle\/"},"modified":"2023-04-03T07:08:08","modified_gmt":"2023-04-03T07:08:08","slug":"explicit-dynamics-insertion-of-the-needle-stresses-in-the-needle","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/explicit-dynamics-insertion-of-the-needle-stresses-in-the-needle\/","title":{"rendered":"Explicit Dynamics – Insertion of the needle. Stresses in the needle"},"content":{"rendered":"

Explicit Dynamics – Insertion of the needle. Stresses in the needle<\/p>\n

Hi. I am doing a simple needle insertion simulation in Explicit Dynamics software. I have tissue and needle – both linear material<\/strong> (tissue has a failure). The needle has an assigned velocity (I also tried with displacement), the tissue is fixed at the bottom. In the first step I insert the needle, in the second step I pull it out. After pull out, there is still stress in the needle (similar or the same as at the end of the insertion). Why are there the stresses after the needle is pulled out?<\/strong>
The analysis is without mass scaling (I also tried with scaling). I have tested different default settings (Low and high speed, quasi static, drop test), different needle velocities and there are always stresses in the needle at the end of the analysis.<\/p>\n

Boundary conditions
<\/a><\/p>\n

Insertion and pull-out. von Mises stress map in the needle
<\/a><\/a><\/p>\n

Chart of maximum needle von Mises stress in the needle<\/strong>
<\/a><\/p>\n","protected":false},"template":"","class_list":["post-277363","topic","type-topic","status-closed","hentry","topic-tag-explicitdynamicssolverautodyne-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["280861","88","83"],"_bbp_author_ip":["23.192.164.14"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["887"],"_edit_lock":["1680505429:213044"],"_bbp_likes_count":["1"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["277363"],"_bbp_forum_id":["27814"],"_bbp_engagement":["83","88","280861"],"_bbp_voice_count":["3"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["278792"],"_bbp_last_active_id":["278792"],"_bbp_last_active_time":["2023-04-11 08:14:19"]},"test":"t-dylakcim-mes-com-pl"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/277363","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\/277363\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=277363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}