{"id":303105,"date":"2023-08-24T13:37:28","date_gmt":"2023-08-24T13:37:28","guid":{"rendered":"\/forum\/forums\/topic\/impact-simulation-help-required-interpreting-results\/"},"modified":"2023-08-24T13:37:28","modified_gmt":"2023-08-24T13:37:28","slug":"impact-simulation-help-required-interpreting-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/impact-simulation-help-required-interpreting-results\/","title":{"rendered":"Impact simulation: help required interpreting results."},"content":{"rendered":"<p>Using Explicit Dynamics, I am attempting a simulation of an impact test. This test involves dropping a round-nosed steel projectile onto an enclosure made of glass-reinforced PBT-ASA blend (Crastin). Based on stress\/strain curves from the datasheet, I have created a material model for this simulation.<\/p>\n<p>My questions are:<\/p>\n<p>1) To assess whether the part has failed or not, is comparing total strain to the strain-at-break value the best criteria?<\/p>\n<p>2) Can total strain be plotted in Explicit Dynamics? It is not available in the standard result options and I cannot find a suitable expression to input as a User Defined Result.<\/p>\n<p>3) Based on plastic strain values alone, the housing would appear to fail. However, physical testing that has been performed on this part has proven that it will remain intact even when the projectile is dropped from almost double the height specified in the simulation. I therefore find the simulation result dubious. Is the failure criteria I am using incorrect, or does there appear to be something else fundamentally wrong with the setup of the material or simulation?<\/p>\n<p>I have provided screenshots of the material properties, model setup and plastic strain contour.<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/24-08-2023-1692884206-Strain contour.jpg\" alt=\"\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/24-08-2023-1692884167-SEtup.jpg\" alt=\"\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/24-08-2023-1692884190-Material properties.jpg\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-303105","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["12673","275204","83"],"_bbp_author_ip":["23.206.193.154"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["938"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["303105"],"_bbp_forum_id":["27791"],"_bbp_engagement":["83","12673","275204"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["303802"],"_bbp_last_active_id":["303802"],"_bbp_last_active_time":["2023-08-29 09:03:46"]},"test":"hywel-daviesimi-precision-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/303105","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\/303105\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=303105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}