{"id":293083,"date":"2023-07-14T09:31:47","date_gmt":"2023-07-14T09:31:47","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=293083"},"modified":"2023-07-14T09:31:47","modified_gmt":"2023-07-14T09:31:47","slug":"negative-jacobian-fail","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-jacobian-fail\/","title":{"rendered":"Negative Jacobian \u2013 Fail"},"content":{"rendered":"<p class=\"MsoNormal\"><span style=\"font-family: Tahoma, sans-serif;font-size: 12pt\">Can you please advice me any further steps to overcome negative Jacobian fail? The following steps were tried to handle.<\/span><\/p>\n<p class=\"MsoNormal\"><span style=\"font-family: Tahoma, sans-serif;font-size: 12pt\">The soft body impact FE model configured using SPH impactor and shell (UD facing and backing skins) &amp; solid (honeycomb core) elements of a wing. The UD elements are formed using *MAT54\/55 (Enhanced damage).<\/span><\/p>\n<ul type=\"disc\">\n<li class=\"MsoListParagraph\"><span style=\"font-size: 12pt;font-family: Tahoma, sans-serif\">ELFORM changed to reduce integration.&nbsp;<\/span><span style=\"font-size: 12pt\">Shell element formulation is converted to 2 from 16 to reduce number of integration points when I got the negative Jacobian fail (The termination rows are added to this message). *SECTION_SHELL cards are deleted after creation of *PART_COMPOSITE. Then, the section is changed on this card.<\/span><\/li>\n<li class=\"MsoListParagraph\"><span style=\"font-size: 12pt;font-family: Tahoma, sans-serif\">Hourglassing formulation type &amp; parameter<\/span><\/li>\n<li class=\"MsoListParagraph\"><span style=\"font-size: 12pt;font-family: Tahoma, sans-serif\">Number of plies increased<\/span><\/li>\n<li class=\"MsoListParagraph\"><span style=\"font-size: 12pt;font-family: Tahoma, sans-serif\">TFAIL, DFAILM, DFAILS, EFS parameters<\/span><\/li>\n<li class=\"MsoListParagraph\"><span style=\"font-size: 12pt;font-family: Tahoma, sans-serif\">Model clean-up<\/span><\/li>\n<li class=\"MsoListParagraph\"><span style=\"font-size: 12pt;font-family: Tahoma, sans-serif\">Decreasing timestep &amp; remove mass scaling<\/span><\/li>\n<li class=\"MsoListParagraph\"><span style=\"font-size: 12pt\">Solver: 2022 R1<\/span><\/li>\n<\/ul>\n<p class=\"MsoNormal\"><span style=\"font-size: 11.0pt\">Unit system: [t,mm,N,s]<\/span><\/p>\n<p><span style=\"font-size: 12pt;font-family: Tahoma, sans-serif\"><img decoding=\"async\" title=\"FE Model\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/14-07-2023-1689326322-NJ_Fail_230713_2.JPG\" alt=\"FE Model\"><\/span><\/p>\n<div><span style=\"font-size: 10pt\">SHELL ELEMENT QUALITY CHECK SUMMARY:<\/span><\/div>\n<div><em><span style=\"font-size: 10pt\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Quality Name&nbsp; &nbsp; &nbsp; &nbsp; Min. val&nbsp; &nbsp; &nbsp; &nbsp;Max. val&nbsp; &nbsp; &nbsp; &nbsp;Allowable&nbsp; &nbsp; #Violated(%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Min side length&nbsp; &nbsp; &nbsp;4.12&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5.44&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Max side length&nbsp; &nbsp; &nbsp;4.77&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;8.5&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 30&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Aspect Ratio&nbsp; &nbsp; &nbsp; &nbsp; 1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1.85&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;10&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Warpage&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0.128&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 10&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Min Quad Angle&nbsp; &nbsp; &nbsp; 88.3&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;90&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;45&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Max Quad Angle&nbsp; &nbsp; &nbsp; 90&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;91.7&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;135&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Min Tria Angle&nbsp; &nbsp; &nbsp; 0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 30&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Max Tria Angle&nbsp; &nbsp; &nbsp; 0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 120&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Taper&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0.0143&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0.7&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Skew&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1.27&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;45&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Jacobian&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0.911&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0.6&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Char. length&nbsp; &nbsp; &nbsp; &nbsp; 4.12&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5.46&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Area&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 20.6&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;45.6&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">Feature angle&nbsp; &nbsp; &nbsp; &nbsp;0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 85&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;30&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;8192(4.55%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">TimeStep&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3.98e-07&nbsp; &nbsp; &nbsp; &nbsp;5.26e-07&nbsp; &nbsp; &nbsp; &nbsp;1e-07&nbsp; &nbsp; &nbsp; &nbsp; 0(0%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">#QUADS(%):180224(100%), #TRIAS(%):0(0%), #TOTAL OF FAILED(%):8192(4.55%)<\/span><\/em><\/div>\n<div><em><span style=\"font-size: 10pt\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<\/span><\/em><\/div>\n<p><span style=\"font-size: 12pt;font-family: Tahoma, sans-serif\">Fail message from .d3hsp file:<\/span><\/p>\n<p><span style=\"font-size: 10pt\"><em><span style=\"font-family: Tahoma, sans-serif\">&nbsp;*** Warning 40098 (SOL+98)<br \/>&nbsp; &nbsp; &nbsp;ALE time step size is less than dt2ms at cycle 20<br \/>&nbsp; &nbsp; &nbsp;Mass scaling time step size of<br \/>&nbsp; &nbsp; &nbsp;element id: 456411 has a dt: 5.8372E-07<br \/>&nbsp; &nbsp; &nbsp;element id: 350107 has a dt: 5.8372E-07<br \/>&nbsp; &nbsp; &nbsp;element id: 354939 has a dt: 5.8372E-07<br \/>&nbsp; &nbsp; &nbsp;element id: 359771 has a dt: 5.8372E-07<br \/>&nbsp; &nbsp; &nbsp;element id: 369435 has a dt: 5.8372E-07<br \/>&nbsp; &nbsp; &nbsp;element id: 374267 has a dt: 5.8372E-07<br \/>&nbsp; &nbsp; &nbsp;element id: 379099 has a dt: 5.8372E-07<br \/>&nbsp; &nbsp; &nbsp;element id: 388763 has a dt: 5.8372E-07<br \/>&nbsp; &nbsp; &nbsp;element id: 393595 has a dt: 5.8372E-07<br \/>&nbsp; &nbsp; &nbsp;element id: 398427 has a dt: 5.8372E-07<br \/>&nbsp;<br \/>&nbsp;*** Warning 40101 (SOL+101)<br \/>&nbsp; &nbsp; &nbsp;ALE time step size is less than dt2ms.<br \/>&nbsp; &nbsp; &nbsp;Further output has been suppressed beyond cycle 21<br \/>&nbsp;f a i l e d &nbsp; e l e m e n t &nbsp; r e p o r t &nbsp;time= &nbsp;1.1307E-05<br \/>&nbsp; &nbsp; &nbsp;number of failed solid &nbsp;elements = 0<br \/>&nbsp; &nbsp; &nbsp;number of failed beam &nbsp; elements = 0<br \/>&nbsp; &nbsp; &nbsp;number of failed shell &nbsp;elements = 1<br \/>&nbsp; &nbsp; &nbsp;number of failed tshell elements = 0<br \/>&nbsp; &nbsp; &nbsp;shell element 782030 &nbsp;failed at time &nbsp;1.1307E-05<\/span><\/em><\/span><\/p>\n<p><span style=\"font-size: 12pt;font-family: Tahoma, sans-serif\">Regards,<\/span><\/p>\n","protected":false},"template":"","class_list":["post-293083","topic","type-topic","status-closed","hentry","topic-tag-explicit","topic-tag-lsdyna"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Can you please advice me any further steps to overcome negative Jacobian fail? The following steps were tried to handle.The soft body impact FE model configured using SPH impactor and shell (UD facing and backing skins) &amp; solid (honeycomb core) elements of a wing. The UD elements are formed using *MAT54\/55 (Enhanced damage).ELFORM changed to\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-jacobian-fail\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Negative Jacobian \u2013 Fail | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Can you please advice me any further steps to overcome negative Jacobian fail? The following steps were tried to handle.The soft body impact FE model configured using SPH impactor and shell (UD facing and backing skins) &amp; solid (honeycomb core) elements of a wing. 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The following steps were tried to handle.The soft body impact FE model configured using SPH impactor and shell (UD facing and backing skins) &amp; solid (honeycomb core) elements of a wing. The UD elements are formed using *MAT54\/55 (Enhanced damage).ELFORM changed to","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-jacobian-fail\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/14-07-2023-1689326322-NJ_Fail_230713_2.JPG","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/14-07-2023-1689326322-NJ_Fail_230713_2.JPG","article:published_time":"2023-07-14T09:31:47+00:00","article:modified_time":"2023-07-14T09:31:47+00:00","twitter:card":"summary_large_image","twitter:title":"Negative Jacobian \u2013 Fail | Ansys Learning Forum","twitter:description":"Can you please advice me any further steps to overcome negative Jacobian fail? The following steps were tried to handle.The soft body impact FE model configured using SPH impactor and shell (UD facing and backing skins) &amp; solid (honeycomb core) elements of a wing. The UD elements are formed using *MAT54\/55 (Enhanced damage).ELFORM changed to","twitter:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/14-07-2023-1689326322-NJ_Fail_230713_2.JPG"},"aioseo_meta_data":{"post_id":"293083","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"content","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":true,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2024-10-28 17:59:12","updated":"2024-10-28 17:59:12","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/explicit\/\" title=\"explicit\">explicit<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tNegative Jacobian \u2013 Fail\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"explicit","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/explicit\/"},{"label":"Negative Jacobian \u2013 Fail","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-jacobian-fail\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["23.217.200.46"],"_bbp_subscription":["48610","181804"],"_btv_view_count":["3059"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["293083"],"_bbp_forum_id":["27814"],"_bbp_engagement":["48610","181804"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["293339"],"_bbp_last_active_id":["293339"],"_bbp_last_active_time":["2023-07-17 08:43:41"]},"test":"ekayar01qub-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/293083","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\/293083\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=293083"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}