{"id":398093,"date":"2024-12-20T11:22:58","date_gmt":"2024-12-20T11:22:58","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-volume-error-2\/"},"modified":"2024-12-23T07:43:10","modified_gmt":"2024-12-23T07:43:10","slug":"negative-volume-error-2","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-volume-error-2\/","title":{"rendered":"Negative Volume Error"},"content":{"rendered":"<p>&lt;p&gt;I am doing high velocity impacts on ceramic combined with composite structure in LS-DYNA, but problem I am facing is defining the erosion criteria. I am using 2D axisymmetric modelling. The erosion criteria used in paper is giving me a &#8220;negative volume error&#8221; even after using hourglass type 4, TFFAC (Control timestep) with ERODE =1 and DTMIN as 0.5 (control termination) to counter this error.&lt;br&gt;Is there any way to determine the appropriate erosion criteria or is there any modelling error?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-398093","topic","type-topic","status-answered","hentry","topic-tag-impact-1","topic-tag-impact-analysis","topic-tag-lsdyna","topic-tag-negative-volume"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am doing high velocity impacts on ceramic combined with composite structure in LS-DYNA, but problem I am facing is defining the erosion criteria. I am using 2D axisymmetric modelling. 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The erosion criteria used in paper is giving me a &quot;negative volume error&quot; even after using hourglass type 4, TFFAC (Control timestep) with ERODE =1\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-volume-error-2\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-12-20T11:22:58+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-12-23T07:43:10+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Negative Volume Error | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am doing high velocity impacts on ceramic combined with composite structure in LS-DYNA, but problem I am facing is defining the erosion criteria. I am using 2D axisymmetric modelling. 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The erosion criteria used in paper is giving me a &quot;negative volume error&quot; even after using hourglass type 4, TFFAC (Control timestep) with ERODE =1"},"aioseo_meta_data":[],"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\/impact-analysis\/\" title=\"impact-analysis\">impact-analysis<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tNegative Volume Error\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":"impact-analysis","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/impact-analysis\/"},{"label":"Negative Volume Error","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-volume-error-2\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["398093"],"_bbp_author_ip":["103.144.92.167"],"_bbp_last_reply_id":["398251"],"_bbp_last_active_id":["398251"],"_bbp_last_active_time":["2024-12-23 07:36:13"],"_bbp_reply_count":["4"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["492369","495856"],"_btv_view_count":["610"],"_bbp_topic_status":["answered"],"_bbp_notification_enabled":["492369"],"_bbp_subscription":["495856","492369"]},"test":"b280cd373caf16321d8e711c23564ecdaa37144f"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/398093","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/398093\/revisions"}],"predecessor-version":[{"id":398252,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/398093\/revisions\/398252"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=398093"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}