{"id":442995,"date":"2025-10-03T19:14:34","date_gmt":"2025-10-03T19:14:34","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-to-validate-plastic-deformation\/"},"modified":"2025-10-03T19:14:34","modified_gmt":"2025-10-03T19:14:34","slug":"help-to-validate-plastic-deformation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-to-validate-plastic-deformation\/","title":{"rendered":"Help to validate Plastic deformation"},"content":{"rendered":"<p>&lt;p&gt;Hello,&nbsp;&lt;\/p&gt;&lt;p&gt;I have a drop-impact simulation of a Glass+Plastic (polycarbonate) assembly. I&#8217;m get results that look like the Polycarbonate is undergoing plastic deformation.&lt;\/p&gt;&lt;p&gt;However, I have limited experience validating plastic deformation in LS-DYNA and would like some help on this. I&#8217;m especially worried if i&#8217;ve artificially introduced some non-physical plastic deformation in my attempts to eliminate Hourglass energy.&nbsp;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;text-decoration: underline;&#8221;&gt;Setup:&lt;\/span&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li>Materials: Glass &#8211; Proprietary (substrate) , Plastic, PC High viscosity &#8211; Ansys default library (around the glass perimeter) , Steel &#8211; Default library(rigid body- shell)&nbsp;<\/li>\n<li>Contacts:\n<ul>\n<li>Glass &lt;-&gt; PC : Shared topology<\/li>\n<li>PC &lt;-&gt; Plate : Frictional\n<ul>\n<li>Behavior: Asymmetric<\/li>\n<li>Formulation: Pure Penalty (Automatic_nodes_to_surface)<\/li>\n<li>Viscous damping coefficient: 0.1<\/li>\n<li>Contact \/ Target Penalty Scale Factors: 10&nbsp;<\/li>\n<li>Soft Constraint Formulations: Segment Based<\/li>\n<li>Soft constraint Scale Factor: 1<\/li>\n<li>Depth: 2<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Mesh: Hex8 (for glass, PC), and Quad4 (plate)<\/li>\n<li>Hourglass controls:&nbsp;\n<ul>\n<li>PC: ID 7 (Belytschko-Bindeman Linear Total Strain), coefficient = 1<\/li>\n<\/ul>\n<\/li>\n<li>Element Controls:\n<ul>\n<li>PC: Fully Integrated S\/R Solid<\/li>\n<\/ul>\n<\/li>\n<li>Analysis setting:\n<ul>\n<li>Global Hourglass control: ID 5 (Exact Volume Flanagam-Belytschko Stiffness Form), coefficient = 0.1<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&lt;p&gt;Points to note \/ Concerns:&nbsp;&lt;\/p&gt;<\/p>\n<ul>\n<li>High distortion of the PC (not sure how I can check this is actually physical\/ potential mesh issue)<\/li>\n<li>The contact energy increases and stays high (I think this is ok since there&#8217;s sliding at the frictional interface)<\/li>\n<li>Internal energy stays high after impact (again, I think this is physical since there&#8217;s work done on the PC layer)<\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;br&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/10\/03-10-2025-1759512237-mceclip0.png\" width=\"634\" height=\"277\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/10\/03-10-2025-1759511979-LSDyna_Impact_plastic.gif\" alt=\"\" width=\"546\" height=\"208\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/10\/03-10-2025-1759513908-mceclip1.png\" width=\"407\" height=\"228\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/10\/03-10-2025-1759518789-mceclip2.png\" width=\"746\" height=\"289\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-442995","topic","type-topic","status-publish","hentry","topic-tag-hourglass-energy","topic-tag-impact-analysis","topic-tag-impacttest-1","topic-tag-lsdyna","topic-tag-plastic-deformation-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello, I have a drop-impact simulation of a Glass+Plastic (polycarbonate) assembly. I&#039;m get results that look like the Polycarbonate is undergoing plastic deformation.However, I have limited experience validating plastic deformation in LS-DYNA and would like some help on this. 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I&#039;m get results that look like the Polycarbonate is undergoing plastic deformation.However, I have limited experience validating plastic deformation in LS-DYNA and would like some help on this. I&#039;m especially worried if i&#039;ve artificially introduced some non-physical plastic deformation in my attempts to eliminate Hourglass\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-to-validate-plastic-deformation\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2025-10-03T19:14:34+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-10-03T19:14:34+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Help to validate Plastic deformation | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello, I have a drop-impact simulation of a Glass+Plastic (polycarbonate) assembly. I&#039;m get results that look like the Polycarbonate is undergoing plastic deformation.However, I have limited experience validating plastic deformation in LS-DYNA and would like some help on this. I&#039;m especially worried if i&#039;ve artificially introduced some non-physical plastic deformation in my attempts to eliminate Hourglass\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-to-validate-plastic-deformation\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/impact-analysis\\\/#listItem\",\"name\":\"impact-analysis\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/impact-analysis\\\/#listItem\",\"position\":3,\"name\":\"impact-analysis\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/impact-analysis\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-to-validate-plastic-deformation\\\/#listItem\",\"name\":\"Help to validate Plastic deformation\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-to-validate-plastic-deformation\\\/#listItem\",\"position\":4,\"name\":\"Help to validate Plastic deformation\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/impact-analysis\\\/#listItem\",\"name\":\"impact-analysis\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-to-validate-plastic-deformation\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-to-validate-plastic-deformation\\\/\",\"name\":\"Help to validate Plastic deformation | Ansys Learning Forum\",\"description\":\"Hello, I have a drop-impact simulation of a Glass+Plastic (polycarbonate) assembly. I'm get results that look like the Polycarbonate is undergoing plastic deformation.However, I have limited experience validating plastic deformation in LS-DYNA and would like some help on this. 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