{"id":395471,"date":"2024-11-27T07:12:37","date_gmt":"2024-11-27T07:12:37","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/initial-stress-shell-application-and-histvarcosine-in-ls-dyna\/"},"modified":"2024-11-27T07:12:37","modified_gmt":"2024-11-27T07:12:37","slug":"initial-stress-shell-application-and-histvarcosine-in-ls-dyna","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/initial-stress-shell-application-and-histvarcosine-in-ls-dyna\/","title":{"rendered":"Initial Stress Shell Application and HistVarCosine in LS-DYNA"},"content":{"rendered":"<p>&lt;p&gt;Hello\uff0c&lt;\/p&gt;&lt;p&gt;I have a question regarding the application of Initial Stress Shell in tensile testing:&lt;br&gt;Using LS-DYNA version 4.11, under <strong>Application &gt; Plastics Analysis &gt; Import Data from Moldex3D<\/strong>, I obtained a set of Initial Stress Shell data for short fiber-reinforced composite injection molding. When I used this Initial Stress Shell data for tensile simulation, the test section of the shell suddenly disappeared. However, when I ran the tensile simulation without adding the Initial Stress Shell, the process proceeded normally.&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;vertical-align: inherit;&#8221;&gt;&lt;span style=&#8221;vertical-align: inherit;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/27-11-2024-1732691415-D3Plot exp state1.png\" alt=\"\" width=\"390\" height=\"152\" \/>&lt;br&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/27-11-2024-1732691396-D3Plot exp state2.png\" alt=\"\" width=\"390\" height=\"152\" \/>&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;I am unsure whether it is inappropriate to directly add the Initial Stress Shell keyword for the simulation or if it was not correctly referenced.&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;vertical-align: inherit;&#8221;&gt;&lt;span style=&#8221;vertical-align: inherit;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/27-11-2024-1732691460-Initial Stress shell .png\" alt=\"\" width=\"516\" height=\"312\" \/>&lt;\/span&gt;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;I found some web pages related to history variables, but I couldn&#8217;t determine what these six variables specifically represent. It seems that History Variable 1 corresponds to the tensor component &lt;span class=&#8221;katex&#8221;&gt;&lt;span class=&#8221;katex-mathml&#8221;&gt;a11&lt;\/span&gt;&lt;span class=&#8221;mord&#8221;&gt;&lt;span class=&#8221;vlist-r&#8221;&gt;&lt;span class=&#8221;vlist-s&#8221;&gt;\u200b&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;.&lt;br&gt;https:\/\/www.dynasupport.com\/howtos\/material\/history-variables&lt;\/p&gt;&lt;p&gt;Additionally, could you please explain the application of the <strong>d3plot<\/strong> file under <strong>Post &gt; Vector &gt; HistVarCosine<\/strong>, particularly regarding the directions? I couldn&rsquo;t find relevant information and wasn&rsquo;t able to figure it out myself.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-395471","topic","type-topic","status-publish","hentry","topic-tag-initialization","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=\"Hello\uff0cI have a question regarding the application of Initial Stress Shell in tensile testing:Using LS-DYNA version 4.11, under Application &gt; Plastics Analysis &gt; Import Data from Moldex3D, I obtained a set of Initial Stress Shell data for short fiber-reinforced composite injection molding. 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