{"id":382434,"date":"2024-09-12T07:49:55","date_gmt":"2024-09-12T07:49:55","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transient-structural-impact-analysis\/"},"modified":"2024-09-12T07:49:55","modified_gmt":"2024-09-12T07:49:55","slug":"transient-structural-impact-analysis","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transient-structural-impact-analysis\/","title":{"rendered":"Transient structural Impact analysis"},"content":{"rendered":"<p>&lt;p&gt;Hi all,&lt;\/p&gt;&lt;p&gt;Kindly let me know the reson for below issue&lt;\/p&gt;&lt;p&gt;iam doing an impact analysis projectile hitting inside an enclosed wall with initial velocity of 189m\/s. i have included gravity to acompeny with initial veloity due to self weight of the other structure on top of enclosed structure could aid the impact deformations,&lt;\/p&gt;&lt;p&gt;the initial conditions is given through displacement and time integration effects (Initial Displacement &ne; 0, Initial Velocity &ne; 0)&lt;\/p&gt;&lt;p&gt;Step1:&lt;\/p&gt;&lt;p&gt;1) displacement &#8211; 13mm with time 6.5991e-005sec&lt;\/p&gt;&lt;p&gt;2) time integration -off&nbsp;&lt;\/p&gt;&lt;p&gt;3) gravity includes&lt;\/p&gt;&lt;p&gt;Step2:&lt;\/p&gt;&lt;p&gt;1) displacement &#8211; 13mm with time 9.e-004 sec &#8211; Displacement -deactivated&lt;\/p&gt;&lt;p&gt;2) Time integration -ON&lt;\/p&gt;&lt;p&gt;3) gravity diactivated&lt;\/p&gt;&lt;p&gt;the problem is when iam trying to increase the 2nd step end time the gravity effect still adding up and creating huge stress and deformations due to self weight of the top structure hanging on the top of enclosed structure&lt;\/p&gt;&lt;p&gt;although iam able to see the after effects of impact but the stress due to gravity effects keeps on increasing with step end time.&lt;\/p&gt;&lt;p&gt;what should i do to stop the gravity effect and keep at constant? please suggest if iam missing any other analysis settings options.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/12-09-2024-1726127351-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-382434","topic","type-topic","status-publish","hentry","topic-tag-mechanical","topic-tag-transient-structural"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi all,Kindly let me know the reson for below issueiam doing an impact analysis projectile hitting inside an enclosed wall with initial velocity of 189m\/s. i have included gravity to acompeny with initial veloity due to self weight of the other structure on top of enclosed structure could aid the impact deformations,the initial conditions is\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" 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