{"id":50047,"date":"2020-11-23T12:03:39","date_gmt":"2020-11-23T12:03:39","guid":{"rendered":"\/forum\/forums\/topic\/visoelastic-modeling\/"},"modified":"2020-11-23T12:03:39","modified_gmt":"2020-11-23T12:03:39","slug":"visoelastic-modeling","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/visoelastic-modeling\/","title":{"rendered":"VISOELASTIC MODELING"},"content":{"rendered":"<p>Hello,nI am modeling 3D chip stacking structure, which contains underfill (belongs to viscoelastic material). To some reasons I can not simplify this material as elasticity, so I want to ask if I want to simulate viscoelasticity, what material data I have to input . As far as I know, &#8216;Viscoelastic test data&#8217;, &#8216;Prony series pairs&#8217;, and &#8216;Shift function&#8217; are related to defining viscoelasticity in workbench. I should input all three kind of data ? Or Prony series pairs + Shift function(I have to consider the effect of temperature, so Shift function is necessary).nIf you could help me about this, it is nice! Besides , if you are also in this region (electronic packaging), welcome discussing!nBest wishes!n<\/p>\n","protected":false},"template":"","class_list":["post-50047","topic","type-topic","status-closed","hentry","topic-tag-nonlinear","topic-tag-viscoelasticity"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,nI am modeling 3D chip stacking structure, which contains underfill (belongs to viscoelastic material). To some reasons I can not simplify this material as elasticity, so I want to ask if I want to simulate viscoelasticity, what material data I have to input . 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