{"id":464079,"date":"2026-10-10T00:28:16","date_gmt":"2026-10-10T00:28:16","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/adding-linear-viscoelasticity-to-the-passive-component-of-a-muscle-model\/"},"modified":"2026-10-10T00:28:16","modified_gmt":"2026-10-10T00:28:16","slug":"adding-linear-viscoelasticity-to-the-passive-component-of-a-muscle-model","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/adding-linear-viscoelasticity-to-the-passive-component-of-a-muscle-model\/","title":{"rendered":"Adding Linear Viscoelasticity to the Passive Component of a Muscle Model"},"content":{"rendered":"<p data-pm-slice=\"1 1 []\">Hi everyone,<\/p>\n<p>I&#8217;m looking for a way to include linear viscoelastic behavior in the passive component of the muscles in LS-DYNA.<\/p>\n<p>I&#8217;m considering either *MAT_MUSCLE (*MAT_156) or *MAT_SPRING_MUSCLE (*MAT_S15). Ideally, I&#8217;d like to model the passive response using a linear viscoelastic formulation (such as a Prony series) while keeping the active muscle behavior unchanged.<\/p>\n<p>Does anyone know if this is possible with either of these material models? Or is there another way to achieve this, such as adding a separate viscoelastic element in parallel?<\/p>\n<p>I&#8217;d appreciate any suggestions or examples.<\/p>\n<p>Thanks!<\/p>\n","protected":false},"template":"","class_list":["post-464079","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi everyone, I&#039;m looking for a way to include linear viscoelastic behavior in the passive component of the muscles in LS-DYNA. I&#039;m considering either *MAT_MUSCLE (*MAT_156) or *MAT_SPRING_MUSCLE (*MAT_S15). Ideally, I&#039;d like to model the passive response using a linear viscoelastic formulation (such as a Prony series) while keeping the active muscle behavior unchanged. 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