{"id":365420,"date":"2024-05-03T13:24:07","date_gmt":"2024-05-03T13:24:07","guid":{"rendered":"\/forum\/forums\/reply\/365420\/"},"modified":"2024-05-03T13:24:07","modified_gmt":"2024-05-03T13:24:07","slug":"365420","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/365420\/","title":{"rendered":"Reply To: A question about quasi-static loading and oscillating response"},"content":{"rendered":"<p>&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;&#8221;&gt;&lt;span style=&#8221;font-size: 12.0pt; font-family: &#8216;Times New Roman&#8217;,serif; mso-fareast-font-family: &#8216;Times New Roman&#8217;; mso-font-kerning: 0pt; mso-ligatures: none;&#8221;&gt;Hello Andreas,&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;&#8221;&gt;&lt;span style=&#8221;font-size: 12.0pt; font-family: &#8216;Times New Roman&#8217;,serif; mso-fareast-font-family: &#8216;Times New Roman&#8217;; mso-font-kerning: 0pt; mso-ligatures: none;&#8221;&gt;In any explicit simulation some degree of dynamic effects will be present, even if the ratio of kinetic energy to internal energy falls below 5%. There are couple of options that you could try:&nbsp;&lt;\/span&gt;&lt;\/p&gt;<\/p>\n<ol start=\"1\">&lt;li class=&#8221;MsoNormal&#8221; style=&#8221;mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;&#8221;&gt;&lt;span style=&#8221;font-size: 12.0pt; font-family: &#8216;Times New Roman&#8217;,serif; mso-fareast-font-family: &#8216;Times New Roman&#8217;; mso-font-kerning: 0pt; mso-ligatures: none;&#8221;&gt;Include damping in your simulation. &lt;\/span&gt;<\/li>\n<p>&lt;li class=&#8221;MsoNormal&#8221; style=&#8221;mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;&#8221;&gt;&lt;span style=&#8221;font-size: 12.0pt; font-family: &#8216;Times New Roman&#8217;,serif; mso-fareast-font-family: &#8216;Times New Roman&#8217;; mso-font-kerning: 0pt; mso-ligatures: none;&#8221;&gt;Check the material models, if all of them are elastic and there is no damping, the system will oscillate more than a physical one. Please check if there are materials with viscoelastic properties in the model.&nbsp;&lt;br&gt;&lt;\/span&gt;<\/li>\n<p>&lt;li class=&#8221;MsoNormal&#8221; style=&#8221;mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;&#8221;&gt;&lt;span style=&#8221;font-size: 12.0pt; font-family: &#8216;Times New Roman&#8217;,serif; mso-fareast-font-family: &#8216;Times New Roman&#8217;; mso-font-kerning: 0pt; mso-ligatures: none;&#8221;&gt;Incorporate a dynamic relaxation phase in your simulation. Please check: https:\/\/ftp.lstc.com\/anonymous\/outgoing\/jday\/bolt_preload3.pdf&lt;\/span&gt;<\/li>\n<p>&lt;li class=&#8221;MsoNormal&#8221; style=&#8221;mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;&#8221;&gt;&lt;span style=&#8221;font-size: 12.0pt; font-family: &#8216;Times New Roman&#8217;,serif; mso-fareast-font-family: &#8216;Times New Roman&#8217;; mso-font-kerning: 0pt; mso-ligatures: none;&#8221;&gt;If you are not interested in dynamic events at all, the implicit solver can be used to solve the model.&lt;\/span&gt;<\/li>\n<\/ol>\n<p>&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;&#8221;&gt;&lt;span style=&#8221;font-size: 12.0pt; font-family: &#8216;Times New Roman&#8217;,serif; mso-fareast-font-family: &#8216;Times New Roman&#8217;; mso-font-kerning: 0pt; mso-ligatures: none;&#8221;&gt;Regarding your follow up question. It is hard to define what is a quasi-static condition for an explicit model. The 5% threshold is also just a rough estimate, not a specific threshold value. It &lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp;&lt;\/span&gt;might not be applicable to some models. The question that should be asked if the rigid body would have a 0 acceleration will the result change, by how much? If the answer is that it will change too much then yes, the 0 acceleration should be pursued.&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;&#8221;&gt;&lt;span style=&#8221;font-size: 12.0pt; font-family: &#8216;Times New Roman&#8217;,serif; mso-fareast-font-family: &#8216;Times New Roman&#8217;; mso-font-kerning: 0pt; mso-ligatures: none;&#8221;&gt;Please let me know, &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;&#8221;&gt;&lt;span style=&#8221;font-size: 12.0pt; font-family: &#8216;Times New Roman&#8217;,serif; mso-fareast-font-family: &#8216;Times New Roman&#8217;; mso-font-kerning: 0pt; mso-ligatures: none;&#8221;&gt;Thank you,&lt;br&gt;Alex &lt;\/span&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-365420","reply","type-reply","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=\"Hello Andreas,In any explicit simulation some degree of dynamic effects will be present,\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/365420\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: A question about quasi-static loading and oscillating response | Ansys Learning Forum\" \/>\n\t\t<meta 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