{"id":275319,"date":"2023-03-17T14:15:01","date_gmt":"2023-03-17T14:15:01","guid":{"rendered":"\/forum\/forums\/reply\/275319\/"},"modified":"2023-03-17T14:15:01","modified_gmt":"2023-03-17T14:15:01","slug":"275319","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/275319\/","title":{"rendered":"Reply To: Program controlled normal stiffness &#8211; When to use and when to override?"},"content":{"rendered":"<p>&lt;p&gt;One type of model that is sensitive to contact penetration is the interference fit problem of a shaft in a hole. Stress in the parts changes a lot with the amount of penetration. An increase in Normal Stiffness of the contact can reduce penetration, but that is not the only adjustment needed to get accurate results in this model. I found that I also had to adjust the Analysis Setting. Under Nonlinear Controls,&nbsp; override the Program Controlled Displacement Convervgence Tolerance and type in a much smaller value than 0.5%.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-275319","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=\"One type of model that is sensitive to contact penetration is the interference fit problem of a shaft in a hole. Stress in the parts changes a lot with the amount of penetration. An increase in Normal Stiffness of the contact can reduce penetration, but that is not the only adjustment needed to get accurate\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/275319\/\" \/>\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: Program controlled normal stiffness \u2013 When to use and when to override? | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"One type of model that is sensitive to contact penetration is the interference fit problem of a shaft in a hole. Stress in the parts changes a lot with the amount of penetration. 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