{"id":394660,"date":"2024-11-21T03:17:23","date_gmt":"2024-11-21T03:17:23","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394660\/"},"modified":"2024-11-21T03:23:01","modified_gmt":"2024-11-21T03:23:01","slug":"394660","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394660\/","title":{"rendered":"Reply To: fastener preload with random vibration or shock"},"content":{"rendered":"<p>&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;I had dealt with this same issue at work many months ago.&nbsp; &nbsp;Just as Dave Looman up there said (Hi Dave), nominal stress on the bolt does not change until preload is exceeded.&nbsp; &nbsp;in addition, shock\/random vibe are linear dynamic analysis which means we cannot model contact separations (contact nonlineraity).&nbsp;&lt;\/p&gt;&lt;p&gt;The key to simulation is to have a clear objective and understand the limitations of the method with respect to that objective.&nbsp; &nbsp;It&rsquo;s hardly &ldquo;conservative&rdquo; to add shock induced stress on top of preload induced stress to calculate max load, I think it&rsquo;s straight-up incorrect.&nbsp; &nbsp;that&rsquo;s my opinion at least.&nbsp; &nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394660","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=\"I had dealt with this same issue at work many months ago. Just as Dave Looman up there said (Hi Dave), nominal stress on the bolt does not change until preload is exceeded. in addition, shock\/random vibe are linear dynamic analysis which means we cannot model contact separations (contact nonlineraity). The key to simulation is to\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394660\/\" \/>\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: fastener preload with random vibration or shock | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I had dealt with this same issue at work many months ago. Just as Dave Looman up there said (Hi Dave), nominal stress on the bolt does not change until preload is exceeded. in addition, shock\/random vibe are linear dynamic analysis which means we cannot model contact separations (contact nonlineraity). The key to simulation is to\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394660\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-11-21T03:17:23+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-11-21T03:23:01+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: fastener preload with random vibration or shock | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I had dealt with this same issue at work many months ago. Just as Dave Looman up there said (Hi Dave), nominal stress on the bolt does not change until preload is exceeded. in addition, shock\/random vibe are linear dynamic analysis which means we cannot model contact separations (contact nonlineraity). 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