{"id":357917,"date":"2024-03-19T14:18:01","date_gmt":"2024-03-19T14:18:01","guid":{"rendered":"\/forum\/forums\/topic\/interpreting-high-stress-results\/"},"modified":"2024-03-19T14:18:01","modified_gmt":"2024-03-19T14:18:01","slug":"interpreting-high-stress-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/interpreting-high-stress-results\/","title":{"rendered":"Interpreting high stress results"},"content":{"rendered":"

I’m doing a static structural analysis on a pipe support with a number of bolts. I have deafeatured the bolts so they are cylinders to aid with meshing. Each of the bolts are M8 and have a 6180N pretension added to them. The results show a peak stress on the underside of a bolt head, where it contacts a washer using a frictional contact type (coefficient = 0.2). This stress seems to only be surface level and is concentrated at one node. I don’t believe this is a singularity as when I refined the mesh on the bolt the results stayed roughly the same.<\/p>\n

<\/p>\n

I have two questions:<\/p>\n

    \n
  1. Is it safe to ignore these surface level stresses if the average stress in the body of the bolt is accceptable?<\/li>\n
  2. If the bolt pre-tension causes high stress in the bolt body exceeding the yield strength, does this mean my pre-tension value is too high for the bolt size or can this also be ignored?<\/li>\n<\/ol>\n

    Thanks!<\/p>\n","protected":false},"template":"","class_list":["post-357917","topic","type-topic","status-closed","hentry","topic-tag-bolt","topic-tag-bolt-pretension","topic-tag-contact","topic-tag-equivalent-stress","topic-tag-static-structural"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t