{"id":316647,"date":"2023-11-09T12:04:23","date_gmt":"2023-11-09T12:04:23","guid":{"rendered":"\/forum\/forums\/topic\/simulation-of-a-tensile-test-to-validate-material-properties\/"},"modified":"2023-11-09T12:04:23","modified_gmt":"2023-11-09T12:04:23","slug":"simulation-of-a-tensile-test-to-validate-material-properties","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/simulation-of-a-tensile-test-to-validate-material-properties\/","title":{"rendered":"Simulation of a Tensile Test to validate material properties"},"content":{"rendered":"

Dear community,<\/p>\n

I have received raw data from a tensile test of a hardened stainless steel and I would like to use that data in Mechanical. I saw a very nice tutorial from Ansys on how to do it and followed all the steps to extract a data set of true stress x true plastic strain, so I could input it into a Multilinear Isotropic Hardening model.<\/p>\n

<\/p>\n

Then I created a model of the specimen used in the test and simulated the test conditions (one end fixed, one end with displacement BC), in order to verify if the response from Ansys would really correspond to the data I used as input. One can see in the chart below that it correlated pretty well.<\/p>\n

<\/p>\n

 <\/p>\n

Although this is looking fine, there are two things that I don’t understand:<\/p>\n

    \n
  1. Why is the stress still increasing after the last input data point? I thought that Ansys did not extrapolate the data, but rather it would consider a perfectly plastic behavior from that point onwards (no stress increase with increasing strain).<\/li>\n
  2. Looking at the deformed model (picture below), one can notice 3 necking areas showing up simultaneously. I was expecting just a single necking region in the center of the specimen. I am not sure if this could be an indication of flaws on the material model, or on the FE model, or in the physics setup.<\/li>\n<\/ol>\n

    <\/p>\n

    I am looking forward to hearing your impressions on that topic!  \ud83d\ude42<\/p>\n

    Kind regards,
    Henrique<\/p>\n","protected":false},"template":"","class_list":["post-316647","topic","type-topic","status-closed","hentry","topic-tag-material-model","topic-tag-Multilinearisotropichardeningmodel-1","topic-tag-tensile-test"],"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