{"id":311905,"date":"2023-10-17T18:31:55","date_gmt":"2023-10-17T18:31:55","guid":{"rendered":"\/forum\/forums\/topic\/nonlinear-analysis-problem-2\/"},"modified":"2023-10-17T18:31:55","modified_gmt":"2023-10-17T18:31:55","slug":"nonlinear-analysis-problem-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/nonlinear-analysis-problem-2\/","title":{"rendered":"Nonlinear analysis problem"},"content":{"rendered":"<p>Hello,<\/p>\n<p>I have modeled an inflatable structure with a membrane that is hyperelastic. I used the Mooney-Rivlin 5 Parameter equation to fit a curve to my uniaxial data to get a nonlinear stress-strain curve. I have modeled two structures. One structure has straps modeled and the other does not. The model without straps works when doing nonlinear analysis, but the model with straps (the straps themselves have linear material properties) does not work with nonlinear analysis. The one with straps does work when using linear materials, so the geometry should not be the problem. As seen below, the structure is simply supported on edge of the straps that sticks out away from the structure. To sum up: I know my nonlinear material properties work, I know my geometry works, but when I try the two together I get the error seen below. Any ideas how I can fix this problem?<\/p>\n<p>Thanks,<\/p>\n<p>Brian<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/17-10-2023-1697567446-Screen Shot 2023-10-17 at 1.17.49 PM.png\" alt=\"\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/17-10-2023-1697567403-Screen Shot 2023-10-17 at 1.17.09 PM.png\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-311905","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,I have modeled an inflatable structure with a membrane that is hyperelastic. I used the Mooney-Rivlin 5 Parameter equation to fit a curve to my uniaxial data to get a nonlinear stress-strain curve. I have modeled two structures. One structure has straps modeled and the other does not. 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