{"id":28968,"date":"2018-03-28T15:50:48","date_gmt":"2018-03-28T15:50:48","guid":{"rendered":"\/forum\/forums\/topic\/modelling-plastic-deformation-of-a-column\/"},"modified":"2018-03-28T15:50:48","modified_gmt":"2018-03-28T15:50:48","slug":"modelling-plastic-deformation-of-a-column","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/modelling-plastic-deformation-of-a-column\/","title":{"rendered":"Modelling plastic deformation of a column"},"content":{"rendered":"

Hey,<\/p>\n

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Since a few days I am trying to simulate the plastic behaviour of a pinned-pinned column under axial compression. To implement an initial imperfection, I ran a linear buckling analysis first and exported the solution to a static structural analysis via APDL code (see picture), which worked out quite good.<\/p>\n

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To save some calculation time, I modeled only one half of the column in this static structural analysis and added a symmetry Region to the right faces. I added constraints and a ramped force to the system shown in the following picture (same as in the linear buckling analysis). As I want to simulate pinned-pinned support, I added a fixed support and a displacement with Uz as only degree of freedom to the load application plates (self-defined very stiff material) at the top and bottom of the column respectively. All of the contacts are being modeled as bonded. As a material for the column I defined a multilinear material (taking effects of thermal degradation into account as I want to simulate this effect in an next step), which can be seen in the next picture. After a while of solving this problem, ANSYS WB 18.2 stops the solution by sending several warnings and errors (see picture). Although sending all of those errors, I can view the results, which do not look too bad. After checking stresses and strains of the viewable results I found out, that ANSYS only solved up until the point at which plastic deformation occurs (same problem while using the default material “Structural Steel NL” from the WB material database, so that I assume, that this problem is not due to a wrong definition of my own material).<\/p>\n

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I would be so thankful, if anyone has an idea on what my fault is.<\/p>\n

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Thank’s very much.<\/p>\n

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