Highly Distorted Elements Ansys Workbench
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Lots of conversations about nonlinear modeling.- 10,000 newbies and 4 experts.- A great place to discuss anything related to FEA- Yahoo group for LS-Dyna support from experts. First of all thanks for the reply.1)Well, I utilized a value of 340 MPa as yield stress and applyied a pressure over the top of the indentor so I don't know when it beggins to deform plastically.2)I have utilized the engineering stress, but in the bilinear model the problem also persists.3)I have utilized a geometry with a tip radius of 2.5 micrometers, that is because when i utilized a perfectly sharp indentor the model could not be solved.Thanks aggain for the help, I hope I have provided the required information.
1) You should be stepping through results and seeing when stresses exceed 340 MPa, or when Equivalent Plastic Strain is non-0. Either may be tricky due to singularities, but it's something you should be checking.2) Did you derive the bilinear model from the engineering stress/strain? If so, it will also be wrong. You should convert your tested values to true stress/strain values when building the material model.3) Ok, how big is that relative to the indentor size? Assuming it's a fairly small radius (. Hi, after some tought and changing the mechanical proprieties of the model, I think that perhaps the indenter radius has a big influence in how the curve is deviating from the experimental.
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However, when I change the values of de indenter for a smaller size I get this error.Error 1:Element 4230 located in Body 'Surface Body' (and maybe other elements) has become highly distorted. You may select the offending object and/or geometry via RMB on this warning in the Messages window. Excessive distortion of elements is usually a symptom indicating the need for corrective action elsewhere. Try incrementing the load more slowly (increase the number of substeps or decrease the time step size). You may need to improve your mesh to obtain elements with better aspect ratios.
Also consider the behavior of materials, contact pairs, and/or constraint equations. If this message appears in the first iteration of first substep, be sure to perform element shape checking. Named Selections for the offending element can be created via the Identify Element Violations property on the Solution Information Object.Any idea about what it could be?.