I have created a solid mesh of a flange model in hypermesh. However, only one of the mesh quality criteria is not satisfied. The max angle of some hexahendral elements is slightly higher than 135° (136°). How can this affect the final results?
Note: aspect ratio, jacobian, warping angle,skewness are fine
The check of mesh quality has to do with the numerical integration of stiffness matrix [k] by Gauss quadrature in isoparametric formulation. In “full integration”, matrix [k] is computed exactly if the element has a perfect shape, i.e. cube for hexahedral elements, square for plane quadrilateral elements, etc. Any deviation from this ideal shape will introduce approximations in the numerical computation of [k]. If distortion is excessive, numerical integration may even become impossible (à problem with Jacobian). Of course, if distortion is limited to few elements far apart the critical location of interest, the mesh could be considered acceptable. However, no general conclusions can be drawn without seeing the mesh.
- It's always your choice, depends on how accurate you want your numerical results to be. If percentage of elements going off the desired quality is not critical, you can certainly move forward.
- It also depends upon type of analysis the meshed model is being used in. For e.g., if it's implicit analysis and only static response needs to be captured, moving with larger angle is ok unless you have good flow of mesh so that it gives you good contour. While for explicit analysis, it will result into taking smaller time step otherwise it might create problem in getting model converged.
- It's always good to check how your mesh is impacting your results, therefore perform mesh sensitivity analyses.
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