This blog will highlight some top Inventor Nastran nonlinear tips to help you set up and analyze with confidence.
• Always run a linear analysis first to check if the yield limit has been exceeded.
• Keep the model simple and consider symmetry.
• Perform distortion checks to make sure there are no severely distorted elements.
• Only apply nonlinear materials in the areas of the model where you expect nonlinear or plastic behavior. This will help speed up the analysis and improve the convergence rate.
• Split faces at contact regions to reduce the number of generated contacts.
• Use Linear elements instead of Parabolic elements to help with achieving faster convergence in results.
• Use Continuous Meshing for Surface models to connect surfaces eliminating the need to create contacts. Contacts increase solution times.
• Leave the Number of Increments field blank in the Nonlinear Setup dialogue box. The software will calculate the optimum number of increments.
• Equivalent Stress Results follow the stress and strain curve data. Use this to analyze your stress and strain results.
• Use the NPROCESSORS parameter to increase the number of cores to help speed up analysis times.
• Use explicit solvers if you are expecting high strains.
• Run the modal analysis to determine the Dominant Frequency W3 required for Nonlinear Transient Response Analysis.
• Use multiple subcases to determine permanent deformations in Nonlinear Static Analysis. With the first being loaded and the second being unloaded.
• Use multiple subcases to allow different time steps in Nonlinear Transient Response Analysis.
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