Share this article
Continue reading with these related posts
Learn when to trust your simulations and when to build and break things. Master FEA analysis and physical testing to validate designs with confidence before production.
The best CAD package reliably supports the product, people building it, and manufacturing partners receiving its data.
When running dynamic simulations in Finite Element Analysis (FEA), the stability and accuracy of your results often hinge on one critical factor: the timestep size. Among the various methods for determining appropriate timesteps, understanding Rayleigh's time offers powerful insights into numerical stability.
Finite element analysis does not prove a design is safe. It estimates how a mathematical model behaves under assumptions about geometry, material, contact, loads, and constraints. Its strength is the ability to compare design alternatives and find where a model deserves closer attention.
Ask a specific question: does this bracket maintain the required factor of safety under a defined load case; which rib placement reduces deflection; where should a strain gauge be installed? A clear question determines the output, acceptable uncertainty, and whether a simple hand calculation may answer it first.
The coloured contour is not the analysis. The analysis is the load path created by boundary conditions. Model fixtures, contacts, bolts, gravity, thermal paths, and applied forces as realistically as the decision requires. Explain where each input came from and test reasonable alternatives when it is uncertain.
A refined mesh cannot repair a bad boundary condition
Mesh convergence checks numerical stability. It does not validate loads, contacts, material data, or the physical scenario being modelled.
Check units, reactions, deformation shape, and limiting cases. Compare a simple region to a hand calculation. Refine the mesh where gradients matter and confirm that the quantity used for a decision has stabilized. Validate important models with test data when possible.
Next: selecting additive manufacturing processes by part requirement rather than hype.
