5 FEA mistakes beginners make (and how to avoid them)

Simulation tools have made finite element analysis (FEA) accessible to every designer. That's powerful — and risky. The software will almost always give you an answer. Whether that answer means anything depends on you.

1. Over-constraining with fixed supports

Applying a "fixed" restraint to a whole face makes it infinitely stiff — something no real bolt or weld provides. The result is often artificially high stress at the edge of the support. Use the restraint that matches reality: hinges, rollers, bolts or elastic supports.

2. Trusting stress at sharp corners

A perfectly sharp internal corner has, mathematically, infinite stress. Refine the mesh and the number just keeps climbing. That's a stress singularity, not a real failure. Model the actual fillet radius or evaluate stress a short distance away.

3. Skipping the mesh convergence check

One mesh, one answer, one decision — that's how errors slip through. Run the study at two or three mesh densities and check that the result in your region of interest stabilises. If it doesn't, the answer isn't ready.

4. Ignoring the assumptions of linear static analysis

Linear static analysis assumes small deflections, linear-elastic material and loads applied slowly. If parts deflect a lot, materials yield, or loads are impacts or vibrations, you need non-linear, dynamic or frequency studies instead.

5. Not validating with a hand calculation

Before trusting a complex model, check a simple case: a cantilever beam, a pressurised cylinder. If the software and the textbook disagree, find out why. This one habit catches unit errors, wrong materials and wrong loads.

Build judgement, not just clicks

Good simulation engineers are sceptical. They ask whether the boundary conditions are realistic, whether the mesh has converged and whether the result makes physical sense. That judgement is what our SOLIDWORKS Analysis course is built around.