Reading this result: A 20-unit tip load drives a peak member force of 0.0. Linear FEA is linear: double the load and both the deflection and every member force double exactly. The 20x slider only magnifies the true (tiny) displacement so you can see it.
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How it works
This is the direct-stiffness method used in real structural FEA. Each bar contributes a stiffness matrix in global coordinates; PolySim assembles the global system, applies your supports and loads, and solves the linear system for nodal displacements — then back-computes axial force in every member. The displayed shape is the true (scaled) deformed geometry.
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Is this finite element analysis tool really free?▾
Yes. FEA Truss Simulator runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.
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No. Everything runs client-side in a modern browser — no downloads, no license, no account required to start.
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How accurate are the results?▾
The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.