Input
A three-part welded steel bracket, supplied as a STEP AP214 assembly. The questions: peak stress under service load, safety factor against yield, and the first three natural frequencies.
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CAD geometry as received. Neutral grey shading, isometric view, no annotations, dark background. 1600×1000.
Preparation and mesh
Small fasteners and cosmetic features were removed. Parts were coupled with MPC contacts at the weld interfaces. Automatic tetrahedral mesh, with local refinement at the two fillets identified as stress concentrators.
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Mesh close-up on the refined fillet, wireframe over surface, size gradient clearly visible. 1600×1000.
Results
Peak von Mises stress at the lower fillet, with the resulting safety factor against yield; maximum displacement at the free end; and the first natural frequency compared against the drive unit's excitation frequency.
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Von Mises field on deformed shape. Blue→yellow→red scale matching the site's stress tokens, legend with units visible in frame. 1600×1000.
Mesh sensitivity
Refining the critical region changed the peak stress by only a small margin between the last two mesh levels, which is what tells you the result is converged enough for the decision being made.
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Small line chart, peak stress vs element count, plotted on the site's dark surface colour. 1200×700.
What we'd suggest
Increasing the lower fillet radius reduces the peak stress at no mass penalty. The upper rib carries very little load and looks like a candidate for removal — worth a follow-up run before committing.