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Simulating shear and bending on a welded tow hook bracket

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I’m designing a welded tow hook bracket for a lightweight off-road trailer (max gross weight 850 kg), made from 8 mm thick mild steel plates (S355), joined with full-penetration fillet welds. I’m running a static FEA in SolidWorks to simulate pulling and angled side loads during recovery scenarios, but I’m getting unexpectedly low stress values around the weld areas, even with a reasonably refined mesh (avg. element size ~1.5 mm).

Could this be a meshing issue, or is it just an inherent limitation of the way fillet welds are represented in CAD-based FEA? I’m not sure whether I should model the welds explicitly or apply connector-based simplifications.

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      I’m designing a welded tow hook bracket for a lightweight off-road trailer (max gross weight 850 kg), made from 8 mm thick mild steel plates (S355), joined with full-penetration fillet welds. I’m running a static FEA in SolidWorks to simulate pulling and angled side loads during recovery scenarios, but I’m getting unexpectedly low stress values around the weld areas, even with a reasonably refined mesh (avg. element size ~1.5 mm).

      Could this be a meshing issue, or is it just an inherent limitation of the way fillet welds are represented in CAD-based FEA? I’m not sure whether I should model the welds explicitly or apply connector-based simplifications.

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    • R

      Hey, sounds like you’re running into a common FEA issue in SolidWorks. Full-penetration fillet welds often get oversimplified, especially if you’re not modeling the welds directly – which leads to underestimated stresses.
      Best fix? Try explicitly modeling the weld bead. It takes a finer mesh but gives much more accurate results. If that’s too much, SolidWorks’ “welded connection” features or mesh refinement tools can help as a compromise. Also, check if you’re using the right material properties — the default base material might not reflect the weld zone properly. A more realistic material model can improve accuracy too.
      So yeah, for solid stress results around welds, detailed modeling and mesh tweaks go a long way.

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Simulating shear and bending on a welded tow hook bracket
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