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A model gives a peak stress at a sharp internal corner that exceeds the material's ultimate strength by ten times. The correct response is

  • A.Reduce the applied load until the stress is acceptable
  • B.Recognise the singularity, model the fillet
  • C.Report the structure as failed
  • D.Refine the mesh until the stress falls

Answer: B

The real part has a radius and the model does not, so the number is an artefact of the geometry idealisation rather than a prediction. Refining will only raise it further, since the underlying elasticity solution is unbounded there.

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