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A rigid body mode appearing in a finite element model indicates

  • A.The mesh is too fine
  • B.The material is too stiff
  • C.The loads are too large
  • D.The structure is under-restrained

Answer: D

An unrestrained direction leaves the model free to translate or rotate without strain, which the solver reports as a singularity or a zero-energy mode. Adding the missing restraint, rather than artificially stiffening the model, is the correct fix.

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