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Symmetry can be exploited in an idealisation only when

  • A.The material is isotropic
  • B.Structure and loading are both symmetric
  • C.The structure alone is symmetric
  • D.The loading alone is symmetric

Answer: B

A symmetric structure under asymmetric loading does not behave symmetrically, so the half model would be wrong. Where both conditions hold, half or quarter models with appropriate symmetry boundary conditions halve or quarter the work.

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