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Discussion

The overall lesson of this topic for a stress engineer is that

  • A.Finite element software removes the need for judgement
  • B.The finest available model is always the right one
  • C.Hand methods have been superseded entirely
  • D.Every model embeds assumptions

Answer: D

Correct answer: Every model embeds assumptions

Whether it is a boom and panel idealisation or a million-element finite element model, someone has decided what carries what, what may be neglected and how the structure is supported. The engineer’s task is to know what those assumptions are and where they cease to hold. Software does not remove that judgement; the finest model is not automatically the right one; and hand methods survive precisely because they make the assumptions visible.

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