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  1. Hi all, I have recently started to learn solving with optistruct. While solving for a simple 2D shell static analysis of a plate with a hole under tensile stress, I noticed something strange. I applied tensile loads on opposite ends of the plate and did not apply any constraints at all. Optistruct solved it without errors. The displacements were obviously very large (10^9 range) owing to lack of constraints BUT the stresses were acurately calculated! Does anyone know how can optistruct recover stresses accurately with wrong displacement results?
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