Abstract
The determination of optimum quasi-square hole shapes with minimum stress concentration in carbon fibre reinforced plastic (CFRP) orthotropic composite laminates under in-plane loading is an important engineering problem. It should be noted that the optimized shapes apply only to the loading conditions and specified geometric constraints considered for the given material. The present paper uses a conformal transformation to find out how much the optimized geometries could be rotated under uniaxial loading before negating the improved stress concentrations due to hole shape optimization compared with the respective circular hole.
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