A unified comparative study on the classical lamination theory, hole drilling, slitting, and curvature measurement methods for assessment of residual stress in laminated polymeric composites

Residual stresses are balanced, non-uniform, undesirable, and often harmful in laminated polymer composite materials. Different methods developed to measure these composites. In this manuscript, three experimental measurement methods, namely ‘hole drilling’, ‘slitting’, ‘curvature’ considered, the results compared with those of classical lamination theory (CLT). It is demonstrated that hole drilling technique can be used residual stress near-surface areas structures, while slitting method employed assess through depth specimens. Moreover, curvature shows great potential for estimating overall quality composites un-symmetrical configurations.