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This study investigates the variation in open-hole strain/stress concentrations within the full deformation range of a ductile self-reinforced poly (ethylene terephthalate) (srPET) composite using the digital image correlation (DIC). Subsequently, DIC was applied to brittle open-hole polymethyl methacrylate (PMMA) for comparison. This demonstrated the influence of the ductility of srPET. The strain concentration factor (K ɛ ) of PMMA was constant with a full deformation range and agreed with theoretical concentration factor (K t ). By contrast, the K ɛ  of srPETs was divided into five stages based on the propagation of yield extent (beginning from the hole edge) of the specimen, starting from K t  and then increasing to the peak, followed by the lowest value.

Strain and stress concentration of ductile composites in full-range deformation by digital image correlation