Abstract
The crack initiation and growth in single-edge notched unidirectional T800s/3900-2 carbon fiber reinforced polymer composites (CFRP) are studied under stress wave and quasi-static loading conditions. The reflection-mode Digital Gradient Sensing (or, r-DGS) is extended here to study fracture mechanics of fiber reinforced composites by using it in conjunction with ultrahigh-speed photography to perform full-field measurement of crack-tip deformations in the pre- and post-crack initiation regimes. The optical method is capable of measuring two orthogonal surface slopes in the crack-tip vicinity as angular deflections of light rays in two mutually perpendicular planes due to crack-tip deformations. The effect of fiber orientation of 0°–60° relative to the initial notch in different composite coupons and the effect of different loading rates are investigated. Nominally mode-I fracture occurs when the fiber orientation is 0° whereas mixed-mode (mode-I and -II) fracture ensues in others. The fiber bridging effects are quite evident in the energy release rate histories, which conveys that fracture behavior of CFRP with dynamic loading producing a weaker post-initiation response relative to the quasi-static counterparts.KeywordsCarbon fiber reinforced polymer compositesLoading rate effectsDynamic fractureCrack growth behaviorDigital Gradient Sensing
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