The effect of strain rate on unidirectional glass fiber composites in both bridging and non-bridging scenarios

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Abstract Experimentally, the mode I delamination behaviour of unidirectional glass/epoxy composites at quasi-static strain rates of 1, 3, and 5 is explored. When comparing variation between fracture toughness GIC values at 1 mm/min and GIC at 3 mm/min, the average variation is 30% increasing. However, the average variance in GIC between 3 mm/min and 5 mm/min is 11% increasing. As a result, the crack propagation velocity has a noticeable effect on the value of GIC at lower speeds and a limited effect at higher speeds. The same comparison is made with bridging specimens for 1 and 3mm/min strain rate, the average variation is 37% reduction, which contradicts the non-bridging case. Fiber bridging causes the measured fracture toughness to be overestimated while concealing the strain rate effect, according to our findings. It is apparent that the bridging phenomena reflected the variation value in the bridging case. The specimens with a 5 mm/min strain rate, on the other hand, did not produce the expected bridging and instead operated as non-bridging specimens. The viscoelastic nature of composites can be associated these findings.

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