Development of a standardized test procedure and an improved data reduction method for the mixed-mode I/II delamination in composite laminates

The original data reduction method in the ASTM standard D6671/D6671M-13 is established for unidirectional laminates free of fiber bridging. However, for multidirectional laminates, large-scale fiber bridging occurs in the wake of the crack-tip. Whether the original data reduction method can be applied for multidirectional laminates is questionable. This paper examines the effects of the complex failure mechanism on the flexural modulus of the...