Abstract
Abstract In this article, the mixed-mode bending test appartaus was modified in order to reduce the influence of the weight of the lever on the mixed-mode fracture toughness during the measurement. A unidirectional glass fibre reinforced polyamide 12 composite laminate was measured at G I / G II ratios of 3/1 and 1/1, by using the original and the modified MMB apparatus respectively, and the results of the mixed-mode interlaminar fracture toughness data were compared. It has been found that the modified MMB apparatus can be used to avoid the preloading on the specimens caused by the weight of the lever, and the fracture toughness can directly be calculated by applying the beam theory or the modified beam theory equations without the lever-weight correction.
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