The main objective of the work was to determine the mechanical properties of Z‐pinned and unpinned composites samples. Tensile and interlaminar fracture tests under mode I have been carried out on thermoset polymer matrix composite samples composed of CYTEC 977‐2 and carbon fibre yarn HTA‐12K/35. The presence of the Z‐pins has been found to significantly increase the interlaminar fracture toughness. The crack resistance improvement has been found to be accompanied by a small reduction of the in‐plane stiffness properties for a Z‐pins density of 2%. The results are presented in relation to the size and pinning quality and are rationalised on the basis of the location of Z‐pin block within the sample.
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Lenzi et al. (2007) studied this question.
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