Abstract Extensive studies have been reported on the improvement of through-thickness reinforcement to inter-laminar performance of composite laminates; current understanding on the in-plane performance is relatively limited, although it is also concerned in industrial application. The influence of through-thickness reinforcement (Z-pinning) on the inter-fibre failure in compression of unidirectional laminates was investigated. Both unpinned and Z-pinned laminates were tested at four different off-axis angles, representing different combinations of transverse compression and in-plane shear stress. It was found that the stiffness of Z-pinned laminates decreased significantly in all off-axis angles. The failure strain and strength were reduced in shear dominated failure modes, while improved in the compression dominated failure modes by the presence of the Z-pins. A further investigation on the angle of failure plane was carried out and a comparison with analytical failure models is presented.

中文翻译：

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横向压缩和剪切载荷下全厚度增强层压板的纤维间破坏

摘要 关于提高全厚度增强复合材料层合板层间性能的研究已有大量报道；目前对面内性能的认识相对有限，但在工业应用中也受到关注。研究了全厚度增强材料（Z-pinning）对单向层压板压缩过程中纤维间失效的影响。无钉和 Z 钉层压板都在四种不同的离轴角度下进行测试，代表横向压缩和平面内剪切应力的不同组合。发现 Z-pinned 层压板的刚度在所有离轴角度都显着降低。在剪切主导的破坏模式下，破坏应变和强度降低，同时通过 Z 销的存在改善了压缩主导的故障模式。对失效平面的角度进行了进一步研究，并与分析失效模型进行了比较。