中文摘要：

　复合材料z—pinning增强技术通过在层合板内嵌人体分比小于5％的z—pins，能大幅度提高层合板的层间断裂韧性，减少因低能量冲击所产生的分层损伤。本文作者基于细观力学模型，构造了相应的z—pin单元；结合梁单元，建立了用于分析含z—pins的双悬臂梁（Double　cantilever　beam，DCB）的有限元模型；在分层裂纹面上引人接触单元以防止分析过程中2个分层子梁在分层前缘处的相互嵌人。通过数值算例分析了z—pins对层间韧性增强效果的影响及其原因。数值计算结果表明，z—pins的几何分布对其增强层间韧性的影响相对较小。

英文摘要：

With less than 5 % volume fraction of through-thickness Z-pins insertion, the delamination toughness of Z-pinned laminates can be improved significantly and the delamination area induced by low-energy impact can also be reduced greatly. Based on the currently available Z-pin micro-model, a Z-pin element was developed and a beam element model for Z-pinned double cantilever beam （DCB） specimens was proposed in this paper to study the effect of Z-pins distribution on the mode I delamination toughness of Z-pinned DCB specimens. A contact element is also in- troduced to the proposed model to avoid the unrealistic penetration of the two substrate beams at the delamination crack tip. The numerical results show that the Z- pin distribution has an insignificant effect on the mode I delamination toughness of the Z-pinned laminated DCB specimens.