Z-pins几何分布对其增强复合材料双悬臂梁Ⅰ型层间韧性的影响  

Effect of Z-pins distribution on mode Ⅰ delamination toughness of Z-pinned laminated double cantilever beam specimens

作　　者：孙先念[1] 刘书田[2] 

机构地区：[1]大连海事大学机电与材料工程学院,大连116026 [2]大连理工大学工程力学系,大连116023

出　　处：《复合材料学报》2007年第3期160-166,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(10502010);国家重点基础研究发展计划(973)项目(2006CB601205)

摘　　要：复合材料Z-pinning增强技术通过在层合板内嵌入体分比小于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;在分层裂纹面上引入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入。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。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.

关 键 词：Z—pinning 复合材料 双悬臂梁 层间韧性 

分 类 号：TB332[一般工业技术—材料科学与工程]