2.5D机织复合材料双剪连接力学行为与损伤机制  

Tensile mechanical behavior and damage mechanism of 2.5D woven composite with double-shear connection

作　　者：钱坤[1] 江昊 张典堂[1] QIAN Kun;JIANG Hao;ZHANG Diantang(School of Textile Science and Engineering,Jiangnan University,Wuxi 214122,Jiangsu Province,China)

机构地区：[1]江南大学生态纺织教育部重点实验室,江苏无锡214122

出　　处：《天津工业大学学报》2024年第3期9-15,22,共8页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(12072131);江苏省优秀青年基金资助项目(BK20211583)。

摘　　要：为研究装配参数对2.5D机织复合材料连接性能的影响,制备了具有不同宽径比w/D与边径比e/D的2.5D机织复合材料试样,通过双搭接拉伸实验,分析了在连接载荷下材料的力学行为与失效模式,并借助微计算机断层扫描技术(Micro-CT)观察试样内部损伤情况,阐明其损伤机制。结果表明:试样在w/D和e/D分别取6和3时,表现出较高的力学性能,但适当减少w/D或e/D依旧能保有相当强度,当w/D下降为4时,刚度减少3.18%,极限挤压强度减少2.77%;当e/D下降为2.5时,刚度与强度分别减少1.62%和7.19%;螺栓孔的位置参数对材料的失效模式影响显著,减小w/D使经纱承受更多载荷,失效模式向净张力失效演变;减小e/D使纬纱承受更多载荷,失效模式向撕裂失效演变。In order to clarify the influence of assembly parameters on the connection performance of 2.5D woven composite materials,specimens with different width-to-diameter ratios(w/D)and edge-to-diameter ratios(e/D)were prepared.The mechanical behavior and failure modes of the materials under double-lap tensile loads were analyzed,and the internal damage of the specimens was visualized using Micro-CT technology to elucidate the damage mechanism.The results showed that the composites could obtain higher mechanical properties when the hole was made with w/D of 6 and e/D of 3.However,reducing w/D or e/D appropriately could still maintain comparable strength.When w/D decreased to 4,the material decreased of 3.18%in stiffness and 2.77%in ultimate compressive strength.And the material decreased of 1.62%in stiffness and 7.19%in strength when e/D decreased to 2.5.The location parameters of the bolt hole would affect the failure mode of the material.Reducing w/D made the warp yarn bear more load and the failure mode evolved towards net-tension failure,while reducing e/D made the weft yarn bear more load and the failure mode evolved towards tearing failure.

关 键 词：2.5D机织复合材料 螺栓连接 微计算机断层扫描技术(Micro-CT) 复合材料失效 损伤机制 

分 类 号：TS105.11[轻工技术与工程—纺织工程] TB334[轻工技术与工程—纺织科学与工程]