缝合式三维编织C/SiC复合材料拉伸加卸载力学行为  

Mechanical behavior of sutured 3D-C/SiC braided composite under cycle tensile loading

作　　者：张根西 张培伟[1,2] 李彦斌[1,3] 郭飞[1,2] 董萼良[1,2] ZHANG Genxi;ZHANG Peiwei;LI Yanbin;GUO Fei;DONG Eliang(Institute of Aerospace Machinery and Dynamics,Southeast University,Nanjing 211189,China;Department of Engineering Mechanics,Southeast University,Nanjing 211189,China;School of Mechanical Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学空天机械动力学研究所,南京211189 [2]东南大学工程力学系,南京211189 [3]东南大学机械工程学院,南京211189

出　　处：《复合材料学报》2019年第12期2894-2901,共8页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(11802059);江苏省自然科学基金(BK20170656)

摘　　要：本文通过开展缝合式三维编织C/SiC复合材料的准静态单轴拉伸及循环加卸载试验,研究加卸载行为对复合材料的损伤及材料内部能量耗散的影响。通过对材料的断口分析,探究加卸载对材料破坏强度的影响规律。结果表明,加卸载行为会消耗材料内部的能量,对纤维束与基体之间的界面造成损伤,进而降低材料的承载能力;材料滞回曲线的面积随着卸载点应力的增大而增大;材料的整体失效属于脆性破坏,复合材料断口表现出明显的分层现象,且单轴拉伸时断口相对于循环加卸载更整齐。Quasi-static uniaxial tension and cyclic loading/unloading tests of the sutured 3D-C/SiC braided compos-ites were carried out to research the effects of cycle loading/unloading behavior on the damage and inner energy dissi-pation.Through the fractography analysis of this material,the effect law of the strength change caused by cycle loading/unloading has been explored.The results show that the behavior of cycle loading/unloading will consume energy of interface between matrix and fiber bundle inside the material,resulting in damage to it,which reduces the load-bearing capacity of the material,and the area of hysteresis loop increases as the stress of each unloading point increa-ses.The overall failure of this material is brittle failure,but the fracture of the sample shows obvious delamination un-der monotonous loading and cycle loading,while the fracture of the uniaxial tensile specimen is more uniform.

关 键 词：C/SIC复合材料 加卸载 能量耗散 拉伸性能 失效模式 

分 类 号：TB332[一般工业技术—材料科学与工程]