基于数字图像技术的C/SiC复合材料拉伸行为与失效机制  

Tensile behavior and failure mechanism of C/SiC composite based on digital image technology

作　　者：黄鲛 陈婧旖 罗磊 李玉军[1] 张毅 李斌 HUANG Jiao;CHEN Jingyi;LUO Lei;LI Yujun;ZHANG Yi;LI Bin(Institute of Electrical and Mechanical,Northwestern Polytechnical University,Xi’an 710072,China;Beijing Institute of Aerospace Long March Vehicle,Beijing 100076,China;Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University,Xi’an 710072,China;The Sixth Military Representative Office of the Rocket Force Equipment Department in Xi’an,Xi’an 710072,China)

机构地区：[1]西北工业大学机电学院,西安710072 [2]北京航天长征飞行器研究所,北京100076 [3]西北工业大学超高温结构复合材料重点实验室,西安710072 [4]火箭军装备部驻西安地区第六军事代表室,西安710072

出　　处：《复合材料学报》2022年第5期2387-2397,共11页Acta Materiae Compositae Sinica

基　　金：国家自然基金(11902256);陕西省自然基金(2019JQ-479);国家自然科学基金(51802263);国家科技重大专项(2017-VI-0007-0077);中国博士后基金(2019M660254)。

摘　　要：本文通过二维平纹编织C/SiC复合材料的准静态单轴拉伸试验的数字图像相关(DIC)技术分析,研究损伤与应变的关系及最大应变处与断裂位置的关系。通过对材料的孔隙分析及断口分析,探究材料在损伤演化过程中内部结构的变化。结果表明,拉伸载荷作用下,材料的应变并不均匀。而层与层间损伤差异及相互影响导致最大应变位置一直变化。随着损伤的不断累积,最大应变位置处先发生断裂;材料的断裂失效位置往往与其结构薄弱程度及应力应变水平密切相关;断裂瞬间,多重拔出机制及各层结构差异性导致层与层的失效位置不同,造成分层失效。The relationship between the damage and strain as well as the relationship between the maximum strain and fracture position were investigated by the quasi-static uniaxial tensile test of plain weave C/SiC composite using digital image correlation(DIC)technology analysis.The variation of material’s internal structure during the damage evolution has been explored by analyzing the material’s pore and fracture.The results show that the strain of the material under tensile load is not well-distributed.The damage difference between layers and their interaction result in the constant variation of maximum strain position.With the accumulation of damage,fracture occurs first to the position of maximum strain and the fracture failure location of this material is often closely related to its structural weakness and the stress and strain level.At the moment of material fracture,the multiple pull-out mechanism and the structural difference in each of layers lead to different failure positions among layers,resulting in delamination failure.

关 键 词：平纹编织C/SIC复合材料 最大应变位置 断裂位置 损伤演化 分层失效 

分 类 号：TB332[一般工业技术—材料科学与工程]