The effect of applied stress on damage mode of 3D C/C composites under bend-bend fatigue loading

作     者：LIAO XiaoLing LI HeJun XU WenFeng LI KeZhi 

作者机构：Research Center of Carbon/Carbon CompositesNational Key Laboratory of Ultrahigh Temperature CompositesNorthwestern Polytechnical UniversityXi’an 710072China Chemistry and Environment Science DepartmentChongqing University of Arts and SciencesChongqing 402160China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2007年第50卷第1期

页      面：97-102页

核心收录：

学科分类：0810[工学-信息与通信工程] 080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：the National Natural Science Foundation of China for Distinguished Young Scholars (Grant No. 50225210), the National Natu-ral Science Foundation of China (Grant No. 50372050) 

主　　题：3D C/C composites bend-bend fatigue lag loop damage mode 

摘      要：The bend-bend fatigue behavior of 3D integral braided carbon/carbon composites (3D C/C) was examined. Fatigue test was conducted under load control at a sinu-soidal frequency of 10 Hz to obtain stress-fracture cycles (S-N) relationship. The fatigue limit of the C/C was found to be 203 MPa (92% of the static flexural strength), the lag loops of fatigue load-displacement were transformed from elasticity to anelasticity and the flexibility of specimens were enhanced with increase in applied stress. It is revealed that the interfacial sliding abrasion played an important role in the fatigue failure process, and the extent and speed of sliding abrasion were con-trolled by the level of applied stress.