单边切口梁法测试针刺C/C复合材料断裂韧性  

Single edge-notched beam fracture toughness of needling C/C composites

作　　者：王富强[1,2] 嵇阿琳[1,2] 白侠[1,2] 程文[1,2] 崔红[1,2] 

机构地区：[1]西安航天复合材料研究所,西安710025 [2]高性能碳纤维制造及应用国家地方联合工程研究中心,西安710089

出　　处：《固体火箭技术》2013年第4期564-568,共5页Journal of Solid Rocket Technology

基　　金：国防基础科研项目(C0320110006)

摘　　要：采用不同切口深度和跨距的单边切口梁(SENB)法研究了针刺C/C复合材料断裂韧性,利用ABAQUS软件模拟计算材料预置裂纹尖端形成的应力大小,并观察了断口形貌。实验与模拟结果表明,SENB法测试针刺C/C复合材料断裂韧性,选取切口深度1.00 mm、跨距16 mm时,试验稳定性较好,该条件下材料断裂韧性为5.363 MPa·m1/2,离散系数仅为4.2%;受力时,裂纹源于试样预置裂纹的附近区域的孔隙、裂纹等缺陷;纤维的脱粘、桥接、断裂作用增加了扩展路径,吸收了断裂能。The fracture toughness of needling C/C composites was investigated by means of single edge-notched beam with dif- ferent span and notch depth. The stresses of the notch tip were simulated by ABAQUS software. The fracture morphologies were ob- served using scanning electron microscopy. The results show that the notch depth of 1.00 ram,the span of 16 mm were fit for test of needling C/C composites. The average fracture toughness of needling C/C composites was 5. 363 MPa·m^1/2 ,and the coefficient of variation was only 4.2%. The initiated main crack follows pores or crack which control its propagation orientation. Debonding of in- terface and fiber fracture increase cracks path and absord the fracture energy.

关 键 词：断裂韧性 针刺c c复合材料 单边切口梁法 

分 类 号：V258[一般工业技术—材料科学与工程]