Zhang Zhongwei, Li Longbiao, Chen Zhaoke
Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China.
College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No. 29 Jiangjun Ave., Nanjing 211106, China.
Materials (Basel). 2021 Mar 20;14(6):1525. doi: 10.3390/ma14061525.
In this paper, the tensile damage and fracture behavior of carbon fiber reinforced silicon carbide (C/SiC) minicomposites with single- and multiple-layer interphases are investigated. The effect of the interphase on the tensile damage and fracture behavior of C/SiC minicomposites is analyzed. The evolution of matrix cracking under the tensile load of the C/SiC minicomposite with a notch is observed using the digital image correlation (DIC) method. The damage evolution process of the C/SiC minicomposite can be divided into four main stages, namely, (1) an elastic response coupled with partial re-opening of thermal microcracking; (2) multiple matrix microcracking perpendicular to the applied loading; (3) crack opening and related fiber/matrix, bundle/matrix, and inter-bundle debonding; and (4) progressive transfer of the load to the fibers and gradual fiber failure until composite failure/fracture. On the fracture surface, a large number of fibers pulling out of the samples with both single-layer and multi-layer interphases can be clearly observed.
本文研究了具有单层和多层界面相的碳纤维增强碳化硅（C/SiC）微型复合材料的拉伸损伤和断裂行为。分析了界面相对C/SiC微型复合材料拉伸损伤和断裂行为的影响。采用数字图像相关（DIC）方法观察了带缺口的C/SiC微型复合材料在拉伸载荷作用下基体裂纹的扩展情况。C/SiC微型复合材料的损伤演化过程可分为四个主要阶段，即：（1）弹性响应与热微裂纹的部分重新张开；（2）垂直于外加载荷的多个基体微裂纹；（3）裂纹张开以及相关的纤维/基体、束/基体和束间脱粘；（4）载荷逐渐转移到纤维上并逐渐导致纤维失效直至复合材料失效/断裂。在断口表面，可以清晰地观察到大量带有单层和多层界面相的样品中的纤维拔出。
