Fracture characteristics and in-situ damage mechanism of PIP-C/SiC composites to various temperatures and loading velocities

作     者：Zhao, Guicheng Jiang, Zhonghe Qu, Zhaoliang Xi, Huifeng Ai, Shigang 

作者机构：Beijing Inst Technol Inst Adv Struct Technol Beijing 100081 Peoples R China Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China 

出 版 物：《ENGINEERING FRACTURE MECHANICS》 (工程断裂力学)

年 卷 期：2023年第286卷第1期

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Natural Science Foundations of China [52032003  12027901] 

主　　题：C SiC composites High temperature Mechanical properties In -situ tension Failure mechanism 

摘      要：C/SiC composites prepared by polymer infiltration and pyrolysis (PIP) are among the most promising materials for application in ultrahigh-temperature conditions. However, the mechan-ical properties and damage mechanisms of PIP-C/SiC composites at different loading velocities and temperatures have not been systematically studied. In this study, in-plane compression, bending, and in-plane shear experiments were systematically performed at different loading ve-locities and temperatures in an inert atmosphere. The ultimate strengths of the PIP-C/SiC com-posite were determined under different conditions, and the failure modes were revealed. In addition, in-situ X-ray microtomography tension experiments were conducted to study the failure mechanism of the PIP-C/SiC composite. The results showed that the ultimate strengths were considerably affected by the temperature and loading velocity, and the failure modes were dependent on experimental types. The fracture location of the PIP-C/SiC composite is affected by the defect. And the direction of crack propagation is toward the existing cracks and voids.