Monitoring damage evolution of SiCf/PyC/SiC mini-composites using electrical resistivity: Crack opening distance and interphase retention rate based electromechanical modeling

• Published in: NDT & E international : independent nondestructive testing and evaluation 2024-10, Vol.147, p.103208, Article 103208
• Main Authors: Yu, Guoqiang, Xue, Beichen, Li, Jiaming, Ma, Wenbing, Ni, Zheng, He, Yuanhui, Xie, Chuyang, Du, Jinkang, Gao, Xiguang, Song, Yingdong
• Format: Article
• Language: English
• Subjects: Ceramic matrix composites; Damage monitoring; Electrical resistivity; Electro-mechanical behavior
• ISSN: 0963-8695
• DOI: 10.1016/j.ndteint.2024.103208

Electrical resistance is closely related to the damage of ceramic matrix composites (CMC) such as matrix crack, crack opening distance (COD), and interphase retention rate, giving it the potential to become a new non-destructive testing (NDT) technique. An electro-mechanical experiment method was designed for the tensile test of ceramic matrix mini-composites (CMMC). An optical in-situ tensile test was performed to obtain the pattern of matrix crack propagation. The result confirms that matrix crack saturation may not occur before the material fractures. An electromechanical model considering the COD was established to identify the damage situations. A new method for preparing ceramic matrix micro-composites composed of a single fiber and a single-layer pyrolytic carbon (PyC) interphase was realized. The accurate in-situ resistivity of the PyC was measured based on the micro-composites. •Using time-varying resistance signals to monitor matrix crack propagation.•The interphase retention rate has a huge impact on the resistance during damage.•Measured the in-situ PyC resistivity based on ceramic matrix micro-composites.