Acoustic emission and fracture characteristics of red sandstone after high-temperature treatment

• Published in: Engineering fracture mechanics 2024-08, Vol.306, p.110245, Article 110245
• Main Authors: Wang, Mengxiang, Li, Jiangteng, Shi, Zhanming, Tan, Han, Wang, Ju, Li, Kaihui
• Format: Article
• Language: English
• Subjects: Acoustic emission; Crack classification model; Critical slowing down; Cyclic load; High temperature
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/j.engfracmech.2024.110245

•The effects of high temperature and cyclic load on red sandstone were investigated.•The failure process of the specimen was analyzed in depth by AE and DIC technologies.•A crack classification model based on K-medoids and SVM algorithms was proposed.•The failure precursor characteristics were discussed by critical slowing down theory. This paper investigated red sandstone’s acoustic emission (AE) and fracture characteristics under high temperature and cyclic load. The specimen’s behavior throughout the process from stabilization to failure was systematically analyzed in terms of the distribution of AE activities, rupture scale, crack type, crack evolution, and failure mode. A crack classification model based on K-medoids and support vector machine (SVM) algorithms was proposed, and the optimal dividing line for tensile-shear cracks at different temperatures was determined as AF=0.335×RA+76.890. The specimen’s failure precursor information was recognized based on the critical slowing down theory.