Mixed‐mode I/II fracture properties and failure characteristics of microwave‐irradiated basalt: An experimental study
Zheng Yang, Tubing Yin, You Wu, Dengdeng Zhuang, Jiewen Yin, Jiexin Ma
Abstract
Abstract The notched semicircular bending samples with different microwave irradiations were subjected to 3‐point bending fracture tests under mixed‐mode I/II loading to investigate the effects of microwave irradiation on the fracture characteristics of basalt. Influences of the irradiation duration on the temperature, P‐wave velocity, and mixed‐mode I/II fracture characteristics under 2 kW power were studied. The acoustic emission device was utilized to monitor the acoustic emission signals during the destruction process. The P‐wave velocity and equivalent fracture toughness are weakened by microwave irradiation, but the ductility of basalt is enhanced by microwave irradiation. The microscopic characteristics of the treated basalts were observed by scanning electron microscope. Microwave irradiation aggravated the creation and propagation of microcracks and pores. The study of the influence of microwave irradiation on mixed‐mode I/II fracture characteristics of rock provides effective theoretical support for microwave‐assisted rock fragmentation.