Microscopic Studies of Fractures Generated under Mixed Mode Loading
Abstract
A set of fracture profile photomicrographs is presented for fractures generated under mixed mode loading of the Pittsburgh coal. The fractal dimension is used to characterize the irregularity of these profiles and a tentative relationship is presented between the fractal dimension and the fracture toughness. Surface roughness appears to depend solely on the stress intensity and no other dependence was observed with fracture loading mode, loading rate or specimen orientation. Observations of crack bifurcations in fracture profiles can indicate crack growth direction whereas direct surface observations generally cannot in materials such as rock and coal.
Recommended Citation
R. K. Zipf and Z. T. Bieniawski, "Microscopic Studies of Fractures Generated under Mixed Mode Loading," Proceedings of the 29th U.S, Symposium on Rock Mechanics, American Rock Mechanics Association (ARMA), Jan 1988.
Meeting Name
29th U.S, Symposium on Rock Mechanics
Department(s)
Mining Engineering
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1988 American Rock Mechanics Association (ARMA), All rights reserved.
Publication Date
01 Jan 1988
