Mixed Mode Testing for Fracture Toughness of Coal Based on Critical-Energy-Density
Based on the premise that understanding the fundamental mechanics of fine fragment formation in coal will lead to reducing coal dust problems in mines, a study of the mechanics of crack propagation in coal was undertaken. In one approach, theoretical models are used which describe the size of the fracture process zone which may relate to the amount of structural damage and fine fragment formation on the new crack surface. The other approach is based on the relationship between crack tip stress intensity and new surface appearance for mixed mode crack propagation. Preliminary observations with a scanning electron microscope support the premise that fine fragment formation is related to fracture surface appearance and fracture initiation conditions.
R. K. Zipf and Z. T. Bieniawski, "Mixed Mode Testing for Fracture Toughness of Coal Based on Critical-Energy-Density," Proceedings - Symposium on Rock Mechanics, American Rock Mechanics Association (ARMA), Jan 1986.
27th US Symposium on Rock Mechanics
US Natl Committee for Rock Mechanics, USA
Univ of Alabama, Tuscaloosa, AL, USA
ASCE, New York, NY, USA
Assoc of Engineering Geologists, Dallas, TX, USA
Soc of Explosives Engineers, Montville, OH, USA
Article - Conference proceedings
© 1986 American Rock Mechanics Association (ARMA), All rights reserved.
01 Jan 1986