New Post-Yield Fracture Toughness Parameters for Engineering Materials

[+] Author and Article Information
T.-J. Wang, Z.-B. Kuang

Department of Engineering Mechanics, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China

J. Pressure Vessel Technol 117(4), 395-398 (Nov 01, 1995) (4 pages) doi:10.1115/1.2842142 History: Received January 04, 1994; Revised January 19, 1995; Online February 11, 2008


Micromechanics approach is employed to investigate the constraint effect on post-yield fracture toughness. Relationships between the conventional post-yield fracture toughness values, J1c and δc , and crack tip constraint characterized by the crack tip stress triaxiality are derived on the basis of an improved micromechanics criterion for ductile fracture. Then, new crack tip parameters Jmc and δmc (and associated new criteria for ductile fracture) are proposed, in which the effects of crack tip deformation and constraint are taken into account. Experiments show that both Jmc and δmc are material constant independent of stress state or specimen geometry. They can serve as new post-yield fracture toughness parameters to differentiate the fracture toughness of engineering materials, which provide new approaches for fracture assessments of engineering structures.

Copyright © 1995 by The American Society of Mechanical Engineers
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