Dz. Feng et Kd. Zhang, FINITE-ELEMENT NUMERICAL EVALUATION OF J-INTEGRAL FOR CRACKED DUCTILECYLINDERS, Engineering fracture mechanics, 46(3), 1993, pp. 481-489
The numerical computational procedures of two independent J-integral d
efinitions are described, one being the contour J-integral of Rice [J.
appl. Mech. 35, 379-386 (1968)] and the other the J-integral by energ
y release rate [C. Chen et al., Engineering Fracture Mechanics, Part 1
. National Defense Industry Publishing House, Beijing (1978)]. The val
idity of the two procedures is confirmed in the linear elastic materia
l range by comparing K(I)-values. Then, they are successfully applied
in cracked ductile cylinders by using a post-processing program to the
ADINA system. Numerical results show that the J-integral for a cracke
d ductile cylinder still follows the path independence, even though th
e material exhibits a large yield plateau in its true stress-strain cu
rve, and that the two independent J-integral definitions are equivalen
t to each other. These conclusions, at least from the viewpoint of num
erical analysis, provide a solid foundation for the applicability of t
he J-concept to the safe assessment of the ductile cylinder.