Path dependence of J in three numerical examplesThree cracked geometries are studied with the aid of a new finite element model. The procedure employs a variable singularity at the crack tip that tracks changes in the material response during the loading process. Two of the problems are tension-loaded center-crack panels and the other is a three-point bend specimen. Results usually agree with other numerical and analytical analyses, except the finding that J is path dependent as a substantial plastic zone develops. Credible J values are obtained near the crack tip and J shows a significant increase as the radius of J path increases over two orders of magnitude. Incremental and deformation theories are identical provided the stresses exhibit proportionality found in the far field stresses but not near the tip.
Document ID
19800039712
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Karabin, M. E., Jr. (Westinghouse Electric Corp. Advanced Reactors Div., Madison, Pa., United States)
Swedlow, J. L. (Carnegie-Mellon University Pittsburgh, Pa., United States)