SEDL / STP / STP969-EB / STP33087S

Analysis of Crack Arrest Under Elastic-Plastic Conditions

Hahn, GT
Professor, graduate student, graduate student, and professor, Vanderbilt University, Nashville, TN

Bastias, PC
Professor, graduate student, graduate student, and professor, Vanderbilt University, Nashville, TN

Kumar, AM
Professor, graduate student, graduate student, and professor, Vanderbilt University, Nashville, TN

Rubin, CA
Professor, graduate student, graduate student, and professor, Vanderbilt University, Nashville, TN

Pages: 14    Published: Jan 1988

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Abstract

Elastic-plastic finite-element analyses of quasi-static crack propagation and arrest in a compact test specimen are described. The analyses evaluate the effect of the prior plastic deformation history of the propagation event on the shape of the J-resistance curve of the arrestor. In addition, experiments employing a special device are used to simulate fast fracture and arrest in small laboratory test specimens of ductile HY-80 steel and tough 7075 aluminum. The results show that large dynamic elevations of the J-curve are encountered during arrest. A relatively simple procedure for assessing or designing welded-in, steel crack arrestors, based on these findings is proposed.