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Combined mode I-mode III fracture of a high strength low-alloy steel |
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| Authors: | J. G. Schroth J. P. Hirth R. G. Hoagland A. R. Rosenfield |
| Affiliation: | 1. Metallurgy Department, General Motors Research Laboratories, 48090, Warren, MI 2. Department of Metallurgical Engineering, The Ohio State University, 43210, Columbus, OH 3. Department of Materials Science and Engineering, Washington State University, 99164, Pullman, WA 4. Physical Metallurgy Section, Battelle Memorial Institute, 43201, Columbus, OH |
| Abstract: | Special formulations of theJ integral were used to quantify the combined mode I-mode III fracture behavior of ASTM A710 Grade A steel, a tough material which displays elastic-plastic behavior at room temperature. Experimental fracture initiation loci for two heat-treated conditions were linear inJ i-Jiii space, agreeing with analytical predictions based on linear elasticity. As commonly observed in mode I fracture behavior, large tearing modulus values accompanied largeJ values for mode I and mode III components, individually as well as for totalJ values. There was a pronounced tendency toward antiplane shear flow in the modified compact tension specimens tested. This may result from the concentration of mode III shear strains in the plane of the propagating crack as predicted by slip line theory. Shear fractures with the crack propagating at inclined angles to both load line and plate free surfaces are favored energetically over pure mode I cracks even though the total surface area formed by the latter is much smaller. |
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