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Published July 1, 2001 | public
Journal Article Open

Effect of loading rate on fracture morphology in a high strength ductile steel


Fracture experiments in a high-strength ductile steel (2.3Ni-1.3Cr-0.17C) were conducted under static and dynamic loading conditions in a three-point bend and a one-point bend configurations. A qualitative description of the influence of loading rate on the microscopic features of the fracture surfaces and their role in the fracture initiation process was considered. The fracture surfaces consist of tunneled region and shear lips. The size of the shear lips increases wit increasing loading rate and is characterized by microvoids and cell structures. The tunneled region consists of large voids and micro-voids that coalesce by impingement. At high loading rates, localized molten zones are observed at the tunnel-shear lip interface.

Additional Information

© 2001 American Society of Mechanical Engineers. Received March 1, 2000; revised November 17, 2000. The authors acknowledge the support of the Office of Naval Research under grant no. N00014-95-0453 (Dr. G. Yoder, Scientific officer) to the California Institute of Technology.


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