A Plastic-Strain, Mean-Stress Criterion for Ductile Fracture

[+] Author and Article Information
D. M. Norris, B. Moran, D. F. Quiñones

Lawrence Livermore Laboratory, University of California, Livermore, Calif. 94550

J. E. Reaugh

Science Applications Incorporated, Oakland, Calif. 94621

J. Eng. Mater. Technol 100(3), 279-286 (Jul 01, 1978) (8 pages) doi:10.1115/1.3443491 History: Received December 22, 1977; Revised May 08, 1978; Online August 17, 2010


We describe a computer model for predicting ductile-fracture initiation and propagation. The model is based on plastic strain. Fracture starts or a crack extends when the integrated product of the equivalent plastic-strain increment and a function of the mean stress exceeds a critical value over a critical length. This critical length is characteristic of the microstructure of the material. The computer fracture model is calibrated by computer simulation of simple and notched round-bar tension tests and a precracked compact tension test. The model is then used to predict fracture initiation and propagation is the standard Charpy V-notch specimen. The computed results are compared with experiments. The model predicts fracture toughness from tests of standard surveillance specimens from nuclear-reactor pressure vessels and can be applied to fracture calculations for these vessels.

Copyright © 1978 by ASME
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