Interpretation of Irradiation Effects on the Fracture Toughness of a Pressure Vessel Steel in Terms of Crack Tip Stress Analysis

[+] Author and Article Information
D. M. Parks

Division of Engineering, Brown University, Providence, R. I.

J. Eng. Mater. Technol 98(1), 30-35 (Jan 01, 1976) (6 pages) doi:10.1115/1.3443332 History: Received December 16, 1974; Online August 17, 2010


The model of Ritchie, Knott, and Rice [10], relating the critical tensile stress for initiation of unstable cleavage fracture of mild steel to the cryogenic temperature-dependence of plane strain fracture toughness (KIc ), is applied to a pressure vessel steel, ASTM A533B. It is shown that the fracture criterion of achieving the critical tensile stress over a characteristic microstructural distance is essentially unaffected by neutron irradiation. Thus, it appears that the effects of irradiation on the temperature-dependence of KIc in the cleavage range can be quantitatively assessed solely in terms of the effects on the yield and flow properties of the material.

Copyright © 1976 by ASME
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