SYMPOSIA PAPER Published: 01 January 1995

The Effect of Constraint Due to Out-of-Plane Stress Field on Fracture of Reactor Pressure Vessel Steel--An Experimental and Numerical Study


Recent research on crack-tip constraint on fracture, including the effect of in-plane biaxial stress fields, has led to a two-parameter elastic K-T and elasto-plastic J-Q approach to correlate fracture toughness. These approaches predict a significant influence of biaxial stress state on fracture toughness. In the case of reactor pressure vessels undergoing pressurized thermal shock (PTS), significant stresses induced parallel to the crack front (out-of-plane stresses) offer additional constraint at the crack-tip. In order to evaluate the effect of this out-of-plane stress field on fracture of reactor pressure vessel steels, a unique method for testing a cruciform-type double-edge notch, DEN(T), specimen loaded in biaxial tension was developed. Three-dimensional finite-element analyses were conducted to design the specimen configuration. Details of the experimental and analytical results and the significance of the crack-tip constraint, due to biaxial stress state involving out-of-plane stresses, on the fracture toughness in the transition region are presented.

Author Information

Rudland, DL
Battelle Memorial Institute, Columbus, Ohio
Mohan, R
Battelle Memorial Institute, Columbus, Ohio
Ghadiali, ND
Battelle Memorial Institute, Columbus, Ohio
Detty, D
Battelle Memorial Institute, Columbus, Ohio
Rosenfield, AR
Battelle Memorial Institute, Columbus, Ohio
Wilkowski, GM
Battelle Memorial Institute, Columbus, Ohio
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Developed by Committee: E08
Pages: 316–343
DOI: 10.1520/STP14641S
ISBN-EB: 978-0-8031-5305-9
ISBN-13: 978-0-8031-2013-6