Specimen geometry and extended-crack-growth effects on J/sub I/-R curve characteristics for HY-130 and ASTM A533B steels
An evaluation of the ductile fracture toughness and J/sub I/-R curve properties of HY-130 and ASTM A533B-HSST-03 steels in response to systematic variations of thickness and crack length in the side grooved compact specimen geometry was carried out. A series of 2T compact specimens were produced to varying thicknesses, and with various fatigue crack lengths. Elastic compliance J/sub I/-R curve test were performed, and analyses of J/sub Ic/, the slope of the J/sub I/-R curve, the accuracy of the Ernst-Paris-Landes approximation for J/sub I/, and an assessment of the criterion for J-controlled crack growth were carried out. Results showed that J/sub Ic/ of both steels was geometry independent when validity criteria were met. Both steels displayed a clear dependence of the slope of the J/sub I/-R curve as related to thickness/ligament ratio and degree of crack extension. A limiting thickness/ligament ratio of 1 is necessary to ensure a conservative J/sub I/-R-curve slope over the full range of crack growth. The Ernst-Paris-Landes expression was shown to accurately describe J/sub I/ to crack extension values of 0.4b/sub 0/ for HY-130 steel. Limited evidence suggests that a minimum value of ..omega.. to guarantee J-controlled crack growth with compact specimens in HY-130 steel is 2. 20 figures, 7 tables.
- Research Organization:
- David W. Taylor Naval Ship Research and Development Center, Annapolis, MD (USA)
- OSTI ID:
- 6265467
- Report Number(s):
- NUREG/CR-3089; ON: DE83902021
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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