Comparison of J{sub Ic} and J--R curves for short crack and tensilely loaded specimen geometries of a high strength structural steel
- Naval Academy, Annapolis, MD (United States)
- Nuclear Regulatory Commission, Washington, DC (United States)
- Naval Surface Warfare Center, Annapolis, MD (United States)
This paper describes an experimental program which had the objective of developing a series of J-R curve data from laboratory specimens of varied constraint. Constraint was varied by testing specimens with different thicknesses, crack lengths, and mode of loading. All specimens were relatively small and were kept simple in geometry and loading to allow estimation of the applied J integral. All tests were conducted on high strength structural steel, at ambient temperature, on the ductile upper shelf for this alloy. Results of these tests have shown that different constraint condition can dramatically affect the J{sub Ic} and the J-R curve for the full range of crack lengths and loading modes studied here. The results are compared in terms of the ``T Stress`` (T{sub sigma}) parameter and the Q constraint parameter, but the trends in the data do not seem to correlate well with either parameter. Although both the T{sub sigma} and Q parameters predict that the single edge notched tensile bar (SE(T)) would have relatively high constraint, this geometry .,demonstrated the highest J{sub Ic} properties. The double edge notched bars were predicted by the T{sub sigma} or Q parameters to be a low constraint geometry, however this geometry resulted in J{sub Ic} results lower than those measured on standard deeply crack bend bars.
- Research Organization:
- Nuclear Regulatory Commission, Washington, DC (United States). Div. of Engineering; Naval Academy, Annapolis, MD (United States); Naval Surface Warfare Center, Annapolis, MD (United States)
- Sponsoring Organization:
- Nuclear Regulatory Commission, Washington, DC (United States)
- OSTI ID:
- 10112410
- Report Number(s):
- NUREG/CR--5879; ON: TI93003639
- Country of Publication:
- United States
- Language:
- English
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