More basic approach to the analysis of multiple specimen R-curves for determination of J/sub c/
Multiple specimen J-R curves were developed for groups of 1T compact specimens with different a/W values and depth of side grooving. The purpose of this investigation was to determine J/sub c/ (J at onset of crack extension) for each group. Judicious selection of points on the load versus load-line deflection record at which to unload and heat tint specimens permitted direct observation of approximate onset of crack extension. It was found that the present recommended procedure for determining J/sub c/ from multiple specimen R-curves, which is being considered for standardization, consistently yielded nonconservative J/sub c/ values. A more basic approach to analyzing multiple specimen R-curves is presented, applied, and discussed. This analysis determined J/sub c/ values that closely corresponded to actual observed onset of crack extension.
- Research Organization:
- Hanford Engineering Development Lab., Richland, WA (USA)
- DOE Contract Number:
- AC14-76FF02170
- OSTI ID:
- 5186628
- Report Number(s):
- HEDL-SA-2139; CONF-800673-1; TRN: 80-013668
- Resource Relation:
- Conference: 13. national symposium on fracture mechanics, Philadelphia, PA, USA, 8 Jun 1980
- Country of Publication:
- United States
- Language:
- English
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