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| AN INVESTIGATION OF DETERMINING J_(Ic) AND J_(Iscc) BY THE CANTILEVER BEAM METHOD |
| Res. GP. of Fracture; Institute of Metal Research |
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Cite this article:
Res. GP. of Fracture; Institute of Metal Research. AN INVESTIGATION OF DETERMINING J_(Ic) AND J_(Iscc) BY THE CANTILEVER BEAM METHOD. Acta Metall Sin, 1977, 13(z1): 122-128.
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Abstract The delayed failure of a steel structure occurs as a result of the stress cor-rosion cracking and hydrogen embrittlement and similar brittle fracture mayalso happen at the site of the fatigue or weld cracks. The prediction of suchfailures has attracted the attention of many investigators. The concepts of J-integral in elastic-plastic mechanics have been introducedto investigate the delayed failure, and the method which can determine thecritical values of J-integral J_(Ic) and the threshold values of stress corrosioncracking J_(Iscc) with a cantilever beam bend specimen having a fatigue crackintroduced artificially has been proposed. The J_(Ic) and J_(Iscc) values for 40CrNiMosteel specimens in a solution of hydrogen sulphide have been determined. Sucha method has been examined: (1) by comparing the J(Ic) values with those obtain-ed from the three-point bend method; (2) by comparing the stress intensityfactor K_I with those which can be determined directly by linear elastic fracturemechanics. Based on the above results, the characteristics of the cantilever beammethod has been discussed.
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[1] Btown, B. F., Mater. Res. Stand., 6 (1966) , 129．
[2] 金属研究所断裂研究组,金属学报,12(1976) ,162．
[3] Kies, J. A. et al., Amer. Soc. Test. Mater., Spec. Tech. Publ. № 381, 1965, 328 |
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