A Contribution to Creep Fracture under Combined Stress System
An analytical investigation was conducted on the creep fracture of thin-walled cylinders subjected to combined tension and internal pressure, and the results were analyzed on the basis of the large strain theory. The experimental results on a 0.14% carbon steel at the test temperature of 500 °C proved the validity of the large strain theory combined with the von Mises criterion, and the time to rupture estimated by the large strain theory was in good agreement with the experimental results.
On the other hand, in the case of a material with less ductility, the large strain theory is not further applicable to its creep fracture. For instance, an 18-8 Nb austenitic stainless steel tested at 650 °C exhibited grain-boundary cracks, which were distributed uniformly on the surface of the specimen and were progressing perpendicular to the axis of the maximum tensile stress. The results imply that the criterion for creep fracture is closely related to the crack initiation and propagation.
Experimental study on creep fracture of cylinders under internal pressure were also conducted. The results were used to discuss on the criterion of the fracture. It was concluded that the mean diameter formula is valid for the design formula of pressure vessels and tubes irrespective of materials, wall-thickness and working conditions.
KeywordsInternal Pressure Stress Ratio Maximum Tensile Stress Rupture Life Simple Tension
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- Finnie, I., and W. R. Heller: Creep of Engineering Materials. New York: McGraw-Hill. 1959.Google Scholar
- Johnson, A. E.: Metallurgical Rev. 5, 447 (1960).Google Scholar
- Odqvist, F. K. G., and J. Hult: Creep Strength of Metallic Materials. Berlin- Göttingen-Heidelberg: Springer. 1961. In German.Google Scholar
- Odqvist, F. K. G.: Mathematical Theory of Creep and Creep Rupture. London: Oxford University Press. 1966.Google Scholar
- Siegfried, W.: J. Appl. Mech. 10, 202 (1943).Google Scholar
- Johnson, A. E., and N. E. Frost: Engineer. 191, 434 (1951).Google Scholar
- Johnson, A. E., J. Henderson, and V. D. Mathur: ibid. 202, 261, 299 (1956).Google Scholar
- Hoff, N. J.: J. Appl. Mech. 20, No. 1, 105 (1953).Google Scholar
- Taira, S., R. Ohtani, and A. Ishisaka: Proc. 11th Japan Congr. on Material Research, Soc. Mat. Sci., Kyoto, 76 (1968).Google Scholar
- Taira, S., R. Koterazawa, and R. Ohtani: Proc. 8th Japan Congr. on Testing Materials, Soc. Mat. Sci., Kyoto, 53 (1965).Google Scholar
- Rimrott, F. P. J.: Trans. ASME, Ser. E, 81, 271 (1959).Google Scholar
- Rimrott, F. P. J., F. J. Mills, and J. Marin: ibid. 82, 303 (1960).Google Scholar
- Lode, W.: Forsch. Gebiete Ingenieurw. 808 (1928).Google Scholar
- Taira, S., and R. Ohtani: Bulletin of JSME 11, No. 46, 593 (1968).Google Scholar
- Buxton, W. J., and W. R. Burrows: Trans. ASME 78, 575 (1951).Google Scholar
- Burrows, W. R., R. Michel, and A. W. Rankin: ibid. 76, 427 (1954).Google Scholar
- Davis, E. A.: Trans. ASME, Ser. D, 82, No. 2, 453 (1960).Google Scholar
- Tucker, T. J., Jr., E. E. Coulter, and L. F. Kooistra: ibid., 465.Google Scholar
- Ohnami, M., and Y. Awaya: Proc. 6th Japan Congr. on Testing Materials, 61 (1962).Google Scholar
- Ikejima, T., et al.: J. J. pan Soc. Mech. Test. 11, No. 102, 165 (1962).Google Scholar
- Rowe, G. H., J. R. Stewart, and K. N. Burgess: Trans. ASME, Ser. D, 85, No. 1, 71 (1963).Google Scholar
- Shinoda, N., et al.: J. J. pan Soc. Mech. Test. 14, No. 137, 78 (1965).Google Scholar
- Taira, S., and R. Ohtani: J. J. pan Soc. Mech. Engr. 70, No. 587 1737 (1967).Google Scholar
- Carlson, W. B., and D. Duval: Engineering 198, 829 (1962).Google Scholar
- Chitty, A., and D. Duval: Joint Int. Conf. on Creep, New York, No. 4–1 (1963).Google Scholar