Abstract
Small punch (SP) test has been utilized to analyze the neutron irradiation damage of nuclear vessels. Since this technique is easy, simple, and nondestructive, it can be applied to evaluate the mechanical properties and material degradation of in-service components. Conventional SP test has evaluated the ductile-brittle transition temperature and the equivalent fracture strain by the interpretations of load-deflection curve and the change of specimen thickness, respectively. The assumption that fracture occurs at maximum load is, however, not reasonable because the crack initiates at smaller load. In this study, in order to evaluate quantitatively fracture characteristics based on fracture mechanics, the pre-crack is introduced to SP specimen and acoustic emission is used to determine the crack initiation point. Using the load at crack initiation point, the fracture toughness of thin plate is calculated through bending theory. Therefore, the fracture characteristics of thin plate can be evalualed more reliably by using revised SP test.
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References
J. M. Baik, J. Kameda and O. Buck,Scripta metall. 17, 1443 (1983).
J. Foulds and R. Viswanathan,Trans. ASME 116, 457 (1994).
X. Mao, T. Shoji and H. Takahashi,J. Test. Eval. 15, 30 (1987).
Y.-H. Joo, I. Hashida, H. Takahashi and K. Shimomura,J. Test. Eval. 20, 336 (1992).
T. L. Anderson, inFracture Mechanics, 2nd ed., p. 265, CRC Press, Boca Raton, Florida (1995).
G. C. Sih, P. C. Paris and F. Erdogan,Trans. ASME, 306 (1962).
S. Timoshenko,Strength of Materials, Text, Part II: Advanced Theory and Problems, 3rd ed., p. 109, Van Nostrand, Princeton, NJ (1956).
X. Mao, H. Takahashi and T. Korida,Mater. Sci. Eng. A150, 231 (1992).
A. Trochidis and B. Polyzos,J. Appl. Phys. 78, 170 (1995).
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Ju, JB., Kwon, D. Assessment of fracture characteristics from revised small punch test using pre-cracked specimen. Metals and Materials 4, 742–746 (1998). https://doi.org/10.1007/BF03026391
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DOI: https://doi.org/10.1007/BF03026391