A phenomenological model to predict creep rupture times, based on material damage due to void growth and coalescence is presented. The model employs the Gurson-Tvergaard yield function together with the Norton-Baily power creep law. Rupture occurs at the end of a tertiary creep stage when the load-carrying capacity of the test-piece vanishes. Formulations for both uniaxial and triaxial conditions are given. Comparisons among the predictions of the present model and experiments for a vast number of data points indicate satisfactory agreement. A relation incorporating steady-state creep rate, rupture strain and rupture time is suggested. Furthermore acceptable correlation of the creep-rupture strength and creep strength to cause a specified creep strain is obtained.
Creep Rupture Due to Material Damage by Cavitation
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division June 2, 2000; revised manuscript received August 27, 2001. Associate Editor: A. M. Rajendran.
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Ragab, A. R. (March 26, 2002). "Creep Rupture Due to Material Damage by Cavitation ." ASME. J. Eng. Mater. Technol. April 2002; 124(2): 199–205. https://doi.org/10.1115/1.1446076
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