In order to estimate crack growth rate, it is necessary to use increments of the J-integral for both of time-independent fatigue process and time-dependent creep process. Many researchers and methodologies use C* to characterize creep crack growth and ΔJ or ΔK for fatigue crack growth, suggested are the following Refs.[1,2] This paper shows the fundamental features of J-integral in elastic, plastic and creep range. The path dependency is studied for center-cracked plate by using path integral from the large path to the small path near crack tip. The inelastic FE analysis is carried out for creep-fatigue loading, where the tensile strain is held constant to receive creep damage, and this paper shows the J-integral according to the loading histories. Also discussed are effects of the strain rate in fatigue process to affect the successive creep behavior.
Inelastic FE Analysis for J-Integral of Center-Cracked Plate in Creep-Fatigue Range
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Funai, M, Watanabe, O, & Matsuda, A. "Inelastic FE Analysis for J-Integral of Center-Cracked Plate in Creep-Fatigue Range." Proceedings of the ASME 2014 Pressure Vessels and Piping Conference. Volume 6A: Materials and Fabrication. Anaheim, California, USA. July 20–24, 2014. V06AT06A036. ASME. https://doi.org/10.1115/PVP2014-28605
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