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Report No.

Experimental and analytical studies on the effect of excessive loading on fatigue crack propagation in piping materials

Yamaguchi, Yoshihito ; Katsuyama, Jinya  ; Onizawa, Kunio ; Sugino, Hideharu*; Li, Y.* ; Yagawa, Genki*

Niigata-ken Chuetsu-oki earthquake was actually happened, whose magnitude was beyond the assumed one provided in seismic design, in July 2007. Through these events, it is becoming the focus of attention to evaluate an effect of large scale earthquake while the SCC and/or fatigue-crack are assumed to piping. Many previous papers have been already published about the retardation effect on fatigue crack growth by excessive loading. The retardation effect is treated qualitatively relating to plastic strain generated by excessive loading. In this work, the crack growth after the excessive loading is evaluated for carbon steel and austenitic stainless steel. Some cyclic excessive loading patterns such as stepwise increase or decrease were applied to fatigue-crack-growth experiments. The FEM analyses were conducted to evaluate the plastic region size during such loading conditions. The PFM analyses were conducted to evaluate the retardation of crack growth influence the probability of failure.



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