Stress-holding time effects on creep-fracture cracking in a notched specimen

Kikuchi Kenji; Yokobori Toshimitsu; Futakawa Masatoshi; Muto Yasushi; Yokobori Takeo

doi:10.1016/0013-7944(87)90228-1

Stress-holding time effects on creep-fracture cracking in a notched specimen

Kikuchi Kenji, Yokobori Toshimitsu, Futakawa Masatoshi, Muto Yasushi, Yokobori Takeo

Research output: Contribution to journal › Article › peer-review

Abstract

The cracking behavior of Ni-based heat-resisting alloy was investigated in a vacuum environment at 1073 K using the double-edged notch specimens, with varying the stress-holding time T_h and the stress-rising time T_r during the cycle. The results showed that the crack initiation was only time-dependent regardless of T_r and T_h. The stress-rising time in the creep-fatigue mode had only a pausing effect against the creep damage because the crack initiation time in the fatigue mode was much longer than that in the creep mode. Although the crack growth was also time-dependent in the fatigue mode of T_r ≧ 6 s, it was rather cyclic-dependent in the fatigue mode of T_r = 1 s. As long as the crack initiation or growth is only time-dependent, the life of the crack initiation or growth can be evaluated by a single parameter of T_h/T_r, in the trapezoidal load wave.

Original language	English
Pages (from-to)	345-360
Number of pages	16
Journal	Engineering Fracture Mechanics
Volume	28
Issue number	3
DOIs	https://doi.org/10.1016/0013-7944(87)90228-1
Publication status	Published - 1987

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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title = "Stress-holding time effects on creep-fracture cracking in a notched specimen",

abstract = "The cracking behavior of Ni-based heat-resisting alloy was investigated in a vacuum environment at 1073 K using the double-edged notch specimens, with varying the stress-holding time Th and the stress-rising time Tr during the cycle. The results showed that the crack initiation was only time-dependent regardless of Tr and Th. The stress-rising time in the creep-fatigue mode had only a pausing effect against the creep damage because the crack initiation time in the fatigue mode was much longer than that in the creep mode. Although the crack growth was also time-dependent in the fatigue mode of Tr ≧ 6 s, it was rather cyclic-dependent in the fatigue mode of Tr = 1 s. As long as the crack initiation or growth is only time-dependent, the life of the crack initiation or growth can be evaluated by a single parameter of Th/Tr, in the trapezoidal load wave.",

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AU - Kenji, Kikuchi

AU - Toshimitsu, Yokobori

AU - Masatoshi, Futakawa

AU - Yasushi, Muto

AU - Takeo, Yokobori

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N2 - The cracking behavior of Ni-based heat-resisting alloy was investigated in a vacuum environment at 1073 K using the double-edged notch specimens, with varying the stress-holding time Th and the stress-rising time Tr during the cycle. The results showed that the crack initiation was only time-dependent regardless of Tr and Th. The stress-rising time in the creep-fatigue mode had only a pausing effect against the creep damage because the crack initiation time in the fatigue mode was much longer than that in the creep mode. Although the crack growth was also time-dependent in the fatigue mode of Tr ≧ 6 s, it was rather cyclic-dependent in the fatigue mode of Tr = 1 s. As long as the crack initiation or growth is only time-dependent, the life of the crack initiation or growth can be evaluated by a single parameter of Th/Tr, in the trapezoidal load wave.

AB - The cracking behavior of Ni-based heat-resisting alloy was investigated in a vacuum environment at 1073 K using the double-edged notch specimens, with varying the stress-holding time Th and the stress-rising time Tr during the cycle. The results showed that the crack initiation was only time-dependent regardless of Tr and Th. The stress-rising time in the creep-fatigue mode had only a pausing effect against the creep damage because the crack initiation time in the fatigue mode was much longer than that in the creep mode. Although the crack growth was also time-dependent in the fatigue mode of Tr ≧ 6 s, it was rather cyclic-dependent in the fatigue mode of Tr = 1 s. As long as the crack initiation or growth is only time-dependent, the life of the crack initiation or growth can be evaluated by a single parameter of Th/Tr, in the trapezoidal load wave.

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