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Fatigue properties of pre-strained structural steels
The effect of pre-strain on fatigue properties has been investigated using two kinds of typical structural plain carbon steels (S15C and S45C). The specified pre-strain was given to the specimens by the Instron-type precise tensile testing machine, and the fatigue test specimens were cut out from the pre-strained specimens without working the testing portion. Fatigue damage had been intermittently observed by the successive-taken replica method and fractographic analysis was applied to the broken specimens after fatigue test. Though the only plastic slip lines are observed in the boundary area between ferritic grain and pearlite block by the static tensile strain of 5% without crack initiation in the case of S15C, some cracks are observed in the pearlite block by the static tensile strain of epsilon p = 4.8%. The fatigue limit of S15C is somewhat lower at the pre-strain of epsilon p = 2% and becomes equal or larger than that of non-pre-strain (epsilon p = 0%) at the strain of 5 and 8%. On the other hand, the fatigue limit of S54C is remarkably lower than that of non-pre-strain at the pre-strain of epsilon p = 2, 5 and 8% respectively.
Fatigue properties of pre-strained structural steels
The effect of pre-strain on fatigue properties has been investigated using two kinds of typical structural plain carbon steels (S15C and S45C). The specified pre-strain was given to the specimens by the Instron-type precise tensile testing machine, and the fatigue test specimens were cut out from the pre-strained specimens without working the testing portion. Fatigue damage had been intermittently observed by the successive-taken replica method and fractographic analysis was applied to the broken specimens after fatigue test. Though the only plastic slip lines are observed in the boundary area between ferritic grain and pearlite block by the static tensile strain of 5% without crack initiation in the case of S15C, some cracks are observed in the pearlite block by the static tensile strain of epsilon p = 4.8%. The fatigue limit of S15C is somewhat lower at the pre-strain of epsilon p = 2% and becomes equal or larger than that of non-pre-strain (epsilon p = 0%) at the strain of 5 and 8%. On the other hand, the fatigue limit of S54C is remarkably lower than that of non-pre-strain at the pre-strain of epsilon p = 2, 5 and 8% respectively.
Fatigue properties of pre-strained structural steels
Nishida, S. (Autor:in) / Hattori, N. (Autor:in) / Zhang, W. (Autor:in) / Koga, M. (Autor:in)
1998
10 Seiten, 6 Quellen
Aufsatz (Konferenz)
Englisch
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