A Mechanism of Acceleration of Fatigue Crack Growth after Applying Overload

Yamauchi, Akihiro; Makabe, Chobin; Miyazaki, Tatsujiro; Miyahara, Hisashi

doi:10.2472/jsms.60.1104

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…Where the stress ratio R was zero, the rate of crack growth da/dN was decreased or unchanged from the baseline conditions even when the crack tips were blunted by overloading. 2 However, where the stress ratio was negative, acceleration and deceleration of crack growth were observed. Such acceleration was related to the blunting of the crack tips and the application of compression stress at some critical level after overloading.…”

Section: Materials and Testing Proceduresmentioning

confidence: 99%

“…Such acceleration was related to the blunting of the crack tips and the application of compression stress at some critical level after overloading. 2 In the present study, the mechanism of such acceleration of crack growth was discussed from the viewpoints of the compression stress and blunting of the crack tips. So, we compared the crack growth of a notched specimen with 0.2 mm of notch root radius and that of a cracked specimen.…”

Section: Materials and Testing Proceduresmentioning

confidence: 99%

“…Table 1 Chemical composition of the materials: wt, % (S15C: 0.15% carbon steel, S45C: 0.45% carbon steel) Figure 1 shows the crack growth behavior of 0.15% carbon steel. 2 Figures 1 (a) and (b) show the crack lengths as a function of the number of constant amplitude cycles applied, with and without the application of the single overload. It is noted that the usual retardation phenomenon associated with an overload is observed in the cases of maximum cyclic stress S max of 67 MPa, but the retardation effect is less pronounced in the case of S max = 86 MPa and an overload level of S ol = 170 MPa.…”

Section: Materials and Testing Proceduresmentioning

confidence: 99%

“…1 However, the crack growth rate can be accelerated after applying an overload at a critical level while a tensioncompression load is being repeated. 2 The effects of an overload on the rate of fatigue crack growth at constant amplitude have been of interest for some time, and much information has been gathered through which the crack growth was retarded. However there is relatively little information concerning the effects of an overload through which the crack growth was accelerated.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Acceleration of Fatigue Crack Growth After Overload in Carbon Steel

Yamauchi¹,

Miyahara

Makabe

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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The effects of an overload on fatigue crack growth behavior have been investigated by using carbon steel. Delayed retardation and acceleration of crack growth were both observed. These phenomena depended not only on overload conditions but also on the baseline stress conditions. Moreover, the mechanical properties of the materials affected the crack growth rate after overload. It was found that crack growth accelerated when tensile residual stress was distributed in front of the crack tip. The residual stress distribution is related to the crack opening geometry at the overload stage.

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Section: Materials and Testing Proceduresmentioning

confidence: 99%

Section: Materials and Testing Proceduresmentioning

confidence: 99%

Section: Materials and Testing Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acceleration of Fatigue Crack Growth After Overload in Carbon Steel

Yamauchi¹,

Miyahara

Makabe

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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Effects of Overload and Supplying Oil on Crack Growth Behavior in Mg Alloys

2021

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A single overload was applied during the crack growth process under constant stress amplitude, and retardation of crack growth was observed in the case of magnesium alloys as well as carbon steel, aluminum alloys, etc. The retardation of crack growth was related to crack closure, the fracture surface roughness, and crack tip deformation. In addition, the effects of supplying oil into the crack on crack growth behavior of an overloaded specimen were investigated in this study. The crack growth rate in the case of supplying oil became lower than in the case without supplying oil. In the case of the magnesium alloy AZ31, powder of oxide magnesium appeared from the crack after overloading. It is one of the typical behaviors of AZ31. In the case of AZ31 and AZX912, the crack growth behavior after overloading was slightly different due to the deformation of the crack tip.

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Effects of Overload on Fatigue Crack Growth in Mg Alloys

Zhang

Mori²,

Makabe

et al. 2021

J. Soc. Mat. Sci., Japan

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Push-pull fatigue tests of rolled magnesium alloys AZ31 and AZX912 were performed with a side-notch plate specimen to examine the effect of a single overload on the crack growth behavior under a stress ratio of -1. The behavior in retardation of crack growth was unclear in the case of AZ31 because the crack growth rate was relatively higher at the overload point. However, this was observed clearly, when the branching of the crack tip happened in the case of AZX912. The geometry of the fracture surface and the changes in crack growth path were related to the crack growth behavior. The crack opening level became higher when the crack growth rate was lower. Therefore, the crack closure is related to the retardation of the crack growth rate. When the branching of a crack tip occurred, not only the residual compression stress at crack front but also the variation of local crack growth direction after overload affected the fatigue crack growth behavior.

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A Mechanism of Acceleration of Fatigue Crack Growth after Applying Overload

Cited by 3 publications

References 9 publications

Acceleration of Fatigue Crack Growth After Overload in Carbon Steel

Acceleration of Fatigue Crack Growth After Overload in Carbon Steel

Effects of Overload and Supplying Oil on Crack Growth Behavior in Mg Alloys

Effects of Overload on Fatigue Crack Growth in Mg Alloys

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