Abstract
In the present study, a detection method of an overload application during stress cycles under constant amplitude was investigated. Also, the effect of the tensile overload was shown at three stress ratios: R = 0, -1, and -1.5, to understand the effects of R on crack propagation after an overload. At the baseline of R = 0, after the overload, retardation in the crack propagation was observed, and the crack growth rate decreased. However, in the case of R = -1.5, the fatigue crack growth rate actually accelerated after the tensile overload. The detection of that crack propagation behavior was attempted through the information of the strain waveform h; h = εy + 1.2λεx, where εx and εy are the local strains at the specimen axis, and λ is the strain range ratio Δεy/Δεx. The waveform shape of h was changed after the overloading. Also, the application of the overload could be detected by the variation of the strain range ratio X Especially, the present method is useful for cases of the crack propagation stage under negative R conditions.
| Original language | English |
|---|---|
| Pages (from-to) | 56-61 |
| Number of pages | 6 |
| Journal | Journal of Testing and Evaluation |
| Volume | 32 |
| Issue number | 1 |
| Publication status | Published - 2004 Jan |
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Keywords
- Crack propagation
- Fatigue
- Overload
- Strain waveform
- Stress ratio
ASJC Scopus subject areas
- Materials Science (miscellaneous)
Cite this
Detecting Overload from Strain Information during Fatigue Crack Propagation under Negative Stress Ratio. / Makabe, Chobin; Purnowidodo, Anindito; Sueyoshi, Toshiyasu; Utsunomiya, Takao.
In: Journal of Testing and Evaluation, Vol. 32, No. 1, 01.2004, p. 56-61.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Detecting Overload from Strain Information during Fatigue Crack Propagation under Negative Stress Ratio
AU - Makabe, Chobin
AU - Purnowidodo, Anindito
AU - Sueyoshi, Toshiyasu
AU - Utsunomiya, Takao
PY - 2004/1
Y1 - 2004/1
N2 - In the present study, a detection method of an overload application during stress cycles under constant amplitude was investigated. Also, the effect of the tensile overload was shown at three stress ratios: R = 0, -1, and -1.5, to understand the effects of R on crack propagation after an overload. At the baseline of R = 0, after the overload, retardation in the crack propagation was observed, and the crack growth rate decreased. However, in the case of R = -1.5, the fatigue crack growth rate actually accelerated after the tensile overload. The detection of that crack propagation behavior was attempted through the information of the strain waveform h; h = εy + 1.2λεx, where εx and εy are the local strains at the specimen axis, and λ is the strain range ratio Δεy/Δεx. The waveform shape of h was changed after the overloading. Also, the application of the overload could be detected by the variation of the strain range ratio X Especially, the present method is useful for cases of the crack propagation stage under negative R conditions.
AB - In the present study, a detection method of an overload application during stress cycles under constant amplitude was investigated. Also, the effect of the tensile overload was shown at three stress ratios: R = 0, -1, and -1.5, to understand the effects of R on crack propagation after an overload. At the baseline of R = 0, after the overload, retardation in the crack propagation was observed, and the crack growth rate decreased. However, in the case of R = -1.5, the fatigue crack growth rate actually accelerated after the tensile overload. The detection of that crack propagation behavior was attempted through the information of the strain waveform h; h = εy + 1.2λεx, where εx and εy are the local strains at the specimen axis, and λ is the strain range ratio Δεy/Δεx. The waveform shape of h was changed after the overloading. Also, the application of the overload could be detected by the variation of the strain range ratio X Especially, the present method is useful for cases of the crack propagation stage under negative R conditions.
KW - Crack propagation
KW - Fatigue
KW - Overload
KW - Strain waveform
KW - Stress ratio
UR - http://www.scopus.com/inward/record.url?scp=1842534303&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1842534303&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:1842534303
VL - 32
SP - 56
EP - 61
JO - Journal of Testing and Evaluation
JF - Journal of Testing and Evaluation
SN - 0090-3973
IS - 1
ER -