Details
| Original language | English |
|---|---|
| Pages (from-to) | 134-145 |
| Number of pages | 12 |
| Journal | International journal of fatigue |
| Volume | 37 |
| Publication status | Published - 11 Nov 2011 |
| Externally published | Yes |
Abstract
The use of digital image correlation analysis during fatigue crack growth (FCG) of polycrystalline and [1 1 1] oriented single crystal specimens of 316L stainless steel allows for the investigation of mixed mode crack propagation in the vicinity of the crack tip. This technique offers significant benefit in addressing crack closure at the microscale compared to the large body of work studying this phenomenon at the macroscale. Understanding of FCG behavior relies on the sliding (mode II) details which can be rather complicated. In this study, the mode I (opening) and mode II (sliding) mechanisms are differentiated within the single crystal specimens for slanted cracks. Further, crack opening displacement profiles are obtained in mode I and mode II, which are used to quantify crack closure in each specimen. Finally, the irreversible strain within the plastic zone ahead of the crack tip is measured during crack propagation. The results show that [1 1 1] oriented single crystal specimen fatigued at R = -1 display the most slip irreversibilities due to reverse dislocation motion leading to dislocation kinks/jogs. As a result, residual stress is diminished at the crack tip thereby resulting in earlier crack opening within the loading cycle.
Keywords
- Crack closure, Crack opening, Fatigue crack growth, Mixed mode, Stainless steel
ASJC Scopus subject areas
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: International journal of fatigue, Vol. 37, 11.11.2011, p. 134-145.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - High resolution analysis of opening and sliding in fatigue crack growth
AU - Sangid, Michael D.
AU - Pataky, Garrett J.
AU - Sehitoglu, Huseyin
AU - Hamilton, Reginald F.
AU - Maier, Hans J.
N1 - Funding information: The research was supported by a Critical Research Initiative (CRI) at the University of Illinois and partly by the US Department of Energy Nuclear Energy University Program (NEUP) under grant DOE-INL-00091210 and a CRDF Award under grant RUE1-2983-TO-10. The authors would like to thank Prof. Yuri Chumlyakov of Siberian Physical-Technical Institute, Russia for providing the single crystal specimens.
PY - 2011/11/11
Y1 - 2011/11/11
N2 - The use of digital image correlation analysis during fatigue crack growth (FCG) of polycrystalline and [1 1 1] oriented single crystal specimens of 316L stainless steel allows for the investigation of mixed mode crack propagation in the vicinity of the crack tip. This technique offers significant benefit in addressing crack closure at the microscale compared to the large body of work studying this phenomenon at the macroscale. Understanding of FCG behavior relies on the sliding (mode II) details which can be rather complicated. In this study, the mode I (opening) and mode II (sliding) mechanisms are differentiated within the single crystal specimens for slanted cracks. Further, crack opening displacement profiles are obtained in mode I and mode II, which are used to quantify crack closure in each specimen. Finally, the irreversible strain within the plastic zone ahead of the crack tip is measured during crack propagation. The results show that [1 1 1] oriented single crystal specimen fatigued at R = -1 display the most slip irreversibilities due to reverse dislocation motion leading to dislocation kinks/jogs. As a result, residual stress is diminished at the crack tip thereby resulting in earlier crack opening within the loading cycle.
AB - The use of digital image correlation analysis during fatigue crack growth (FCG) of polycrystalline and [1 1 1] oriented single crystal specimens of 316L stainless steel allows for the investigation of mixed mode crack propagation in the vicinity of the crack tip. This technique offers significant benefit in addressing crack closure at the microscale compared to the large body of work studying this phenomenon at the macroscale. Understanding of FCG behavior relies on the sliding (mode II) details which can be rather complicated. In this study, the mode I (opening) and mode II (sliding) mechanisms are differentiated within the single crystal specimens for slanted cracks. Further, crack opening displacement profiles are obtained in mode I and mode II, which are used to quantify crack closure in each specimen. Finally, the irreversible strain within the plastic zone ahead of the crack tip is measured during crack propagation. The results show that [1 1 1] oriented single crystal specimen fatigued at R = -1 display the most slip irreversibilities due to reverse dislocation motion leading to dislocation kinks/jogs. As a result, residual stress is diminished at the crack tip thereby resulting in earlier crack opening within the loading cycle.
KW - Crack closure
KW - Crack opening
KW - Fatigue crack growth
KW - Mixed mode
KW - Stainless steel
UR - http://www.scopus.com/inward/record.url?scp=84655164273&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2011.11.001
DO - 10.1016/j.ijfatigue.2011.11.001
M3 - Article
AN - SCOPUS:84655164273
VL - 37
SP - 134
EP - 145
JO - International journal of fatigue
JF - International journal of fatigue
SN - 0142-1123
ER -