Dynamic strain evolution around a crack tip under steady- and overloaded-fatigue conditions

Soo Yeol Lee; E-Wen Huang; Wanchuck Woo; Cheol Yoon; Hobyung Chae; Soon Gil Yoon

doi:10.3390/met5042109

Dynamic strain evolution around a crack tip under steady- and overloaded-fatigue conditions

Soo Yeol Lee^*, E-Wen Huang, Wanchuck Woo, Cheol Yoon, Hobyung Chae, Soon Gil Yoon

^*Corresponding author for this work

Department of Materials Science and Engineering

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

8 Scopus citations

Abstract

We investigated the evolution of the strain fields around a fatigued crack tip between the steady- and overloaded-fatigue conditions using a nondestructive neutron diffraction technique. The two fatigued compact-tension specimens, with a different fatigue history but an identical applied stress intensity factor range, were used for the direct comparison of the crack tip stress/strain distributions during in situ loading. While strains behind the crack tip in the steady-fatigued specimen are irrelevant to increasing applied load, the strains behind the crack tip in the overloaded-fatigued specimen evolve significantly under loading, leading to a lower driving force of fatigue crack growth. The results reveal the overload retardation mechanism and the correlation between crack tip stress distribution and fatigue crack growth rate.

Original language	English
Pages (from-to)	2109-2118
Number of pages	10
Journal	Metals
Volume	5
Issue number	4
DOIs	https://doi.org/10.3390/met5042109
State	Published - 12 Nov 2015

Keywords

Crack growth
Fatigue
Neutron diffraction
Overload
Stress/strain

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abstract = "We investigated the evolution of the strain fields around a fatigued crack tip between the steady- and overloaded-fatigue conditions using a nondestructive neutron diffraction technique. The two fatigued compact-tension specimens, with a different fatigue history but an identical applied stress intensity factor range, were used for the direct comparison of the crack tip stress/strain distributions during in situ loading. While strains behind the crack tip in the steady-fatigued specimen are irrelevant to increasing applied load, the strains behind the crack tip in the overloaded-fatigued specimen evolve significantly under loading, leading to a lower driving force of fatigue crack growth. The results reveal the overload retardation mechanism and the correlation between crack tip stress distribution and fatigue crack growth rate.",

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AU - Lee, Soo Yeol

AU - Huang, E-Wen

AU - Woo, Wanchuck

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AU - Chae, Hobyung

AU - Yoon, Soon Gil

PY - 2015/11/12

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N2 - We investigated the evolution of the strain fields around a fatigued crack tip between the steady- and overloaded-fatigue conditions using a nondestructive neutron diffraction technique. The two fatigued compact-tension specimens, with a different fatigue history but an identical applied stress intensity factor range, were used for the direct comparison of the crack tip stress/strain distributions during in situ loading. While strains behind the crack tip in the steady-fatigued specimen are irrelevant to increasing applied load, the strains behind the crack tip in the overloaded-fatigued specimen evolve significantly under loading, leading to a lower driving force of fatigue crack growth. The results reveal the overload retardation mechanism and the correlation between crack tip stress distribution and fatigue crack growth rate.

AB - We investigated the evolution of the strain fields around a fatigued crack tip between the steady- and overloaded-fatigue conditions using a nondestructive neutron diffraction technique. The two fatigued compact-tension specimens, with a different fatigue history but an identical applied stress intensity factor range, were used for the direct comparison of the crack tip stress/strain distributions during in situ loading. While strains behind the crack tip in the steady-fatigued specimen are irrelevant to increasing applied load, the strains behind the crack tip in the overloaded-fatigued specimen evolve significantly under loading, leading to a lower driving force of fatigue crack growth. The results reveal the overload retardation mechanism and the correlation between crack tip stress distribution and fatigue crack growth rate.

KW - Crack growth

KW - Fatigue

KW - Neutron diffraction

KW - Overload

KW - Stress/strain

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Dynamic strain evolution around a crack tip under steady- and overloaded-fatigue conditions

Abstract

Keywords

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