Effects of the shape of small flaws and damage due to a focused ion beam on the fatigue strength characteristics of annealed medium‑carbon steel

Junji Sakamoto; Shigeru Hamada; Hiroshi Noguchi

doi:10.1016/j.engfailanal.2018.02.005

Effects of the shape of small flaws and damage due to a focused ion beam on the fatigue strength characteristics of annealed medium‑carbon steel

Junji Sakamoto, Shigeru Hamada, Hiroshi Noguchi

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

2 Citations (Scopus)

Abstract

Fatigue tests and hardness tests were conducted in order to clarify the effects of the shapes of small flaws and damage caused by a focused ion beam (FIB) on the fatigue strength characteristics of annealed medium‑carbon steel. The notch root radius of the flaw at the branch point dominates the type of the fatigue limit and was found to be approximately 50 μm, a value that was significantly smaller than the 500 μm of two-dimensional notches in steel. The effect of the FIB-damaged layer on fatigue crack initiation from the FIB-milled notch in the steel was negligible. Moreover, the present study indicated that the effect of the FIB-damaged layer on the fatigue crack initiation at the FIB-milled notch could be evaluated simply by using a hardness test for the other materials and FIB conditions.

Original language	English
Pages (from-to)	49-68
Number of pages	20
Journal	Engineering Failure Analysis
Volume	87
DOIs	https://doi.org/10.1016/j.engfailanal.2018.02.005
Publication status	Published - May 2018
Externally published	Yes

Keywords

Damaged layer
Fatigue strength
Focused ion beam
Small fatigue crack behavior
Small flaw

ASJC Scopus subject areas

Materials Science(all)
Engineering(all)

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10.1016/j.engfailanal.2018.02.005

Cite this

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title = "Effects of the shape of small flaws and damage due to a focused ion beam on the fatigue strength characteristics of annealed medium‑carbon steel",

abstract = "Fatigue tests and hardness tests were conducted in order to clarify the effects of the shapes of small flaws and damage caused by a focused ion beam (FIB) on the fatigue strength characteristics of annealed medium‑carbon steel. The notch root radius of the flaw at the branch point dominates the type of the fatigue limit and was found to be approximately 50 μm, a value that was significantly smaller than the 500 μm of two-dimensional notches in steel. The effect of the FIB-damaged layer on fatigue crack initiation from the FIB-milled notch in the steel was negligible. Moreover, the present study indicated that the effect of the FIB-damaged layer on the fatigue crack initiation at the FIB-milled notch could be evaluated simply by using a hardness test for the other materials and FIB conditions.",

keywords = "Damaged layer, Fatigue strength, Focused ion beam, Small fatigue crack behavior, Small flaw",

author = "Junji Sakamoto and Shigeru Hamada and Hiroshi Noguchi",

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T1 - Effects of the shape of small flaws and damage due to a focused ion beam on the fatigue strength characteristics of annealed medium‑carbon steel

AU - Sakamoto, Junji

AU - Hamada, Shigeru

AU - Noguchi, Hiroshi

PY - 2018/5

Y1 - 2018/5

N2 - Fatigue tests and hardness tests were conducted in order to clarify the effects of the shapes of small flaws and damage caused by a focused ion beam (FIB) on the fatigue strength characteristics of annealed medium‑carbon steel. The notch root radius of the flaw at the branch point dominates the type of the fatigue limit and was found to be approximately 50 μm, a value that was significantly smaller than the 500 μm of two-dimensional notches in steel. The effect of the FIB-damaged layer on fatigue crack initiation from the FIB-milled notch in the steel was negligible. Moreover, the present study indicated that the effect of the FIB-damaged layer on the fatigue crack initiation at the FIB-milled notch could be evaluated simply by using a hardness test for the other materials and FIB conditions.

AB - Fatigue tests and hardness tests were conducted in order to clarify the effects of the shapes of small flaws and damage caused by a focused ion beam (FIB) on the fatigue strength characteristics of annealed medium‑carbon steel. The notch root radius of the flaw at the branch point dominates the type of the fatigue limit and was found to be approximately 50 μm, a value that was significantly smaller than the 500 μm of two-dimensional notches in steel. The effect of the FIB-damaged layer on fatigue crack initiation from the FIB-milled notch in the steel was negligible. Moreover, the present study indicated that the effect of the FIB-damaged layer on the fatigue crack initiation at the FIB-milled notch could be evaluated simply by using a hardness test for the other materials and FIB conditions.

KW - Damaged layer

KW - Fatigue strength

KW - Focused ion beam

KW - Small fatigue crack behavior

KW - Small flaw

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Effects of the shape of small flaws and damage due to a focused ion beam on the fatigue strength characteristics of annealed medium‑carbon steel

Abstract

Keywords

ASJC Scopus subject areas

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