Measurement of small cracks initiating from inclusions, Focused Ion Beam notches and drilled holes

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

The focus of this study is small crack initiation, growth and arrest from small defects in quenched and tempered steels. To study the initiation and growth threshold of microcracks from small defects a specialised test method was developed. Round bars were axially loaded at R = -1 and fatigue initiators were manufactured by drilling (Ø 50 µm) and Focused Ion Beam (FIB) milling (a = 10-50 µm). The specimens were fatigued at the range of the smooth specimen fatigue limit. The initiated microcracks were monitored to observe crack initiation; growth and arrest. The high correlation of the FIB small crack growth results with inclusion test results indicates that using a FIB notch to initiate small cracks is a good way to test small crack growth in high strength steels.
Original languageEnglish
Pages (from-to)154-158
JournalInternational Journal of Fatigue
Volume62
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Focused ion beams
Notch
Crack
Microcracks
Crack Initiation
Inclusion
Crack Growth
Cracks
Crack initiation
Crack propagation
Defects
Fatigue of materials
Fatigue Limit
High Strength Steel
Steel
Drilling
High strength steel
Fatigue
Range of data

Keywords

  • defect
  • focused ion beam
  • initation
  • small crack
  • threshold

Cite this

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title = "Measurement of small cracks initiating from inclusions, Focused Ion Beam notches and drilled holes",
abstract = "The focus of this study is small crack initiation, growth and arrest from small defects in quenched and tempered steels. To study the initiation and growth threshold of microcracks from small defects a specialised test method was developed. Round bars were axially loaded at R = -1 and fatigue initiators were manufactured by drilling ({\O} 50 µm) and Focused Ion Beam (FIB) milling (a = 10-50 µm). The specimens were fatigued at the range of the smooth specimen fatigue limit. The initiated microcracks were monitored to observe crack initiation; growth and arrest. The high correlation of the FIB small crack growth results with inclusion test results indicates that using a FIB notch to initiate small cracks is a good way to test small crack growth in high strength steels.",
keywords = "defect, focused ion beam, initation, small crack, threshold",
author = "Andrew Roiko and Jussi Solin",
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Measurement of small cracks initiating from inclusions, Focused Ion Beam notches and drilled holes. / Roiko, Andrew; Solin, Jussi.

In: International Journal of Fatigue, Vol. 62, 2014, p. 154-158.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Measurement of small cracks initiating from inclusions, Focused Ion Beam notches and drilled holes

AU - Roiko, Andrew

AU - Solin, Jussi

PY - 2014

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AB - The focus of this study is small crack initiation, growth and arrest from small defects in quenched and tempered steels. To study the initiation and growth threshold of microcracks from small defects a specialised test method was developed. Round bars were axially loaded at R = -1 and fatigue initiators were manufactured by drilling (Ø 50 µm) and Focused Ion Beam (FIB) milling (a = 10-50 µm). The specimens were fatigued at the range of the smooth specimen fatigue limit. The initiated microcracks were monitored to observe crack initiation; growth and arrest. The high correlation of the FIB small crack growth results with inclusion test results indicates that using a FIB notch to initiate small cracks is a good way to test small crack growth in high strength steels.

KW - defect

KW - focused ion beam

KW - initation

KW - small crack

KW - threshold

UR - https://www.sciencedirect.com/journal/international-journal-of-fatigue/vol/62/suppl/C

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DO - 10.1016/j.ijfatigue.2013.03.010

M3 - Article

VL - 62

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JO - International Journal of Fatigue

JF - International Journal of Fatigue

SN - 0142-1123

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