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",
    year = "2014",
    doi = "10.1016/j.ijfatigue.2013.03.010",
    language = "English",
    volume = "62",
    pages = "154--158",
    journal = "International Journal of Fatigue",
    issn = "0142-1123",
    publisher = "Elsevier",

    }

    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

    Y1 - 2014

    N2 - 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.

    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

    SP - 154

    EP - 158

    JO - International Journal of Fatigue

    JF - International Journal of Fatigue

    SN - 0142-1123

    ER -