Behavior of small cracks under negative stress ratio fatigue loading

A. Roiko, J. Solin, H. Hänninen

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    In this paper we analyze growth of small cracks initiated from microscopic notches and loaded near the growth threshold under different stress ratios. The results of in-situ optical measurements during high cycle fatigue testing show that small cracks initiate and grow quickly after which there is a long period of slow growth until the large crack growth threshold is reached. The crack growth rate data from different loading ratios indicates that the positive portion of the stress amplitude or the maximum stress intensity factor can be used to compare crack growth rates. The test data also shows that increasing only the compressive stress portion of the loading will cause an arrested small crack to grow again.
    Original languageEnglish
    Pages (from-to)379-388
    Number of pages10
    JournalInternational Journal of Fatigue
    Volume104
    DOIs
    Publication statusPublished - 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Fatigue
    Crack Growth Rate
    Crack propagation
    Crack
    Fatigue of materials
    Cracks
    High Cycle Fatigue
    In Situ Measurements
    Optical Measurement
    Fatigue testing
    Notch
    Crack Growth
    Stress Intensity Factor
    Compressive stress
    Stress intensity factors
    Testing

    Cite this

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    abstract = "In this paper we analyze growth of small cracks initiated from microscopic notches and loaded near the growth threshold under different stress ratios. The results of in-situ optical measurements during high cycle fatigue testing show that small cracks initiate and grow quickly after which there is a long period of slow growth until the large crack growth threshold is reached. The crack growth rate data from different loading ratios indicates that the positive portion of the stress amplitude or the maximum stress intensity factor can be used to compare crack growth rates. The test data also shows that increasing only the compressive stress portion of the loading will cause an arrested small crack to grow again.",
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    Behavior of small cracks under negative stress ratio fatigue loading. / Roiko, A.; Solin, J.; Hänninen, H.

    In: International Journal of Fatigue, Vol. 104, 2017, p. 379-388.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Behavior of small cracks under negative stress ratio fatigue loading

    AU - Roiko, A.

    AU - Solin, J.

    AU - Hänninen, H.

    PY - 2017

    Y1 - 2017

    N2 - In this paper we analyze growth of small cracks initiated from microscopic notches and loaded near the growth threshold under different stress ratios. The results of in-situ optical measurements during high cycle fatigue testing show that small cracks initiate and grow quickly after which there is a long period of slow growth until the large crack growth threshold is reached. The crack growth rate data from different loading ratios indicates that the positive portion of the stress amplitude or the maximum stress intensity factor can be used to compare crack growth rates. The test data also shows that increasing only the compressive stress portion of the loading will cause an arrested small crack to grow again.

    AB - In this paper we analyze growth of small cracks initiated from microscopic notches and loaded near the growth threshold under different stress ratios. The results of in-situ optical measurements during high cycle fatigue testing show that small cracks initiate and grow quickly after which there is a long period of slow growth until the large crack growth threshold is reached. The crack growth rate data from different loading ratios indicates that the positive portion of the stress amplitude or the maximum stress intensity factor can be used to compare crack growth rates. The test data also shows that increasing only the compressive stress portion of the loading will cause an arrested small crack to grow again.

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    U2 - 10.1016/j.ijfatigue.2017.07.006

    DO - 10.1016/j.ijfatigue.2017.07.006

    M3 - Article

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    EP - 388

    JO - International Journal of Fatigue

    JF - International Journal of Fatigue

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