FATIGUE CRACK GROWTH UNDER MIXED MODES I AND II

A. Toshimitsu Yokobori, Takeo Yokobori, Kiyoshi Sato, Kazuo Syoji

    Research output: Contribution to journalArticle

    31 Citations (Scopus)

    Abstract

    Fatigue crack growth behaviour under mixed modes I and II was studied by applying in‐phase alternating tensile and torsional loading to a thin‐walled hollow cylindrical specimen with an initial crack. In the linear region of a log‐log plot where da/dN=A(ΔK)m, da/dN at first decreases with increasing ΔK110 component and then approaches a minimum close to the value of ΔK110/ΔK10∼ 0.58; here ΔK110/ΔK10 is the ratio of the initial ΔKII to the initial ΔK1., When ΔK110/ΔK10 increases further, da/dN increases. Under shear mode, da/dN becomes higher than that under mode I. The ΔK1, and ΔK11 components during fatigue crack growth under mixed mode loading increase and decrease, respectively, with an increase in da/dN In the low crack growth rate region the fatigue crack growth rates accelerate with an increase of the initial ΔK11 component, ΔK110. Fatigue life increases with increase of ΔK110/ΔK10 under the test condition of equivalent stress range being kept constant and the pre‐crack length being the same.

    Original languageEnglish
    Pages (from-to)315-325
    Number of pages11
    JournalFatigue & Fracture of Engineering Materials & Structures
    Volume8
    Issue number4
    DOIs
    Publication statusPublished - 1985 Apr

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

    Fingerprint Dive into the research topics of 'FATIGUE CRACK GROWTH UNDER MIXED MODES I AND II'. Together they form a unique fingerprint.

  • Cite this