Fatigue strength reduction of notched component in hydrogen gas after multiple overloading

Masanobu Kubota, Junichiro Yamaguchi, Yoshiyuki Kondo

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    High-cycle fatigue test after multiple overloading was performed to develop a structural integrity assessment method for hydrogen utilization machines suffered seismic load. To simulate the material used in hydrogen gas for a long period, the hydrogen charged specimen whose hydrogen concentration was 80ppm was used. Three kinds of notched specimens with different notch root radii were used. The fatigue test in air using uncharged specimen was also performed. The fatigue limit of p = 0.2mm specimen tested in air was decreased to almost one half by the application of 200 cycles overload with the amplitude of 1.25ω 0.2. The decrease was caused by the microcracks generated by the overload. The number of cycles of overload corresponded to only 0.67% of the low-cycle fatigue life for the overload. Since no reduction of the fatigue limit was observed by the overload of 0.75ω 0.2, there is a threshold value of overload that does not cause the reduction of high-cycle fatigue strength. The fatigue strength of hydrogen charged specimen tested in hydrogen gas was lower than that of uncharged specimen tested in air. Deeper microcracks were formed by the overload in the hydrogen charged specimen than in uncharged hydrogen.

    Original languageEnglish
    Title of host publication17th European Conference on Fracture 2008
    Subtitle of host publicationMultilevel Approach to Fracture of Materials, Components and Structures
    Pages1328-1335
    Number of pages8
    Publication statusPublished - Dec 1 2008
    Event17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17 - Brno, Czech Republic
    Duration: Sep 2 2008Sep 5 2008

    Publication series

    Name17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures
    Volume2

    Other

    Other17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17
    CountryCzech Republic
    CityBrno
    Period9/2/089/5/08

    All Science Journal Classification (ASJC) codes

    • Civil and Structural Engineering

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