Study on Fatigue Design Loads for Ships Based on Crack Growth Analysis

    Volume 1, Issue 9 (October 2004)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 4 October 2004

    Page Count: 15


    Tomita, Y
    Professor, Research Assistant, Associate Professor, and Graduate Students, Graduate School of Engineering, Osaka University, Suita, Osaka,

    Hashimoto, K
    Professor, Research Assistant, Associate Professor, and Graduate Students, Graduate School of Engineering, Osaka University, Suita, Osaka,

    Osawa, N
    Professor, Research Assistant, Associate Professor, and Graduate Students, Graduate School of Engineering, Osaka University, Suita, Osaka,

    Terai, K
    Professor, Research Assistant, Associate Professor, and Graduate Students, Graduate School of Engineering, Osaka University, Suita, Osaka,

    Wang, Y
    Professor, Research Assistant, Associate Professor, and Graduate Students, Graduate School of Engineering, Osaka University, Suita, Osaka,

    (Received 19 April 2002; accepted 17 July 2003)

    Abstract

    Although ship structural members are designed to survive 20 years, fatigue crack damage still occurs, often starting very early in the ship's life, with some cracks growing quickly to considerable size. The primary factor causing variability is the sequence of the variable amplitude load cycle, and the others are welding irregularities on the weld toe and variations in mechanical properties in the material. In this paper, the load sequence effect on fatigue life variability is examined by the use of a fatigue design procedure proposed by the authors. It is found that the fatigue lives of ship structural members vary from several months to 20 years, strongly dependent on the sequence of sea state which ships encounter during ocean-going service. The worst possible loading sequence is elucidated for the fatigue life of the ship's hull. Sensitivity study of fatigue life is discussed.


    Paper ID: JAI19046

    DOI: 10.1520/JAI19046

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    Author
    Title Study on Fatigue Design Loads for Ships Based on Crack Growth Analysis
    Symposium Fatigue Testing and Analysis Under Variable Amplitude Loading Conditions, 2002-05-31
    Committee E08