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Publication - Professor Martyn Pavier

    Applying fracture mechanics to cracked components subjected to unloading


    Oliver, S, Pavier, M & Mostafavi, M, 2016, ‘Applying fracture mechanics to cracked components subjected to unloading’. in: ASME 2016 Pressure Vessels and Piping Conference: Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 24th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); Electric Power Research Institute (EPRI) Creep Fatigue Workshop. American Society of Mechanical Engineers (ASME)


    The J-integral is widely used as a fracture parameter for elastic-plastic materials. The J-integral
    describes the intensity of the stress field close to the crack tip in a
    power-law hardening material under a set of well-known restrictions.
    This study investigates what happens when one of these restrictions is
    broken, namely the requirement for no unloading to occur.

    this work, a centre-cracked plate is subjected to a single cycle of
    load in which unloading occurs. A remote tensile stress is applied, then
    released, then applied again up to and beyond its initial magnitude.
    The J-integral at each step of the analysis is calculated using
    finite element analysis. Its validity as a fracture parameter at each
    step is discussed with the aid of results from a strip yield analysis of
    the same problem. The relevance of the results in the context of
    structural integrity assessment is discussed.

    Full details in the University publications repository