STP1526

    The Influence of Elastic Follow-Up on the Integrity of Structures

    Published: Jan 2011


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    Abstract

    Based on the traditional definitions associated with creep strain accumulation in defect free components, a generalised definition for “elastic follow-up” factor, Z, is proposed that characterises the influence of a “nonlinear” event experienced locally within a structure, i.e., creep, plasticity, cracking, growth of an existing crack, or any combination of such events, on the response of the structure to the applied loading. A “crack affected zone” approach is then outlined for evaluation of this parameter in a defective component. The significance of quantifying elastic follow-up in relation to integrity assessment procedures and the challenges facing its practical implication to the codes is discussed. The approach is finally examined through its application to two example problems; a standard test geometry, centre cracked plate and an external circumferential cracked thick cylinder, i.e., a conventional structural component.

    Keywords:

    elastic follow-up, structural integrity, crack, stress classification


    Author Information:

    Hadidi-Moud, S.
    Ferdowsi Univ. of Mashhad, Mashhad,

    Smith, D. J.
    Univ. of Bristol, Bristol,


    Paper ID: STP49306S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP49306S


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