SEDL / STP / STP1526-EB / STP49306S

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

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

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

Pages: 16    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.