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American Society for Testing and Materials

Assessment of the integrity of structures containing defects

Our safety, comfort and peace of mind are heavily dependent upon our capability to prevent, predict or postpone the failure of components and structures on the basis of sound physical principles While the external loadings acting on a material or component are clearly important, There are other contributory factors including unfavourable materials microstructure, pre-existing defects and residual stresses Residual stresses can add to, or subtract from, the applied stresses and so when unexpected failure occurs it is often because residual stresses have combined critically with the applied stresses, or because together with the presence of undetected defects they have dangerously lowered the applied stress at which failure will occur Consequently it is important that the origins of residual stress are understood, opportunities for removing harmful or introducing beneficial residual stresses recognized, their evolution in-service predicted, their influence on failure processes understood and safe structural integrity assessments made, so as to either remove the part prior to failure, or to take corrective action to extend life This paper reviews the progress in these aspects in the light of the basic failure mechanisms

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Residual stress and its role in failure

Review of limit loads of structures containing defects

Engineering critical analyses to BS 7910 — the UK guide on methods for assessing the acceptability of flaws in metallic structures

The assessment of defects in structures of strain hardening material

Introduction. Processes of deformation and fracture at high temperatures. Stress analysis of uncracked bodies. Stress analysis of cracked bodies. Models for creep crack initiation and growth. Creep-fatigue crack growth. Experimental determinations of high temperature crack growth. Practical applications. Index.

High Temperature Component Life Assessment

Review on fracture and crack propagation in weldments - A fracture mechanics perspective

This paper describes a preliminary examination of the effect of in-plane constraint on creep crack growth under widespread creep conditions using the Q stress. Plane strain is assumed. Damage models for fracture of the process zone based on both ductility exhaustion and stress rupture are shown to predict a variation of the crack growth rate with Q. Lower levels of constraint lead to lower crack growth rates for a given C*. The results are used to outline a high temperature failure assessment diagram approach to constraint-dependent creep crack growth.

Robert A. Ainsworth

Papers

Assessment of the integrity of structures containing defects

The assessment of defects in structures of strain hardening material

High Temperature Component Life Assessment

Review on fracture and crack propagation in weldments - A fracture mechanics perspective

The effect of constraint on creep fracture assessments