Abstract
Geometrical discontinues such as notches play a significant rule in structural integrity of the components, especially when the component is subjected to very severe conditions, such as the high temperature fatigue or creep. In this paper, a generalized form of the existing notch tip creep stressstrain analysis method developed by Nuñez and Glinka, is developed and extended to a wide variety of blunt V-notches. Assuming the generalized Lazzarin-Tovo solution that allows a unified approach to the evaluation of linear elastic stress fields in the vicinity of both cracks and notches is the key in getting the extension to blunt V-notches. Numerous cases have been analysed and the stress fields obtained according to the proposed method were compared with proper finite element data, showing a very good agreement.
Highlights
Due to the complexities of the geometry and loading conditions in modern structural components, it is essential to be able to predict the behavior of components including geometrical discontinuities that generate localized high stress concentration zones [1,7]
Non-localized creep condition refers to situations in which the far stress field experiences some creep which may lead to more intense creeping in the vicinity of the notch tip
The key to getting the extension to blunt V-notches is the substitution of the Creager and Paris [15] equations with the more general Lazzarin and Tovo [16] equations that allow an unified approach to the evaluation of linear elastic stress fields in the neighbourhood of crack and notches
Summary
Due to the complexities of the geometry and loading conditions in modern structural components, it is essential to be able to predict the behavior of components including geometrical discontinuities that generate localized high stress concentration zones [1,7]. They become even more important when, in operating conditions, the component is subjected to very demanding conditions such as high temperature fatigue or creep loading. The structural components show a nonlinear stress-strain response such as creep (visco-plasticity) under applied load in a high temperature environment. Non-localized (or gross) creep condition refers to situations in which the far stress field experiences some creep which may lead to more intense creeping in the vicinity of the notch tip
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