Issue 41

P. Gallo et alii, Frattura ed Integrità Strutturale, 41 (2017) 456-463; DOI: 10.3221/IGF-ESIS.41.57 456 Creep behavior of V-notched components P. Gallo Department of Mechanical Engineering, Aalto University, Marine Technology, Puumiehenkuja 5A, Espoo 02150, Finland. S.M.J. Razavi, M. Peron, J. Torgersen, F. Berto Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Norway javad.razavi@ntnu.no , mirco.peron@ntnu.no , jan.torgersen@ntnu.no , filippo.berto@ntnu.no A BSTRACT . 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 stress- strain 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. K EYWORDS . Creep; V-notches; Stress fields; Stress evaluation; Strain energy density. Citation: Gallo, P., Razavi, S.M.J., Peron, M., Torgersen, J., Berto, F., Creep behavior of V- notched components, Frattura ed Integrità Strutturale, 41 (2017) 456-463. Received: 12.05.2017 Accepted: 23.07.2017 Published: 01.07.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION ue 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. Various methods have been proposed by researchers to evaluate the behavior of structural components under various loading conditions [8- 12]. The structural components show a nonlinear stress-strain response such as creep (visco-plasticity) under applied load in a high temperature environment. In presence of geometric discontinuities such as notches, localized-creep takes place in a small region near the notch root. On the other hand, non-localized (or gross) creep condition refers to situations in which the far stress field also experiences some creep which may lead to more intense creeping in the vicinity of the notch tip. D