Characterisation of crack tip fields under non-uniform fatigue loading
Journal Title: Frattura ed Integrità Strutturale - Year 2013, Vol 7, Issue 25
Abstract
The paper analyses previously reported work, which uses digital image correlation to measure fatigue crack closure. As well as determining crack opening loads, the information on crack shape may be used to estimate the stress intensity factor, as well as other parameters in more complex models of crack tip fields. A number of specimens were subjected to single overload cycles, which produced a significant retardation in crack growth rate. The method previously applied to the analysis of constant amplitude loading is here used to analyse the single overload case. The stress intensity factor history is found to be very different in the two cases and the consequences of this observation for analysis of fatigue crack propagation are discussed.
Authors and Affiliations
D. Nowell, M. E. Kartal, P. E. P. de Matos
Keywords
Related Articles
- EP ID EP156660
- DOI 10.3221/IGF-ESIS.25.01
- Views 74
- Downloads 0
Effect of flexural crack on plain concrete beam failure mechanism A numerical simulation
The flexural failure of plain concrete beam occurs along with development of flexural crack on beam. In this paper by using ABAQUS, mechanism failure of plain concrete beam under three steps have been simulat...
Real-time non-contact ultrasonic detection of surface defects on objects moving at high speed
The detection of surface defects during periodic inspection is important because, usually, the stresses are higher at the surface, thus affecting the growth of the discontinuity. Surface defects can be detected usi...
Sharp contact corners, fretting and cracks
Contacts with sharp edges subject to oscillatory loading are likely to nucleate cracks from the corners, if the loading is sufficiently severe. To a first approximation, the corners behave like notches, where the local e...
Study of spatial-time inhomogeneity of serrated plastic flow Al-Mg alloy: using DIC-technique
The aim of the present paper is the investigation of temporal instabilities and spatial localization due to the Lüders behavior, the Portevin–Le Chatelier effect and the shoulder or necking effect during uniaxial t...
Numerical modelling of reinforced concrete beams with fracture-plastic material
This paper describes the use of models of fracture-plastic materials for reinforced concrete in numerical modelling of beams made from reinforced concrete. The purpose of the paper is to use of a model of concret...