A numerical study of non-linear crack tip parameters
Journal Title: Frattura ed Integrità Strutturale - Year 2015, Vol 9, Issue 33
Abstract
Crack closure concept has been widely used to explain different issues of fatigue crack propagation. However, different authors have questioned the relevance of crack closure and have proposed alternative concepts. The main objective here is to check the effectiveness of crack closure concept by linking the contact of crack flanks with non-linear crack tip parameters. Accordingly, 3D-FE numerical models with and without contact were developed for a wide range of loading scenarios and the crack tip parameters usually linked to fatigue crack growth, namely range of cyclic plastic strain, crack tip opening displacement, size of reversed plastic zone and total plastic dissipation per cycle, were investigated. It was demonstrated that: i) LEFM concepts are applicable to the problem under study; ii) the crack closure phenomenon has a great influence on crack tip parameters decreasing their values; iii) the Keff concept is able to explain the variations of crack tip parameters produced by the contact of crack flanks; iv) the analysis of remote compliance is the best numerical parameter to quantify the crack opening level; v) without contact there is no effect of stress ratio on crack tip parameters. Therefore it is proved that the crack closure concept is valid.
Authors and Affiliations
F. Antunes, R. Branco, L. Correia, A. Ramalho
Keywords
Related Articles
- EP ID EP100608
- DOI 10.3221/IGF-ESIS.33.25
- Views 74
- Downloads 0
Extension of the CJP model to mixed mode I and mode II
The present authors have previously proposed a novel ‘plastic inclusion’ approach for dealing with the local plasticity which occurs at the tip of a growing fatigue crack. This meso-scale model provides a mod...
An effect of heat insulation parameters on thermal losses of water-cooled roofs for secondary steelmaking electric arc furnaces
The aim of this work is research in the insulation parameters effect on the thermal losses of watercooled roofs for secondary steelmaking electric arc furnaces. An analytical method has been used for the investig...
Ductile fracture modelling and J-Q fracture mechanics: a constraint based fracture assessment approach
. The reduced state of stress triaxiality observed in shallow cracked components allows an increased capacity to resist crack propagation compared to that observed in deeply cracked specimens. This may be regarded...
Contatto tra i componenti di una protesi di ginocchio: studio numerico e sperimentale
Scopo del presente lavoro è lo studio dell’area di contatto in una protesi di ginocchio utilizzando due differenti approcci. In particolare è stata studiata l’interfaccia fra la componente femorale e l’inserto in p...
Investigation of crack propagation in single optical fiber composite with thermal influence by finite element method
Two parallel comparative ‘Conventional Method and Computer Simulation using ANSYS software’ for prediction of crack growth and its behavior in optical fiber are studied and presented in this work. Corresponding finite el...