Title

EVALUATION OF FATIGUE CRACK GROWTH RETARDATION AND ARREST IN BIFURCATED CRACKS

EVALUATION OF FATIGUE CRACK GROWTH RETARDATION AND ARREST IN BIFURCATED CRACKS

Authorship

MIRANDA, ANTONIO CARLOS DE OLIVEIRA; MEGGIOLARO, MARCO ANTONIO; CASTRO, JAIME TUPIASSÚ PINHO DE; MARTHA, LUIZ FERNANDO

MIRANDA, ANTONIO CARLOS DE OLIVEIRA

I am this author

MEGGIOLARO, MARCO ANTONIO

I am this author

CASTRO, JAIME TUPIASSÚ PINHO DE

I am this author

MARTHA, LUIZ FERNANDO

I am this author

DOI

10.5151/2594-5327-2552

Downloads

Abstract

Fatigue crack kinking and bifurcation are well-known phenomena capable of inducing significant growth retardation or even crack arrest. However, symmetrically bifurcated crack models available in the literature cannot account for the propagation behavior observed in practice. In this work, specialized Finite Element (FE) and life assessment software are used to predict the reduction in the propagation rates in asymmetrically bifurcated cracks. The crack path and the associated stress intensity factors (SIF) of asymmetrically bifurcated cracks are numerically obtained for several bifurcation angles. A companion life assessment program is used to estimate the number of delay cycles associated with crack bifurcation, allowing for a better understanding of the influence of crack deflection in the propagation life of structural components.

Fatigue crack kinking and bifurcation are well-known phenomena capable of inducing significant growth retardation or even crack arrest. However, symmetrically bifurcated crack models available in the literature cannot account for the propagation behavior observed in practice. In this work, specialized Finite Element (FE) and life assessment software are used to predict the reduction in the propagation rates in asymmetrically bifurcated cracks. The crack path and the associated stress intensity factors (SIF) of asymmetrically bifurcated cracks are numerically obtained for several bifurcation angles. A companion life assessment program is used to estimate the number of delay cycles associated with crack bifurcation, allowing for a better understanding of the influence of crack deflection in the propagation life of structural components.

Keywords

fatigue, crack bifurcation, growth retardation

fatigue, crack bifurcation, growth retardation