Effect of yield stress on fatigue crack growth

Fernando Ventura Antunes; Micael Frias Borges; Pedro Prates; Ricardo Branco; Marta Oliveira

doi:10.3221/IGF-ESIS.50.02

Effect of yield stress on fatigue crack growth

Authors

Fernando Ventura Antunes Department of Mechanical Engineering, University of Coimbra, Portugal
Micael Frias Borges
Pedro Prates
Ricardo Branco
Marta Oliveira

DOI:

https://doi.org/10.3221/IGF-ESIS.50.02

Keywords:

Fatigue Crack Growth, plastic CTOD, yield stress, crack closure

Abstract

Abstract. Fatigue crack growth (FCG) depends on loading, geometry and also material properties. Since FCG is supposedly linked to crack tip plastic deformation, material’s yield stress, Y₀, is an important parameter. The main objective here is to develop a parametric study focused on the effect of Y₀ on FCG. The study is based on the plastic CTOD, d_p, determined numerically using the finite element method. The increase of Y₀ was found to decrease d_p, and therefore FCG rate. The variation is non-linear, being more important for lower values of Y₀. The effect of Y₀ was found to be much more relevant for the 7050 aluminium alloy than for the 304L stainless steel, which indicated a major influence of isotropic saturation stress. With the inclusion of crack closure, the reduction of d_p is kept, but there is a substantial reduction of d_p and therefore of FCG rate.

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Published

11-07-2019

Issue

Vol. 13 No. 50 (2019): October 2019

Section

SI: Characterisation of Crack Tip Fields

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