Estimation of plasticity-induced crack closure in a pre-existing plastic zone

Hou, Chien-Yuan; Charng, Jenq Jy

doi:10.1016/0142-1123(96)00107-7

Cited by 18 publications

(8 citation statements)

References 13 publications

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“…The general pattern is that an increased overload or overloading time results in a longer crack growth region for which deceleration of crack growth occurs. This can be rationalized on the basis of the suggestion 2 –10 that the retardation is a result of strain hardening and residual compressive stress induced by plastic deformation (as a result of a single tensile overload) ahead of the crack tip. The conclusion that strain hardening is the main cause of retardation was challenged by other researchers 15 –17 .…”

Section: Resultsmentioning

confidence: 99%

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Effects of a single tensile overload on fatigue crack growth in a 316L steel

Wheatley

Estrin

1999

Fatigue Fract Eng Mat Struct

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The aim of this study was to investigate the effects of a single tensile overload on subsequent fatigue crack growth in a 316L stainless steel. Fatigue tests were conducted under the plane stress condition, and further supplemented with compliance measurements and field emission scanning electron microscopy (FESEM) observations. Effects of a tensile overload, e.g. initial acceleration and subsequent retardation of fatigue crack growth, were explained and quantified by FESEM and compliance measurements. The FESEM observations suggest that the initial crack growth acceleration stems from void and quasi‐cleavage fracture within the fatigue damage zone in the vicinity of the crack tip. Systematic compliance measurements taken during fatigue crack growth suggest that the overall crack growth retardation is related to strain hardening and residual compressive stress produced by the plastic deformation associated with the tensile overload.

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Section: Resultsmentioning

confidence: 99%

“…Crack growth retardation as a result of a single tensile overload is well documented in the literature 1 –10 . Transient crack growth acceleration before the retardation has also been reported in some cases 1 ,.…”

Section: Introductionmentioning

confidence: 89%

Effects of a single tensile overload on fatigue crack growth in a 316L steel

Wheatley

Estrin

1999

Fatigue Fract Eng Mat Struct

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“…The retardation persists until the crack has propagated through the perturbed plastic zone. Therefore, the retardation period depends on both the fatigue-induced and overload-induced plastic zones [1,2].…”

Section: Introductionmentioning

confidence: 99%

Changes in lattice-strain profiles around a fatigue crack through the retardation period after overloading

Sun

Tang

et al. 2006

Physica B: Condensed Matter

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“…As a crack propagates through this region, the amount of plastically deformed material left along the crack faces is expected to differ from that for a crack growing in virgin material. Previous research has been carried out on the closure behaviour of fatigue cracks growing through material with residual stress 8–11 . However, the amount of numerical and analytical modelling devoted to cold expanded holes is limited.…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical modelling of plasticity‐induced crack closure in cold‐expanded holes

Matos

Nowell

2008

Fatigue Fract Eng Mat Struct

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A B S T R A C T The aim of this research was the development of an analytical model for plasticity-induced fatigue crack closure for cold expanded holes. This paper extends Nowell's plane stress model of plasticity-induced crack closure for a plate with a circular hole and two radial symmetric cracks. The possibility of existence of an initial residual stress field is also taken into account. This model has potential to be applied to other cracked geometries and arbitrary residual stress fields, although the paper is focused on the study of coldexpanded holes. Hole cold-expansion is widely used in aircraft industry, for improving the fatigue performance of rivet holes by delaying fatigue crack propagation. This paper shows that the residual stress field due to cold-expansion has a strong influence on the closure behaviour and therefore on fatigue crack propagation. The analytical model developed, was compared with finite element analyses of plasticity-induced crack closure with and without residual stresses. Finally, the model was used to predict fatigue lives for some experiments recently reported in the literature for fatigue crack propagation from coldexpanded holes. Predicted fatigue lives correlate well with experimental data. 2a = crack length A = Paris law constant b 0y , b 0yj = thickness of the stretched material and as modelled by ith dislocation dipole b y = crack opening or yield zone displacement b yj = strength of the jth dislocation dipole (Burgers vector) c i = x co-ordinate of the centre of the ith dislocation dipole C = stress intensity factor geometry factor 2d = total length of crack and yield zones D i = starting hole diameter D m = major diameter of the mandrel e i = length of the ith dislocation dipole E = Young's modulus F 1 , F 2 , F 3 = objective functions G(λ, γ ) = stress intensity factor kernel function i = hole expansion interference level K(x j , c i , e i ) = kernel function (stress due to dislocation dipole of unit strength) K = stress intensity factor K max , K min = maximum and minimum values of (nominal) stress intensity factor 488

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Estimation of plasticity-induced crack closure in a pre-existing plastic zone

Cited by 18 publications

References 13 publications

Effects of a single tensile overload on fatigue crack growth in a 316L steel

Effects of a single tensile overload on fatigue crack growth in a 316L steel

Changes in lattice-strain profiles around a fatigue crack through the retardation period after overloading

Analytical and numerical modelling of plasticity‐induced crack closure in cold‐expanded holes

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