Crack Closure Behavior of Surface Cracks Under Pure Bending

Foroughi, Reza; Radon, J.C.

doi:10.1520/stp27214s

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…Fatigue crack growth rates of surface cracks as a function of AK and AKeR for various stress ratios. 5 very closely to strain gauges, stable curves of load versus differential strain were obtained. The crack opening level measured by the strain gauges was found to vary with the distance from the crack tip.…”

Section: Measurements Of Closure Responses Of Surface Cracksmentioning

confidence: 76%

“…On the other hand, the plane stress closure at the surface intersection point, i.e. plane stress closure, has been frequently measured by using an Elber-type gauge [5] or other gauges [3,4] located just behind the crack tip, for example, at a distance of 0.5-1 mm behind the crack tip. In these methods, in order to continuously monitor the plane stress closure behaviour with crack growth, the gauge should be periodically removed to just behind the growing crack tip, thereby interrupting fatigue testing.…”

Section: Measurements Of Closure Responses Of Surface Cracksmentioning

confidence: 99%

“…Fleck et a1. [3] reported that the closure response of a surface crack is similar to that of a through-thickness crack in a thick specimen for growth rates in the range -10-4mm/cycle, while Foroughi and Radon [5] showed that closure for a surface crack is smaller than that of a through-thickness crack. On the other hand, Jolles and Tortoriello [ 101 have used the crack closure results of through-thickness cracks to predict fatigue growth of surface cracks.…”

Section: Introductionmentioning

confidence: 98%

“…Recently, relatively detailed closure behaviour of surface cracks has been reported by Clerivet and Bathias [4] for a 2124-T351 aluminium alloy and Foroughi and Radon [5] for a BS 4360-50B steel. In particular, three-dimensional aspects of closure behaviour of surface cracks have been investigated extensively through optical interferometry measurements by Troha et af.…”

Section: Introductionmentioning

confidence: 99%

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Crack Growth and Closure Behaviour of Surface Cracks Under Axial Loading

Kim

Song

1992

Fatigue Fract Eng Mat Struct

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Crack growth and closure behaviour of surface cracks in 7075-T6 aluminium alloy are investigated under axial loading, noting the difference in fatigue growth behaviour at the maximum crack depth point and at the surface intersection point and also with through-thickness crack growth behaviour. The plane strain closure response at the point of maximum depth of a surface crack is monitored using an extensometer spanning the surface crack at the midpoint of its length. The plane stress closure at the surface intersection point is observed by multiple strain gauges placed at appropriate intervals ahead of the crack tip and continuously monitored without interrupting the fatigue test. The crack opening ratio is found to be about 10% greater at the maximum depth point than at the surface intersection point. Under axial loading, the difference in plane strain crack closure behaviour between the surface crack and the through-thickness crack is relatively small. Growth rates of surface cracks can be well described by the effective stress intensity factor range based on the closure measurements made in this study. The growth rates in terms of the effective stress intensity factor range seem to be slightly slower in surface cracks than in through-thickness cracks.

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Section: Measurements Of Closure Responses Of Surface Cracksmentioning

confidence: 76%

Section: Measurements Of Closure Responses Of Surface Cracksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Crack Growth and Closure Behaviour of Surface Cracks Under Axial Loading

Kim

Song

1992

Fatigue Fract Eng Mat Struct

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“…In metallic materials, a growing surface flaw will remain closed or partially closed along the crack front for a portion of the applied cyclic load as a consequence of plastically deformed material left in the wake of the growing crack. Proper characterization of this plasticity‐induced crack closure is needed when predicting flaw shape development and growth [1–7 ].…”

Section: Introductionmentioning

confidence: 99%

A Modified Strip‐yield Model for Prediction of Plasticity‐induced Closure in Surface Flaws

Daniewicz

1998

Fatigue Fract Eng Mat Struct

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A slice synthesis methodology is developed and used to construct a modified strip‐yield model for the semielliptical surface flaw, enabling prediction of plasticity‐induced closure along the crack front and subsequent fatigue crack growth. A mathematical description of the model is presented. Slice synthesis methodologies have previously been limited to stress intensity factor and elastic crack displacement computation. Predictions of flaw shape evolution under cyclic loading are compared with experimental data for aluminium alloy specimens under uniform constant amplitude loading with R = 0.1, 0.3 and 0.6. Model predictions are shown to correlate well with experimental data. An empirical correlation of relative crack opening stress with applied R ratio from the literature is shown to underestimate the level of closure at the deepest point of penetration when compared with the model predictions.

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