An experimental and numerical study of crack closure

Blom, A.F.; Holm, D.

doi:10.1016/0013-7944(85)90039-6

Cited by 114 publications

(46 citation statements)

References 28 publications

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“…where did the extra material to cause closure come fi'om in the crack-tip region, since the material could not deform in the thickness direction, like that under plane-stress conditions. Blom and Holm [72] and Fleck and Newman [76,79] studied crack-growth and closure under plane-strain conditions and found that cracks did close but the crack-opening levels were much lower than those under plane-stress conditions. Sehitoglu and his coworkers [74,85] found later that the residual plastic deformations that cause closure came fi'om the flanks of the crack (i.e., the material was plastically stretched in the direction parallel to the crack surfaces).…”

Section: Plastic Zonementioning

confidence: 99%

The merging of fatigue and fracture mechanics concepts: a historical perspective

Newman

1998

Progress in Aerospace Sciences

145

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Section: Plastic Zonementioning

confidence: 99%

The merging of fatigue and fracture mechanics concepts: a historical perspective

Newman

1998

Progress in Aerospace Sciences

145

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“…A large number of researchers have made attempts to understand the in¯uences of mean stress [2,3] and specimen thickness [4,5] on the fatigue crack growth rate based on the crack closure argument. These in¯uences, however, were not always attributed to the crack closure phenomenon [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of stress ratio and specimen thickness on fatigue crack growth of CK45 steel

Costa

Ferreira

1998

Theoretical and Applied Fracture Mechanics

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Presented are the eect of stress ratio and thickness on the fatigue crack growth rate of CK45 steel according to DIN 17200. Test results are obtained for constant amplitude load in tension with three stress ratios of R 0, 0.2 and 0.4 and three specimen thicknesses of B 6, 12 and 24 mm. Microgauge crack opening values were used to calculate DK eff values from which the da/dN A DK eff curves are obtained. Crack closure can be applied to explain the in¯uence of mean stress and specimen thickness on the fatigue crack growth rate in the second regime of the two-parameter crack growth rate relation. An empirical model is chosen for calculating the normalized load ratio parameter U as a function of R, B and DK and, for correlating the test data. Ó

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“…At about the same time, Newman published the results of his independent investigations (14,30). Work was continued in this area by several authors (20,(31)(32)(33). The majority of the numerical work carried out though has been related to constant amplitude loading, although some cases of low-high, high-low and single overloads have been carried out (27,34).…”

Section: Introductionmentioning

confidence: 99%

Determination of crack growth for 6082-T6 aluminium subjected to periodic single and block overloads and underloads using a two dimensional finite element model

Espinosa

Fellows

Durodola

et al. 2017

International Journal of Fatigue

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ABSTRACT:The estimation of crack growth under variable amplitude loading is complex due to interaction effects such as plasticity, crack tip blunting, residual stresses, crack tip closure and crack tip branching. Crack closure has been identified to be one of the main interaction effects. In order to study the effect of crack closure the authors have previously carried out experimental testing to obtain more accurate measurements of crack opening and closure (1, 2). They have also developed two dimensional plane stress Finite Element models utilising high mesh density whilst maintaining the ability to measure crack growth over long crack lengths (3). This initial work has been extended in this paper to examine the effects of single and block overloads and random spectrum loading on crack growth. The crack length distance that is affected by overloads and underloads measured experimentally and predicted numerically are shown to be very close when using cyclic hardening material properties and kinematic hardening. In addition the comparison of experimental and numerical crack growth versus crack length graphs shows good correlation of the crack growth acceleration and retardation after the applied overload which has not been seen previously. These comparisons seem to be a very useful tool to validate numerical models.

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An experimental and numerical study of crack closure

Cited by 114 publications

References 28 publications

The merging of fatigue and fracture mechanics concepts: a historical perspective

The merging of fatigue and fracture mechanics concepts: a historical perspective

Effect of stress ratio and specimen thickness on fatigue crack growth of CK45 steel

Determination of crack growth for 6082-T6 aluminium subjected to periodic single and block overloads and underloads using a two dimensional finite element model

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