A New Method of Arresting Fatigue Crack Growth by Artificial Wedge

Kitagawa, Hideo; Toyohira, S.; Ikeda, Kenichi

doi:10.1007/978-94-009-9574-1_22

Cited by 15 publications

(10 citation statements)

References 3 publications

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“…Under cyclic loading the crack tip is shielded by a wedge of plastically deformed or ruptured (softer) material in the crack wake, as first recognized by Christensen (1963) and observed by Elber (1970), so that the effective stress intensity range at the crack tip is reduced and the growth rate retarded. Furthermore, retardation can be achieved by inserting an artificial wedge, see Kitagawa et al (1979), or other crack closure procedures. Interestingly enough such wedge type models were first considered by Barenblatt (1962) in his classic paper rationalizing the intensity factor ideas for stationary cracks.…”

Section: Discussionmentioning

confidence: 99%

Crack repair using an elastic filler

Fowkes

Freitas

Stacey

2008

Journal of the Mechanics and Physics of Solids

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Section: Discussionmentioning

confidence: 99%

Crack repair using an elastic filler

Fowkes

Freitas

Stacey

2008

Journal of the Mechanics and Physics of Solids

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“…A number of preliminary works indicated that foreign materials may be introduced into the crack flanks to achieve a similar purpose. Kitagawa et al [16 ] showed that the ingress of strain gauge adhesive was able to arrest the growth of a crack at low stress intensity level. Vecchio et al [17 ] introduced a needle tip into the wake of the crack tip and reduced the growth rate slightly.…”

Section: Fatigue Crack Growth Retardation By Infiltrationmentioning

confidence: 99%

Artificial Retardation of Fatigue Crack Growth by the Infiltration of Cracks by Foreign Materials

Shin

Huang

1998

Fatigue Fract Eng Mat Struct

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The effects of inducing artificial crack closure into fatigue cracks in AISI 304 stainless steel by infiltrating foreign materials have been investigated. The foreign materials used include pure epoxy resin and resin mixed with 0.3 μm and 4 μm TiO2 , 4 μm Fe, as well as 18 μm AISI 316L stainless steel. In all the cases studied, different degrees of crack growth retardation have been achieved. When the particle size was small enough or when the prop‐opening load for infiltration was large enough, crack arrest occurred. Crack retardation and arrest were mainly caused by the infiltrated material rather than the propping load. A rigid‐wedge model was found to have limited value in predicting the possible outcome of an infiltration. On the other hand, the degree of crack closure immediately on resumption of a test after infiltration could tell whether the treatment was going to be successful or not.

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“…On the one hand, since Kitagawa et al 3 first presented the idea of artificial wedges which were intentionally introduced into fatigue cracks in order to restrain their growth, much work has been carried out on artificial wedges (mainly adhesive materials, e.g. epoxy resin) and it has been experimentally shown that such artificial wedges reduce the rate of fatigue crack growth from which some practical uses have been suggested 3–7 . Song et al showed that closure materials through plating on crack faces brought about crack retardation and an elastic‐wedge model was effective to predict crack development 8 .…”

Section: Introductionmentioning

confidence: 99%

Automatic restraint and visual detection of fatigue crack growth by applying an alumina paste

Takahashi

Ushijima

Takahashi

et al. 2007

Fatigue Fract Eng Mat Struct

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A B S T R A C T A paste comprising fine alumina particles was applied on surfaces of steel plate specimens and a welded joint specimen, and the effects of the paste on restraint and visual detection of fatigue crack growth were experimentally investigated by performing fatigue tests with in situ observations by a charge coupled device (CCD) microscope and through various kinds of fractographic observations and elemental analyses using an scanning electron microscope (SEM) and an electron probe microanalyser (EPMA). As a result, the crack growth rate in the plate specimen was drastically retarded by the wedge effect of the alumina particles, and a 311% increase in failure life was produced on an average. The restraint of crack opening displacement (COD) value by the wedge materials was estimated by elastic finite element (FE) analyses, and the results were compared with the experimental data. Similar crack growth restraint effects were also observed on the welded joint specimen, producing a 117% increase in failure life. In the fatigue tests of the specimens on which the alumina paste was applied, a remarkable black colour developed in the white alumina paste along the paths of crack propagation, facilitating the visual detection of the cracks. An analysis using an X-ray diffractometer showed that the black matter in the paste consists of fine debris derived from the base metal. a = fatigue crack length (one-sided) a 1 = half-crack length (including the notch length) d m = mean particle size E = Young's modulus of steel E w = Young's modulus of wedge material in FEA N = number of cycles N f = failure life R = load ratio or stress ratio w = half-width of the specimen δ = COD (Crack Opening Displacement) at the notch root δ max = COD under maximum load δ min = COD under minimum (zero) load δ = δ max − δ min = COD range K = stress intensity factor range K eff = effective stress intensity factor range σ n = nominal stress range σ = nominal stress (in Tada's Eq.)

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A New Method of Arresting Fatigue Crack Growth by Artificial Wedge

Cited by 15 publications

References 3 publications

Crack repair using an elastic filler

Crack repair using an elastic filler

Artificial Retardation of Fatigue Crack Growth by the Infiltration of Cracks by Foreign Materials

Automatic restraint and visual detection of fatigue crack growth by applying an alumina paste

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