Mechanics of mixed mode small fatigue crack growth

Hoshide, Toshihiko; Socie, D. F.

doi:10.1016/0013-7944(87)90033-6

Cited by 60 publications

(32 citation statements)

References 24 publications

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“…This transition crack length may also depend on stress state and stress Figure 27. Correlation of uniaxial (left) and torsional (right) fatigue crack growth rate with a mixed mode long crack form for AJ [53] for Incone1718. The growth curves are distinct for the two cases based on AJ.…”

Section: Pmnci~al Strains P~ Oir Maxilqut4 Shi[ar Plan[ • 01recti~ ¢1mentioning

confidence: 99%

“…The applicability of critical plane approaches for shear-dominated microcracking appears to be closely linked with the Stage I propagation phase for small cracks. Hoshide and Socie [53] applied a mixed mode I-II form of the long crack A J-integral of EPFM to combined axial and torsional loading of smooth tubular specimens to correlate the fatigue crack growth rate behavior of small cracks using the power law relationship…”

Section: Pmnci~al Strains P~ Oir Maxilqut4 Shi[ar Plan[ • 01recti~ ¢1mentioning

confidence: 99%

“…The exponent m varies somewhat according to stress state. Figure 27 shows the correlation of da/dN data [53] based on (11) for Inconel 718 subjected to uniaxial and torsional fatigue. Reasonable correlation was obtained, although once again it is observed that crack lengths less than 2-3 grain diameters (< 150 #m) exhibit a higher growth rate than suggested by the power law relation based on data for longer cracks.…”

Section: Pmnci~al Strains P~ Oir Maxilqut4 Shi[ar Plan[ • 01recti~ ¢1mentioning

confidence: 99%

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Basic issues in the mechanics of high cycle metal fatigue

McDowell

1996

Int J Fract

156

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Mechanics issues related to the formation and growth of cracks ranging from subgrain dimension to up to the order of one mm are considered under high cycle fatigue (HCF) conditions for metallic materials. Further efforts to improve the accuracy of life estimation in the HCF regime must consider various factors that are not presently addressed by traditional linear elastic fracture mechanics (LEFM) approaches, nor by conventional HCF design tools such as the S-N curve, modified Goodman diagram and fatigue limit. A fundamental consideration is that a threshold level for AK for small/short cracks may be considerably lower than that for long cracks, leading to non-conservative life predictions using the traditional LEFM approach.Extension of damage tolerance concepts to lower length scales and small cracks relies critically on deeper understanding of (a) small crack behavior including interactions with microstructure, (b) heterogeneity and anisotropy of cyclic slip processes associated with the orientation distribution of grains, and (c) development of reliable small crack monitoring techniques. The basic technology is not yet sufficiently advanced in any of these areas to implement damage tolerant design for HCE The lack of consistency of existing crack initiation and fracture mechanics approaches for HCF leads to significant reservations concerning application of existing technology to damage tolerant design of aircraft gas turbine engines, for example. The intent of this paper is to focus on various aspects of the propagation of small cracks which merit further research to enhance the accuracy of HCF life prediction. Predominant concern will rest with polycrystalline metals, and most of the issues pertain to wide classes of alloys.

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Section: Pmnci~al Strains P~ Oir Maxilqut4 Shi[ar Plan[ • 01recti~ ¢1mentioning

confidence: 99%

Section: Pmnci~al Strains P~ Oir Maxilqut4 Shi[ar Plan[ • 01recti~ ¢1mentioning

confidence: 99%

Section: Pmnci~al Strains P~ Oir Maxilqut4 Shi[ar Plan[ • 01recti~ ¢1mentioning

confidence: 99%

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Basic issues in the mechanics of high cycle metal fatigue

McDowell

1996

Int J Fract

156

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“…Following a proposal from Hoshide and Socie [51] , the crack driving forces Z I , Z II and Z III are approximated based on effective ranges of the associated elastic-plastic strain energy density: Here in, Y I , Y II and Y III are geometry functions for the semielliptical surface crack at a notch, according to the theory of elasticity. DW y,eff is the part of the elastic-plastic strain energy density that is composed during an opened crack by integrating stresses normal to the crack face over the corresponding strains.…”

Section: Application To Notched Componentsmentioning

confidence: 99%

Short crack approach for multiaxial fatigue assessment

Vormwald

Hertel²

2008

Materialwissenschaft Werkst

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A significant part of the fatigue life is spent during short crack growth. Therefore, modelling of short fatigue crack growth offers an opportunity to improve the accuracy of numerical life assessment. Besides stating some general remarks on the short crack approach itself and on multiaxial fatigue criteria, a short crack growth based fatigue life prediction approach for multiaxial non-proportional loading is presented. This approach accounts for the geometrical size effect by considering the geometry correction functions for semi-elliptical surface cracks in inhomogeneous gradient stress fields. The geometrical size effect is becoming significant for notch radii smaller than four times the defined technical crack size. Additionally, life influencing factors due to the statistical size effect have been taken into account. The comparison of calculated and experimentally observed fatigue lives of shouldered shafts made of S460N with notch radii of 0.2 to 4.0 mm under non-proportional tension and torsion loading yields a satisfying accuracy.

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“…With so many plastic effects playing a role in crack growth under non-proportional loading, a crack tip parameter, which takes plasticity into account, has to be used in further research. Several studies [11][12][13][14][15] have shown that J is a very F successful parameter to model fatigue crack growth under proportional and non-proportional loadings, therefore an opportunity might arise to extend this solution to long cracks. The J-integral should be interpreted according to the definitions of Dowling and Begley [16], Wüthrich [17] and Hertel et al [18].…”

Section: Introductionmentioning

confidence: 99%

Growth of long fatigue cracks under non-proportional loadings – experiment and simulation

Hoș

Vormwald

2016

Frattura Ed Integrità Strutturale

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ABSTRACT. An experimental campaign was carried out on thin-walled tubes under tension and torsion. The results from experiments are measured and compared. It is observed that cracks follow a shear-dominated growth pattern with increasing crack length, instead of a tension-dominated one. The experiments are performed with high amplitudes applied to the specimens, resulting in large cyclic plastic deformations and crack growth rates up to 10 -3 mm/cycle. Stress intensity factors were calculated for the proportional loading case.

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Mechanics of mixed mode small fatigue crack growth

Cited by 60 publications

References 24 publications

Basic issues in the mechanics of high cycle metal fatigue

Basic issues in the mechanics of high cycle metal fatigue

Short crack approach for multiaxial fatigue assessment

Growth of long fatigue cracks under non-proportional loadings – experiment and simulation

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