Notch‐Size Effect in fatigue of steel specimens – verification of some calculation methods

Buch, Alfred

doi:10.1002/mawe.19840151004

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…After extensive comparison of experimental and numerical results, Buch (1984) concluded that the estimates of notch size effect according to one-parameter formulas are mostly quite conservative and are also in disagreement with some trends observed for notch sensitivity of steels. Recent work by Ciavarella and Meneghetti (2004) has shown that the classical Peterson's (1959) relation results in fatigue notch factor that approaches unity when the notch root radius tends to zero regardless of the actual notch or crack size, thus completely neglecting the existence of notch size effect.…”

Section: Introductionmentioning

confidence: 77%

“…The Neuber and Peterson equations are the first order attempts to incorporate materials length scale in describing notch sensitivity via the socalled material constant; typically a function of the tensile strength of the material. While a single parameter involving a critical distance may be a viable approach, notch size effects arising from deformation and damage phenomena may render an elementary simple single parameter approach like critical distance inapplicable (Buch 1984;Qylafku et al 1999;Ciavarella and Meneghetti 2004;Lanning et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Microstructure-dependent fatigue damage process zone and notch sensitivity index

et al. 2011

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The development of simulation methods for calculating notch root parameters for purposes of estimating the fatigue life of notched components is a critical aspect of designing against fatigue failures. At present, however, treatment of the notch root stress and plastic strain field gradients, coupled with intrinsic length scales of grains or other material attributes, has yet to be developed. Ultimately, this approach will be necessary to form a predictive basis for notch size effects in forming and propagating microstructurally small cracks in real structural materials and components. In this study, computational micromechanics is used to clarify and distinguish process zone for crack formation and microstructurally small crack growth, relative to scale of notch root radius and spatial extent of stress concentration at the notch. A new nonlocal criterion for the fatigue damage process zone based on the distribution of a shear-based fatigue indicator parameter is proposed and used along with a statistical method to obtain a new microstructure-sensitive fatigue notch factor and associated notch sensitivity index, thereby extending notch sensitivity to explicitly incorporate microstructure sensitivity and attendant size effects via probabilistic arguments. The notch sensitivity values obtained for a range of notch root radii using the new statistical approach presented in this

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Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Microstructure-dependent fatigue damage process zone and notch sensitivity index

et al. 2011

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“…Notch influences are generally specified by the fatigue notch factor K f representing the ratio of the unnotched to the notched fatigue resistance. A study in [2] provides an overview and verification of several models evaluating K f for different base materials. Engineering feasible concepts are mostly based on the relative stress gradient ' due to an efficient automated evaluation of finite element results.…”

Section: T Imentioning

confidence: 99%

Multiaxial fatigue assessment of crankshafts by local stress and critical plane approach

Leitner¹,

Grün²,

Tuncali³

et al. 2016

Frattura Ed Integrità Strutturale

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ABSTRACT. For multiaxially-loaded parts several stress-based fatigue assessment concepts are applicable mostly taking uniaxial test results as basis. These approaches work well in case of proportional loading states, but on contrary, for non-proportional stress conditions, implying a change of the principal stress direction, deviations in the fatigue life estimation may occur. The aim of this study is to evaluate the cyclic multiaxial material behavior experimentally and to proof the applicability of stress-based methods to assess the fatigue strength. The investigated base materials incorporate the commonly applied crankshaft steels 50CrMo4 and 34CrNiMo6 without surface-layer post-treatments. Extensive fatigue tests with small-scale specimens are performed to evaluate the material behavior under cyclic loading. The experiments include basic uniaxial characterizations, such as notch stress sensitivity and effect of loading type, including tests under tension, rotating bending, and torsion loading. Additionally, combined loading tests with proportional and non-proportional situations are presented to reveal the fatigue resistance for multiaxial stress states. Significant loading conditions, such as proportional stress under rotating bending and torsion, and further on, non-proportional effects like phase shifts and varying frequency ratios are presented. The local fatigue strength assessment is performed on the basis of the critical plane approach, whereat the normal and shear stresses are transformed in numerous cutting planes. Equivalent stress hypotheses are applied and compared with the Citation: Leitner, M., Grün, F., Tuncali, Z., Steiner, R., Chen, W., Multiaxial fatigue assessment of crankshafts by local stress and critical plane approach, Frattura ed Integrità Strutturale, 38 (2016) M. Leitner et alii, Frattura ed Integrità Strutturale, 38 (2016) [47][48][49][50][51][52][53] 48 experiments showing that the Huber-Mises-Hencky criterion fits well to the test results in case of proportional rotating bending and torsion loading.

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“…Neuber's hypothesis and variants of his hypothesis proposed by other investigators form the basis for flaw tolerance analysis. See, for example [8], a reference that makes comparisons among the Neuber-Kuhn, Peterson, Heywood, Stieler-Siebel and the Buch-Switek formulas, all proposed for the prediction of the effects of fillets, characterized by a radius, and notches, characterized by a depth, a notch angle and radius, on the fatigue limit.…”

Section: Definitionmentioning

confidence: 99%

Mathematical models for flaw and damage tolerance analyses

Szabó¹

2015

JCAM

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Notch‐Size Effect in fatigue of steel specimens – verification of some calculation methods

Cited by 5 publications

References 4 publications

Microstructure-dependent fatigue damage process zone and notch sensitivity index

Microstructure-dependent fatigue damage process zone and notch sensitivity index

Multiaxial fatigue assessment of crankshafts by local stress and critical plane approach

Mathematical models for flaw and damage tolerance analyses

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