Surface hardening influence on the fatigue limit for cylindrical parts of different diameter

Pavlov, V. F.; Кирпичeв, Виктор Алексеевич; Vakulyuk, V. S.; Сазанов, В. П.

doi:10.3103/s1068799814030180

Cited by 7 publications

(2 citation statements)

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“…In order to ensure conservative fatigue design of heterogeneous material, size effects have to be assessed properly, since they significantly influence the fatigue strength of engineering components. A study in [1] separates the size effects into statistical [2,3,4], geometrical [1,5,6], technological [7,8] and surface technology [9] contributions. The statistical size effect, whose improved assessment is the aim of this work, leads to a decrease of fatigue strength with elevated size of the structure or specimen due to increased probabilities of critical defect sizes.…”

Section: Introductionmentioning

confidence: 99%

On the Statistical Size Effect of Cast Aluminium

et al. 2019

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Manufacturing process based imperfections can reduce the theoretical fatigue strength since they can be considered as pre-existent microcracks. The statistical distribution of fatigue fracture initiating defect sizes also varies with the highly-stressed volume, since the probability of a larger highly-stressed volume to inherit a potentially critical defect is elevated. This fact is widely known by the scientific community as the statistical size effect. The assessment of this effect within this paper is based on the statistical distribution of defect sizes in a reference volume V 0 compared to an arbitrary enlarged volume V α . By implementation of the crack resistance curve in the Kitagawa–Takahashi diagram, a fatigue assessment model, based on the volume-dependent probability of occurrence of inhomogeneities, is set up, leading to a multidimensional fatigue assessment map. It is shown that state-of-the-art methodologies for the evaluation of the statistical size effect can lead to noticeable over-sizing in fatigue design of approximately 10 % . On the other hand, the presented approach, which links the statistically based distribution of defect sizes in an arbitrary highly-stressed volume to a crack-resistant dependent Kitagawa–Takahashi diagram leads to a more accurate fatigue design with a maximal conservative deviation of 5 % to the experimental validation data. Therefore, the introduced fatigue assessment map improves fatigue design considering the statistical size effect of lightweight aluminium cast alloys.

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Section: Introductionmentioning

confidence: 99%

On the Statistical Size Effect of Cast Aluminium

et al. 2019

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“…s y = 0,36, установленного в работах[6,7] для образцов и деталей из других материалов с аналогичной концентрацией напряжений. Корсетные образцы круглого поперечного сечения с наименьшим диаметром 7,5 мм (рис.…”

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Dependence of the endurance limit on the character of residual stresses distribution in the surface layer of hardened parts

Кирпичёв

Вакулюк

Букатый

et al. 2014

VESTNIK of Samara University. Aerospace and Mechanical Engineer

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The influence of the character of compressive residual stress distribution on the endurance limit of surfacehardened specimens made of various steels and alloys under bending has been examined. Specimens madeof ВНС40 and 38Х2МЮА steels with V-shaped notches were hardened by nitriding, foundation specimensmade of ВКС-5 alloy by cementation and ionic cementation, flat specimens made of ЭИ698ВД alloy by airshot-blasting. The influence of surface hardening on the endurance limit was assessed using two criterions,namely: residual stresses on the dangerous section surface and the average integral residual stresses. It was establishedthat the endurance limit of surface-hardened specimens (parts) is determined not by the value of compressiveresidual stresses on the surface but by the completeness of the diagram of the residual stress over the partsurface layer thickness on condition that the surface layer thickness is equal to the critical depth of the nonpropagatingfatigue crack. The average integral residual stress criterion calculated over the thickness of a surfacelayer of the dangerous section equal to the critical depth of the non-propagating fatigue crack gives a rather accurateestimation of the influence the character of compressive residual stress distribution has on the endurancelimit of hardened specimens (parts). In practice the estimation of the increment of surface- hardened specimens(parts) endurance limit by the criterion of residual stresses on the dangerous section surface may lead to a significanterror.

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Recent advances on size effect in metal fatigue under defects: a review

Zhu

Liao

et al. 2021

Int J Fract

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Surface hardening influence on the fatigue limit for cylindrical parts of different diameter

Cited by 7 publications

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On the Statistical Size Effect of Cast Aluminium

On the Statistical Size Effect of Cast Aluminium

Dependence of the endurance limit on the character of residual stresses distribution in the surface layer of hardened parts

Recent advances on size effect in metal fatigue under defects: a review

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