Specimen for the Determination of Fatigue Thresholds Under Cyclic Transverse Shear

Datsyshyn, O. P.; Lenkovs’kyi, T. M.; Glazov, A.Yu.

doi:10.1007/s11003-020-00330-3

Cited by 2 publications

(4 citation statements)

References 11 publications

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“…The application of the mathematical model (7) (10) for determination of residual lifetime for cracks of arbitrary contours involves mathematical diculties [2]. In order to simplify the solution process, let us generalize the equivalent area method for the case of short fatigue cracks.…”

Section: Generalization Of the Equivalent Area Methods For Small Cracksmentioning

confidence: 99%

“…The critical value of the circular crack radius r * can be found using the critical crack opening displacement criterion (10):…”

Section: Generalization Of the Equivalent Area Methods For Small Cracksmentioning

confidence: 99%

“…A comparison of the openings of the fracture process zone obtained by the proposed formula (18) and ( 17), conducted for a specimen from steel 65Ã (analogue to 1066) with the following properties: E = 2 • 10 5 ÌPà, σ t = 910 ÌPà [10], shows that the proposed formula models quite well the exact relation between the opening of the fracture process zone and the crack size for dierent load values for the generalized Sack's problem. To solve the generalised Sack's problem and determine the critical loading under uniaxial loading of a three-dimensional body, the following relation can be used [4, p. 202]:…”

Section: Evaluation Of the Opening Of The Fracture Process Zone Inmentioning

confidence: 99%

“…is sought numerically by the Runge-Kutta method. The calculation is performed for steel 65Ã (analogue to 1066) with the following properties [10]: Â iíaeåíåðíié ïðàêòèöi øèðîêî åêñïëóàòóþòüñÿ åëåìåíòè êîíñòðóêöié ç ìàëèìè òðiùèíàìè, ïðîòå âiäíîñíî ïðîñòi ìåòîäè îöiíêè äîâãîâi÷íîñòi òàêèõ êîíñòðóêòèâíèõ åëåìåíòiâ ðîçðîáëåíî íåäîñòàòíüî. Çàïðîïîíîâàíî óçàãàëüíåííÿ ìåòîäó åêâiâàëåíòíèõ ïëîù íà âèïàäîê ìàëèõ âòîìíèõ òðiùèí iç âèêîðèñòàííÿì àëüòåðíàòèâíîãî ïðåäñòàâëåííÿ çàëåaeíîñòi øâèäêîñòi òðiùèíè âiä ðîçêðèòòÿ çîíè ïåðåäðóéíóâàííÿ áiëÿ êîíòóðó òðiùèíè.…”

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confidence: 99%

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Generalization of the equivalent area method for the case of short fatigue cracks in a three-dimensional body

Yadzhak¹

2020

vmm

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Section: Generalization Of the Equivalent Area Methods For Small Cracksmentioning

confidence: 99%

“…The critical value of the circular crack radius r * can be found using the critical crack opening displacement criterion (10):…”

Section: Generalization Of the Equivalent Area Methods For Small Cracksmentioning

confidence: 99%

Section: Evaluation Of the Opening Of The Fracture Process Zone Inmentioning

confidence: 99%

mentioning

confidence: 99%

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Generalization of the equivalent area method for the case of short fatigue cracks in a three-dimensional body

Yadzhak¹

2020

vmm

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The Role of Stress–Strain State of Gas Turbine Engine Metal Parts in Predicting Their Safe Life

Duriagina¹,

Kulyk²,

Filimonov³

et al. 2021

Usp. Fiz. Met.

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The influence of various factors on the workability of critical metallic parts of a gas turbine engine (GTE) is analysed and systematized. As shown, compressor blades fail as a result of foreign-objects’ damage, gas corrosion, and erosion. Compressor blade roots in most cases fail due to fretting wear caused by vibrations, while the fir-tree rim of turbine discs fails due to low-cycle fatigue (LCF) damage and creep. An increase in the radial gaps between the rotor and stator of the turbine reduces the thrust force and causes changes in the gas-dynamic loading of the engine components. Additional oxidation of metal parts is observed under the action of hot gases from the combustion chamber. The principles of material selection for manufacturing turbine blades and disks, concepts of alloying heat-resistant alloys, and modern methods of surface engineering due to applying protective oxidation-resistant coatings, in particular, chemical vapour deposition (CDV), physical vapour deposition (PVD), air plasma spraying (APS), etc., are also described. To predict the lifetime of turbine disks, it is proposed to use the modified Walker model and Miner’s rule. To specify the time before the failure of the metal blades of the turbine, it is proposed to use the finite element method. To monitor the working-surfaces’ deformations of the gas turbine engine, it is recommended to use optical-digital methods.

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Specimen for the Determination of Fatigue Thresholds Under Cyclic Transverse Shear

Cited by 2 publications

References 11 publications

Generalization of the equivalent area method for the case of short fatigue cracks in a three-dimensional body

Generalization of the equivalent area method for the case of short fatigue cracks in a three-dimensional body

The Role of Stress–Strain State of Gas Turbine Engine Metal Parts in Predicting Their Safe Life

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