The assessment of fatigue life of notched components at uniaxial pulsating loading using the fracture mechanics approach

Ostash, О. P.; Chepil, R. V.; Vira, V. V.

doi:10.1016/j.ijfatigue.2017.09.007

Cited by 8 publications

(7 citation statements)

References 24 publications

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“…As shown in Figure C, the predicted results (red line) are above the experimental results (black line), indicating that the prediction life is slightly higher than the experimental results. The error bands are less than the 10%, which is good for life prediction of HCF . Therefore, this method can be applicable to the life prediction of large moving components.…”

Section: Discussionmentioning

confidence: 81%

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A prediction method for fatigue life of large moving components as function of scale factor: A case of motor‐generator rotor

Pan

Pang

Zhang

et al. 2017

Fatigue Fract Eng Mat Struct

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With the development of science and technology, more and more large moving components have been used in industry, and their service lives have become an important issue. After analysis of the previous results, considering the scale factor, a prediction method for fatigue life of large moving components based on the Basquin relation was proposed at first, and then the magnet pole part of motor‐generator rotor was chosen to make simulation parts with different scale factors mainly in terms of their S‐N curves and fractographies. It was found that with the change of specimen scale factor, the stress concentration factor at transition arc is almost unchanged as well as the fatigue strength exponent, and the fatigue strength coefficient changes linearly. Based on those results, a life prediction method was validated, and the results show that this method is a simple but more precise relation. After fatigue fracture surface and crack growth angle observations and quantitative analyses, the fatigue damage mechanisms associated with the relation among fatigue strength exponent and coefficient and scale factors were explained well. Those studies will provide a new clue to the prediction of the service life for those large moving components.

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Section: Discussionmentioning

confidence: 81%

“…The error bands are less than the 10%, which is good for life prediction of HCF. 35 Therefore, this method can be applicable to the life prediction of large moving components.…”

Section: Fatigue Life Prediction Methodsmentioning

confidence: 99%

A prediction method for fatigue life of large moving components as function of scale factor: A case of motor‐generator rotor

Pan

Pang

Zhang

et al. 2017

Fatigue Fract Eng Mat Struct

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“…Kuz et al (2015Kuz et al ( , 2019 investigated the influence of stress concentrators (square hole, cut or rigid inclusion) on the strength of a plate under uniaxial tension using the numerical solution of boundary-value problems of the theory of small elasto-plastic deformations for a linear hardening material. The growth of microstructurally short and physically small cracks in the fatigue process zone and the initiation of macrocrack in notched tension specimens were investigated in the work of Ostash (2017).…”

Section: Introductionmentioning

confidence: 99%

Pure Bending of Strip (BEAM) with Crack in Strip of Tensile Stress with Allowance for Plastic Strips Near Crack Tips

Sulym

Opanasovych

Слободян

et al. 2020

Acta Mechanica Et Automatica

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In the article, the pure bending problem for strip (beam) with straight, perpendicular to its axis crack located in the zone of tensile stresses is investigated on the assumption of narrow plastic strips near crack tips. Using methods of the theory of functions of a complex variable and complex potentials, the problem is reduced to the several linear conjunction problems. The solutions of latter problems are obtained in the class of functions confined in the edges of plastic strips. Formulas for the calculation of their lengths are derived. Expressions for the determination of crack tip opening values are written. Numerical analysis of the problem is performed.

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“…Regarding the latter parameter, it should be noted that the wheels operate under cyclic loading conditions. In existing norm documents, unfortunately, there are no characteristics of cyclic crack growth resistance, which (in our opinion) are considered in modern fatigue fracture mechanics as the most adequate basis for diagnosing fatigue service life and residual life of structural elements in the specified conditions of their operation [4]. In this case, the fatigue crack growth rate diagram which represents the relationship between the fatigue crack growth rate and a certain parameter characterizing conditions of its growth, is the main source for determining parameters of the material resistance against fatigue crack propagation under cyclic load.…”

Section: Introductionmentioning

confidence: 99%

The diagnostics and ways heat treatment optimization of a railway wheels steel

Vira¹,

Kulyk²,

Chepil³

et al. 2019

Diagnostyka

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A high resolution sensor of linear displacements has been elaborated for diagnosing the size of the crack tip opening in standard test specimens. Based on the data measured during fatigue crack growth resistance tests of a wheel steel heat treated after various modes, calculations of the strain and energy parameters of local fracture were performed for the corresponding variants of treatment, and fatigue crack growth rate diagrams were constructed using different approaches of fatigue fracture mechanics. It was established that the diagrams obtained using the strain and energy approaches are more sensitive to material microstructure and its mechanical properties than the traditional diagrams obtained using the stress approach. Based on the parameters of the fatigue crack growth resistance estimated using the strain and energy approaches, the effective diagnostics and the best heat treatment mode for the wheel steel was developed. It comprises the stages of isothermal quenching and tempering at a temperature of 500 °С, providing the highest fatigue fracture toughness of the steel.

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The assessment of fatigue life of notched components at uniaxial pulsating loading using the fracture mechanics approach

Cited by 8 publications

References 24 publications

A prediction method for fatigue life of large moving components as function of scale factor: A case of motor‐generator rotor

A prediction method for fatigue life of large moving components as function of scale factor: A case of motor‐generator rotor

Pure Bending of Strip (BEAM) with Crack in Strip of Tensile Stress with Allowance for Plastic Strips Near Crack Tips

The diagnostics and ways heat treatment optimization of a railway wheels steel

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