Criterion selection for evaluating the strength properties of functionally graded structures

Authors

  • Николай Олегович Кузин Lviv Branch of the Dnipropetrovsk National University of Railway Transport named after Acad. V. Lazarian, Blazhkevich I. 12 a, Lviv, 79052, Ukraine https://orcid.org/0000-0002-6032-4598
  • Борис Артемович Ляшенко G. S. Pisarenko Institute for Problems of Strength, Timiryazevskaya 2, Kyiv, 01014, Ukraine https://orcid.org/0000-0002-3406-7890
  • Виктор Петрович Ламашевский G. S. Pisarenko Institute for Problems of Strength, Timiryazevskaya 2, Kyiv, 01014, Ukraine https://orcid.org/0000-0002-7665-0160

DOI:

https://doi.org/10.15587/2312-8372.2015.52985

Keywords:

functionally graded materials, non-local strength criteria, thermocyclic ion nitriding

Abstract

The present state of the problem of calculating the strength parameters of functionally graded materials with the influence of non-local properties on the performance of the constructions under concentrated loads. Based on the analysis of modeling and engineering ways to describe the limit state of the material using the classic Pisarenko-Lebedev local strength criterion it is offered relationship of generalized integral-gradient criterion, which in particular cases is reduced to the classical criteria of the existing strength.

These relationships allow us to consider not only the stress-strain state at a particular point in assessing the strength of structures, but also consider the distribution of both stresses and their gradients in the vicinity of the local area that can significantly improve the accuracy of the strength assessment of the structure by taking into account fluctuations in the structure and distribution of spatial heterogeneity of property distribution.

Using the proposed criteria it is established increase (up to 4 times) the contact strength of the surface layers of steel 40X13 after ion plasma thermocyclic nitriding in the cycle ±100 °C as compared with the material without process modifications.

The use of the proposed criterion relations for parts with a pronounced gradient of properties that are under concentrated loads (in particular, in a frictional engagement) can more accurately assess their strength parameters, which is quite difficult to carry out using only classical (local) strength criteria.

Author Biographies

Николай Олегович Кузин, Lviv Branch of the Dnipropetrovsk National University of Railway Transport named after Acad. V. Lazarian, Blazhkevich I. 12 a, Lviv, 79052

Candidate of Technical Sciences, Associate Professor

Department of rolling stock and track

Борис Артемович Ляшенко, G. S. Pisarenko Institute for Problems of Strength, Timiryazevskaya 2, Kyiv, 01014

Doctor of Technical Sciences, Professor, Head of the Department

Department of Hardening the Surface of Structural Elements

Виктор Петрович Ламашевский, G. S. Pisarenko Institute for Problems of Strength, Timiryazevskaya 2, Kyiv, 01014

Candidate of Technical Sciences, Senior Researcher, Deputy Head of the Department

Department of Mechanics of structural materials

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Published

2015-11-26

How to Cite

Кузин, Н. О., Ляшенко, Б. А., & Ламашевский, В. П. (2015). Criterion selection for evaluating the strength properties of functionally graded structures. Technology Audit and Production Reserves, 6(1(26), 4–8. https://doi.org/10.15587/2312-8372.2015.52985

Issue

Vol. 6 No. 1(26) (2015): Mechanical engineering and machine building. Energy, energy-saving technologies and equipment

Section

Mechanical engineering and machine building

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Copyright (c) 2016 Николай Олегович Кузин, Борис Артемович Ляшенко, Виктор Петрович Ламашевский

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