STRESS CONCENTRATION IN THE VICINITY OF A CRACK IN THE ROAD COATING UNDER TRANSPORT LOADS

ABSTRACT

Shevchuk L.V. Stress concentration in the vicinity of a crack in the road coating under transport loads. Visnyk National Transport University. Series «Technical sciences». Scientific and Technical Collection. - Kyiv: National Transport University, 2020. - Issue 1 (46).

The problem of stress concentration in the vicinity of a crack under the action of transport loads is posed. Its analysis takes place in an elastic (thermoelastic) formulation using the given modules that correspond to a given state of the system at a given load level. Cases where the coating has no cracks and has them in the upper and inner layers are considered.

The effect of transverse cracks on the redistribution of stress fields under the action of transport loads is analyzed. In the case where the coating has no cracks, the greatest compressive stresses occur on the top plane of the coating. Tensile stresses predominate in the zone of the third layer. They increase as they approach the contact plane of the third and fourth layers. The maximum values of the tangent stresses are realized at the boundary of the second and third layers, thus being a potential cause of the coating delamination in this zone. If the crack penetrates the first two upper layers, then the greatest compression stress has moved to the fracture mouth, and the tensile stress remains almost unchanged. In the case where a vertical crack penetrates the inner layer, the maximum values of the normal and tangent values occur in the central and edge zones of the load distribution.

A finite element analysis of the effect of the crack on the stress-strain state of the multilayer system is performed. The stress concentration in the crack zones depends largely on the geometry of the crack and its structure at its mouth.

KEYWORDS: AUTOMOBILE ROAD, ROAD COATING STRUCTURE, TRANSPORT LOADS, NORMAL VOLTAGE, TENSION VOLTAGE, TENSION-DEFORMED CONDITION.

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AUTHOR

Shevchuk L. V., Ph.D., National Transport University, assistant department of mathematics, e-mail: ludmilashevchuk25@gmail.com, tel. +380667153633, Ukraine, 01010, Kyiv, Boychuka str.42, of.511, orcid.org/0000-0002-5748-9527

REVIEWER

Gaidaichuk V.V., Ph.D., Engineering (Dr.), professor, Kyiv National University of Structures and Architecture, Head of Department of Theoretical Mechanics, Kyiv, Ukraine.

Loza I.A., Ph.D., Physics and Mathematics (Dr), professor, National Transport University, Head of Department of Theoretical Mechanics, Kyiv, Ukraine.

Article language: Ukrainian

Open Access: http://publications.ntu.edu.ua/visnyk/46/437.pdf

Print date: 15.04.2020

Online publication date: 27.10.2020

 

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