Thermal and thermomechanical phenomena in sliding contact

Bogdanovich, P. N.; Tkachuk, D. V.

doi:10.3103/s1068366609030015

Cited by 27 publications

(27 citation statements)

References 51 publications

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“…When analyzing the obtained results, it should be taken into account the fact that the set of dimensionless time t=t s , in Figures 4, 5, 6, and 8, requires specific approach, for Table 2. Coefficients in the approximation formula for the dependencies of the thermophysical properties of materials K d, p , c d, p and Brinell hardness HB p on temperature T. (4) c (5) HB Ã HB (0) (MPa) HB (1) HB (2) HB (3) (8C À1 ) T HB1 (8C) HB (4) HB (5) Table 3. Coefficients in the formula for the dependencies of the coefficient of friction f and wear rate I on the temperature T at the nominal contact pressure p 0 = 1:47 MPa.…”

Section: Numerical Analysismentioning

confidence: 99%

Finite element solution of the three-dimensional system of equations of heat dynamics of friction and wear during single braking

Grześ

2018

Advances in Mechanical Engineering

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A three-dimensional numerical model of a disk brake to study temperature on a discrete contact of rough surfaces has been developed. It includes the system of equations formulated based on thermotribological postulates of heat dynamics of friction and wear with mutual influence of contact pressure, velocity, properties of materials, and temperature. Two approaches of calculation of the flash temperature and its influence on the maximum temperature during a single braking application were studied. Changes in the contact temperature, sliding velocity, and the thermomechanical wear during braking were shown and discussed. It was found that two of the examined variants of calculation of the flash temperature agree well for the three considered materials of the brake pads combined with the cast iron disk, at each initial sliding velocity in the range from 5 to 20 m s 21 .

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Section: Numerical Analysismentioning

confidence: 99%

Finite element solution of the three-dimensional system of equations of heat dynamics of friction and wear during single braking

Grześ

2018

Advances in Mechanical Engineering

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“…(A.2) we recognize the separate contributions from the elastic thin plate and the substrate, modelled as a set of harmonic oscillators with spring constant k given by Eq. (16).…”

Section: Aknowledgementsmentioning

confidence: 99%

“…Our observations of cracking phenomena (Section 2) show that i) the entire main crack-pattern forms suddenly at all locations and at the same time on the surface, ii) this occurs before any actual charring and iii) the patterns are quasi-periodic. These are typical features of a mechanical instability phenomenon of buckling [12,13,14,15,16].…”

Section: Introductionmentioning

confidence: 97%

A thermomechanical explanation for the topology of crack patterns observed on the surface of charred wood and particle fibreboard

Baroudi

Ferrantelli

et al. 2017

Combustion and Flame

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In the assessment of wood charring, it was believed for a long time that physicochemical processes were responsible for the creation of cracking patterns on the charring wood surface. This implied no possibility to rigorously explain the crack topology. In this paper we show instead that below the pyrolysis temperatures, a primary global macro-crack pattern is already completely established by means of a thermomechanical instability phenomenon. First we report experimental observations of the crack patterns on orthotropic (wood) and isotropic (Medium Density Fibreboard) materials in inert atmosphere. Then we solve the 3D thermomechanical buckling problem numerically by using the Finite Element Method, and show that the different crack topologies can be explained qualitatively by the simultaneous thermal expansion and softening, taking into account the directional dependence of the elastic properties. Finally, we formulate a 2D model for a soft layer bonded to an elastic substrate, and find an equation predicting the inter-crack distance in the main crack-pattern for the orthotropic case. We also derive a formula for the critical thermal stress above which the plane surface will wrinkle and buckle. The results can be used for finding new ways to prevent or delay the crack formation, leading to improved fire safety of wood-based products.

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“…Application of the law of friction in the form of (1) allows to simplify the boundary conditions for the primary problem, however, a choice of more difficult models of friction incorporating Eqs (1), (2) (Goryacheva, 2001;Sulym and Piskozub, 2004;Pasternak et al, 2010;Popov, 1966;Johnson, 1985;Hills et al, 1993), which account for wear and thermal emissions (Bogdanovich and Tkachuk, 2009; Pyrjev et al, 2012; Datsyshyn and Kadyra, 2006; Goryacheva et al, 2001), will not essentially complicate the solution process.…”

Section: Fig 1 the Loading And Geometric Scheme Of The Problemmentioning

confidence: 99%

Antiplane Deformation of a Bimaterial Containing an Interfacial Crack with the Account of Friction I. Single Loading

Sulym

Piskozub

et al. 2015

Acta Mechanica Et Automatica

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The paper presents the exact analytic solution to the antiplane problem for a non-homogeneous bimaterial medium containing closed interfacial cracks, which faces can move relatively to each other with dry friction. The medium is subjected to the action of normal and arbitrary single loading in a longitudinal direction. Based on the discontinuity function method the problem is reduced to the solution of the system of singular integral-differential equations for stress and displacement discontinuities at the possible slippage zones. Influence of loading parameters and the effects of friction on the sizes of these zones is analyzed. The stress intensity factors, stress and displacement discontinuities, energy dissipation are determined for several characteristic types of external loading.

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Thermal and thermomechanical phenomena in sliding contact

Cited by 27 publications

References 51 publications

Finite element solution of the three-dimensional system of equations of heat dynamics of friction and wear during single braking

Finite element solution of the three-dimensional system of equations of heat dynamics of friction and wear during single braking

A thermomechanical explanation for the topology of crack patterns observed on the surface of charred wood and particle fibreboard

Antiplane Deformation of a Bimaterial Containing an Interfacial Crack with the Account of Friction I. Single Loading

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