Interaction of thermal contact resistance and frictional heating in thermoelastic instability

Ciavarella, M.; Johansson, Lars; Afferrante, L.; Klarbring, Anders; Barber, J. R.

doi:10.1016/s0020-7683(03)00313-5

Cited by 42 publications

(21 citation statements)

References 22 publications

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“…2. For higher sliding speeds, we anticipate that the contact pressure will grow without limit, causing the system to seize (Ciavarella et al 2003).…”

Section: Problem Statementmentioning

confidence: 99%

Sliding thermoelastodynamic instability

2006

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Numerous mechanisms can give rise to instabilities and vibrations in sliding systems. These can generally be characterized as either elastodynamic (e.g. 'brake squeal') or thermoelastic. The time-scales of these processes differ considerably, so it is usual to neglect coupling between them, i.e. to neglect thermal effects in elastodynamic analyses and to use the quasi-static approximation in thermoelastic analyses. In the present paper, we consider the potential coupling between them in the simplest possible context-a thermoelastodynamic layer sliding against a rigid plane and constrained to one-dimensional displacements. The results show that although the coupling is extremely weak, it has a destabilizing effect on the natural elastodynamic vibration of the layer at arbitrarily low sliding speeds. A numerical solution of the transient equations below the quasi-static critical speed shows that an initial disturbance grows exponentially until periods of separation develop, after which the system approaches asymptotically to a steady state involving periods of contact and separation alternating at the lowest natural frequency of the elastodynamic system. With increasing sliding speed, the proportion of the cycle spent in contact is reduced and the maximum contact pressure increases.It is important to note that neither a quasi-static thermoelastic analysis, nor an elastodynamic analysis neglecting thermal expansion would predict instability in this speed range. Similar instabilities due to thermoelastodynamic coupling are almost certain to occur in more complex practical sliding systems such as brakes and clutches, implying the need for the incorporation of these effects in commercial analysis software. The proposed mechanism might also provide an explanation of reported experimental observations of vibrations normal to the contact interface during frictional sliding.

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“…2. For higher sliding speeds, we anticipate that the contact pressure will grow without limit, causing the system to seize (Ciavarella et al 2003).…”

Section: Problem Statementmentioning

confidence: 99%

Sliding thermoelastodynamic instability

2006

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“…There is another interesting feature that is called thermoelastic instability (TEI) in the literature, which is responsible for the appearance and moving of hot spots in the apparent contact area. The TEI was investigated in a number of papers (e.g., in [7][8][9][10][11]), and it was found to be caused by the joint effect of wear and thermal expansion of the high-temperature hot spots. present paper shows experimental and numerical analysis of the thermal and tribological processes of the wheel/brake block system during braking, particularly in the running-in phase.…”

Section: Introductionmentioning

confidence: 99%

Contact Thermal Analysis and Wear Simulation of a Brake Block

Békési

Váradi

2013

Advances in Tribology

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The present paper describes an experimental test and a coupled contact-thermal-wear analysis of a railway wheel/brake block system through the braking process. During the test, the friction, the generated heat, and the wear were evaluated. It was found that the contact between the brake block and the wheel occurs in relatively small and slowly moving hot spots, caused by the wear and the thermal effects. A coupled simulation method was developed including numerical frictional contact, transient thermal and incremental wear calculations. In the 3D simulation, the effects of the friction, the thermal expansion, the wear, and the temperature-dependent material properties were also considered. A good agreement was found between the results of the test and the calculations, both for the thermal and wear results. The proposed method is suitable for modelling the slowly oscillating wear caused by the thermal expansions in the contact area.

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“…Furthermore, they studied the contact problem of an insulating rigid flat-ended punch on a thermally conducting half-plane and analyzed a more general problem of a thermal conducting cylinder sliding over the surface of an elastic half-plane with different thermal properties [38]. An interesting phenomenon is that, when sufficient frictional heat is produced between two contacting bodies, the two solids may separate from each other due to the thermal effect [39,40], which has been successfully explained by Afferrante and Ciavarella [41,42].…”

Section: Introductionmentioning

confidence: 99%

Thermo-contact mechanics of a rigid cylindrical punch sliding on a finite graded layer

Chen

Peng

2012

Acta Mech

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A steady-state thermo-contact model of a rigid insulated cylinder of radius R sliding on a finite graded elastic layer is studied, whose Young's modulus, thermal conductivity coefficient and thermal expansion coefficient vary exponentially in the thickness direction. The transfer matrix method and Fourier integral transform technique are used to obtain a Cauchy-type singular integral equation for the contact stresses. Numerical calculation yields the interface traction and temperature distributions below the rigid punch. It shows that crack damage in the finite graded layer due to the frictional sliding can be prevented by several alternative ways, such as decreasing the shear modulus ratio of the surface to the bottom, decreasing the friction coefficient, increasing the thickness of the finite graded layer, increasing the thermal conductivity coefficient ratio of the surface to the bottom or increasing the sliding velocity. The finding should be very useful for the design of novel graded materials with potential applications in aerospace, tribology, coatings, etc.

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Interaction of thermal contact resistance and frictional heating in thermoelastic instability

Cited by 42 publications

References 22 publications

Sliding thermoelastodynamic instability

Sliding thermoelastodynamic instability

Contact Thermal Analysis and Wear Simulation of a Brake Block

Thermo-contact mechanics of a rigid cylindrical punch sliding on a finite graded layer

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