Transient analysis of frictionally excited thermoelastic instability in multi-disk clutches and brakes

L. Afferrante; M. Ciavarella; P. Decuzzi; G. Demelio

doi:10.1016/S0043-1648(02)00306-X

Transient analysis of frictionally excited thermoelastic instability in multi-disk clutches and brakes

L. Afferrante, M. Ciavarella, P. Decuzzi, G. Demelio

Academic Institute

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

A 2D multilayered model has been considered to estimate the transient evolution of temperature and pressure perturbations in multi-disk clutches and brakes during operation. The model proposed by Decuzzi et al. [1] has been modified here to estimate the variation of b-perturbation growth rate-with V-relative sliding speed. It has been verified that the perturbation with the lowest critical speed has also the highest growth rate, and that low frequency perturbations are less critical than high frequency perturbations, at fixed critical speed. Therefore, when comparing perturbations with identical critical speed, those with higher wave numbers are responsible for more intense thermomechanical damages. Also, for perturbations with wave number smaller than the critical m_cr , the temperature increases with m; vice versa for perturbations with wave number larger than m_cr the temperature decreases with m. A reduction in thickness ratio a₁/a₂ between friction and metal disks has the effect of increasing the temperature and growth rate. An approximate formula for the temperature variation with time has been derived for a linearly decreasing engagement speed.

Original language	English (US)
Pages (from-to)	136-146
Number of pages	11
Journal	Wear
Volume	254
Issue number	1-2
DOIs	https://doi.org/10.1016/S0043-1648(02)00306-X
State	Published - Jan 2003

Keywords

Brakes and clutches
Hot spotting
Thermoelastic instability

ASJC Scopus subject areas

Engineering(all)
Mechanical Engineering
Surfaces, Coatings and Films

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10.1016/S0043-1648(02)00306-X

Cite this

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title = "Transient analysis of frictionally excited thermoelastic instability in multi-disk clutches and brakes",

abstract = "A 2D multilayered model has been considered to estimate the transient evolution of temperature and pressure perturbations in multi-disk clutches and brakes during operation. The model proposed by Decuzzi et al. [1] has been modified here to estimate the variation of b-perturbation growth rate-with V-relative sliding speed. It has been verified that the perturbation with the lowest critical speed has also the highest growth rate, and that low frequency perturbations are less critical than high frequency perturbations, at fixed critical speed. Therefore, when comparing perturbations with identical critical speed, those with higher wave numbers are responsible for more intense thermomechanical damages. Also, for perturbations with wave number smaller than the critical mcr , the temperature increases with m; vice versa for perturbations with wave number larger than mcr the temperature decreases with m. A reduction in thickness ratio a1/a2 between friction and metal disks has the effect of increasing the temperature and growth rate. An approximate formula for the temperature variation with time has been derived for a linearly decreasing engagement speed.",

keywords = "Brakes and clutches, Hot spotting, Thermoelastic instability",

author = "L. Afferrante and M. Ciavarella and P. Decuzzi and G. Demelio",

note = "Funding Information: The authors wish to thank Prof. James R. Barber of the University of Michigan for his helpful comments and to acknowledge the Center of Excellence in Computational Mechanics at the Politecnico di Bari for financial support. Paolo Decuzzi wish to thank Raybestos Products Company for supporting his stay at the University of Michigan and at RayTech.",

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AU - Decuzzi, P.

AU - Demelio, G.

N1 - Funding Information: The authors wish to thank Prof. James R. Barber of the University of Michigan for his helpful comments and to acknowledge the Center of Excellence in Computational Mechanics at the Politecnico di Bari for financial support. Paolo Decuzzi wish to thank Raybestos Products Company for supporting his stay at the University of Michigan and at RayTech.

PY - 2003/1

Y1 - 2003/1

N2 - A 2D multilayered model has been considered to estimate the transient evolution of temperature and pressure perturbations in multi-disk clutches and brakes during operation. The model proposed by Decuzzi et al. [1] has been modified here to estimate the variation of b-perturbation growth rate-with V-relative sliding speed. It has been verified that the perturbation with the lowest critical speed has also the highest growth rate, and that low frequency perturbations are less critical than high frequency perturbations, at fixed critical speed. Therefore, when comparing perturbations with identical critical speed, those with higher wave numbers are responsible for more intense thermomechanical damages. Also, for perturbations with wave number smaller than the critical mcr , the temperature increases with m; vice versa for perturbations with wave number larger than mcr the temperature decreases with m. A reduction in thickness ratio a1/a2 between friction and metal disks has the effect of increasing the temperature and growth rate. An approximate formula for the temperature variation with time has been derived for a linearly decreasing engagement speed.

AB - A 2D multilayered model has been considered to estimate the transient evolution of temperature and pressure perturbations in multi-disk clutches and brakes during operation. The model proposed by Decuzzi et al. [1] has been modified here to estimate the variation of b-perturbation growth rate-with V-relative sliding speed. It has been verified that the perturbation with the lowest critical speed has also the highest growth rate, and that low frequency perturbations are less critical than high frequency perturbations, at fixed critical speed. Therefore, when comparing perturbations with identical critical speed, those with higher wave numbers are responsible for more intense thermomechanical damages. Also, for perturbations with wave number smaller than the critical mcr , the temperature increases with m; vice versa for perturbations with wave number larger than mcr the temperature decreases with m. A reduction in thickness ratio a1/a2 between friction and metal disks has the effect of increasing the temperature and growth rate. An approximate formula for the temperature variation with time has been derived for a linearly decreasing engagement speed.

KW - Brakes and clutches

KW - Hot spotting

KW - Thermoelastic instability

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Transient analysis of frictionally excited thermoelastic instability in multi-disk clutches and brakes

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