Frictionally excited thermoelastic instability in viscoelastic and poroelastic media

被引:2
作者
Decuzzi, P [1 ]
机构
[1] Politecn Bari, Dipartimento Ingn Meccan & Gest, I-70126 Bari, Italy
关键词
D O I
10.1016/S0020-7403(01)00101-1
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Friction materials commonly used in sliding applications, such as clutches and brakes, can be poroelastic and exhibit a viscoelastic behaviour. To the author's knowledge, there are no comprehensive analysis of the influence of poroelastic and viscoelastic material properties on the onset of the phenomenon of frictionally excited thermoelastic instability in sliding systems. This issue is here analysed in some details. Firstly, a linear standard model for the friction material is adopted, introducing an effective complex dynamic modulus E = \E\e(jdelta) and individuating three independent parameters, E-1, E-2/E-1 and c(2)/E-1, that fully describe its viscoelastic behaviour. Subsequently, a similarity between viscoelastic and poroelastic formulation is presented and the three independent parameters introduced are related to the viscosity of the fluid mu(f), the permeability k(p) and elastic properties M, alpha(B) of the porous material. The linear elastic formulation proposed by Decuzzi et al. (ASME J. Tribiol. 2001;123:865) has been modified in order to take account of the new constitutive model and the variation of the critical sliding speed with the wave parameter, and viscoelastic/poroelastic properties of the material are examined. It has been found that the susceptibility towards thermoelastic instability increases by increasing both the elastic E-2/E-1 and viscoelastic c(2)/E-1 parameters, or by increasing the Biot modulus M and effective stress coefficient alpha(B), the viscosity mu(f) of the fluid, and by reducing the permeability k(p) of the porous skeleton. It has been shown that for porous friction materials employed in wet clutches which are weakly viscoelastic, the neglect of its poroelastic behaviour leads to an overestimation of the critical speed smaller than 10%. However, much larger variations are predicted for elastomeric and porous materials with more pronounced viscoelastic behaviour. (C) 2002 Elsevier Science Ltd. All rights reserved.
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页码:585 / 600
页数:16
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