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Modeling FGM brake disk against global thermoelastic instability (hot‐spot)
Author(s) -
Hernik S.
Publication year - 2009
Publication title -
zamm ‐ journal of applied mathematics and mechanics / zeitschrift für angewandte mathematik und mechanik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.449
H-Index - 51
eISSN - 1521-4001
pISSN - 0044-2267
DOI - 10.1002/zamm.200800121
Subject(s) - thermoelastic damping , isotropy , brake , materials science , instability , disc brake , composite number , convection , mechanics , homogeneous , composite material , thermal , physics , thermodynamics , optics , metallurgy
This paper deals with study of the global thermoelastic instability of brake disk made of either the isotropic homogeneous metal matrix composite (MMC) or the isotropic inhomogeneous functionally graded material composite (FGM). The main idea of the FGM composite is a smooth variation of material properties due to continuous change in microstructure. The estimates in diffusion equation are characterized both by non‐stationary heat flux and non‐stationary heat convection terms enhanced by the characteristic frictional heat sources. Global instability is characterized by the Schaefer–Papkovich condition. Application of functionally graded A356R‐based composite to brake disk structure prevents loss of global stability in contrast with homogeneous A356R composite and stainless steel ASTM321 brake disk which guaranties safety and durability of the braking system.