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作 者:Dansong Zhang Martin Ostoja-Starzewski
机构地区:[1]Department of Mechanical Science and Engineering,University of Illinois at Urbana-Champaign,Urbana,Illinois 61801,USA [2]Department of Mechanical Science and Engineering,Institute for Condensed Matter Theory and Beckman Institute,University of Illinois at Urbana-Champaign,Urbana,Illinois 61801,USA
出 处:《Theoretical & Applied Mechanics Letters》2019年第5期302-307,I0004,共7页力学快报(英文版)
基 金:supported by the National Science Foundation of United States (Grants IIP-1362146 and CMMI-1462749)
摘 要:Harmonic thermoelastic waves in helical strands with Maxwell–Cattaneo heat conduction areinvestigated analytically and numerically. The corresponding dispersion relation is a sixth-orderalgebraic equation, governed by six non-dimensional parameters: two thermoelastic couplingconstants, one chirality parameter, the ratio between extensional and torsional moduli, the Fouriernumber, and the dimensionless thermal relaxation. The behavior of the solutions is discussedfrom two perspectives with an asymptotic-numerical approach: (1) the effect of thermal relaxationon the elastic wave celerities, and (2) the effect of thermoelastic coupling on the thermal wavecelerities. With small wavenumbers, the adiabatic solution for Fourier helical strands is recovered.However, with large wavenumbers, the solutions behave differently depending on the thermalrelaxation and chirality. Due to thermoelastic coupling, the thermal wave celerity deviates from theclassical result of the speed of second sound.Harmonic thermoelastic waves in helical strands with Maxwell–Cattaneo heat conduction are investigated analytically and numerically. The corresponding dispersion relation is a sixth-order algebraic equation, governed by six non-dimensional parameters: two thermoelastic coupling constants, one chirality parameter, the ratio between extensional and torsional moduli, the Fourier number, and the dimensionless thermal relaxation. The behavior of the solutions is discussed from two perspectives with an asymptotic-numerical approach:(1) the effect of thermal relaxation on the elastic wave celerities, and(2) the effect of thermoelastic coupling on the thermal wave celerities. With small wavenumbers, the adiabatic solution for Fourier helical strands is recovered.However, with large wavenumbers, the solutions behave differently depending on the thermal relaxation and chirality. Due to thermoelastic coupling, the thermal wave celerity deviates from the classical result of the speed of second sound.
关 键 词:HELICAL STRANDS Maxwell-Cattaneo heat conduction Thermal RELAXATION Dispersion RELATION
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