METHOD FOR DETERMINING THE COMPLEX THERMAL CHARACTERISTICS orthotropic materials

摘要

Method complex thermophysical characteristics orthotropic material, consisting in that at the sample set probe, which is a substrate having fixed thereto a sensor of the heat flux, an electric heater and temperature sensors, the sample is heated heat constant power, measured density of the heat flux recorded specific capacity of the heat source and is measured at a constant pitch in the temperature of the sample time, wherein the elektronag evatel operate as a square, the temperature is fixed at three points of the sample surface: the point in the central heating and two mutually perpendicular directions, and thermal characteristics determined by the formulas: ;;, - thermal components of x and y axis respectively; μ, η - parameters spatial Fourier cosine transform on coordinates x and y axes, respectively; ℓ - half-width of the heated portion of the square; Ui U- stationary temperature of the test sample surface at points x and y, respectively, -retarded ;;;;;; p, p- parameters of Laplace Integration; p = kp (k 1), - temperature characteristic temporal integral U (t) of the test sample at the point x ;;; θ- component thermal activity z axis, where q * (p) - time integral characteristic thermal flux; λ. - thermal conductivity component of the z direction; - the thermal component in the direction z ;;;;;, - error function; -, - integrated exponential functions, where c- ;; volume heat capacity of the material.