REFINEMENT OF THE UPPER AND LOWER BOUNDS OF EFFECTIVE HEAT CONDUCTIVITY COEFFICIENTS OF RIB-REINFORCED COMPOSITE MEDIA

We propose two refi ned structural models of the thermal behavior of a rib-reinforced composite medium at general anisotropy of the materials of compound components. For the criterion of equivalence of the rib-reinforced composite to the fi ctitious homogeneous anisotropic material, equality of the specifi c heat dissipation in them was used, which permits determining the upper and lower bounds of the effective heat conductivity coeffi cients of the composite material. The design values of the effective heat conductivity coeffi cients of a honeycomb structure with cavities fi lled and not fi lled with foam plastic have been determined. It has been shown that the refi nement of certain thermal characteristics of 12%, and the refi ned "fork" of values of these quantities, does not exceed 2.5%. Indirect comparison has been made between the calculated and experimental values of the effective heat conductivity coeffi cients of such compounds, which has shown that the results obtained in the work are qualitatively reliable
We propose two refi ned structural models of the thermal behavior of a rib-reinforced composite medium at general anisotropy of the materials of compound components. For the criterion of equivalence of the rib-reinforced composite to the fi ctitious homogeneous anisotropic material, equality of the specifi c heat dissipation in them was used, which permits determining the upper and lower bounds of the effective heat conductivity coeffi cients of the composite material. The design values of the effective heat conductivity coeffi cients of a honeycomb structure with cavities fi lled and not fi lled with foam plastic have been determined. It has been shown that the refi nement of certain thermal characteristics of 12%, and the refi ned "fork" of values of these quantities, does not exceed 2.5%. Indirect comparison has been made between the calculated and experimental values of the effective heat conductivity coeffi cients of such compounds, which has shown that the results obtained in the work are qualitatively reliable
Author:  A. P. Yankovskii
Keywords:  heat conductivity, composites, rib reinforcement, structural theories, general anisotropy, dissipative equivalence, effective characteristics, light fi ller, ribbed structures
Page:  1014