Thermal Conductivities of Composite Materials

摘要: A field solution for long wavelengths of the equation heat conduction is obtained a composite material with orthorhombic symmetry. This yields exact expressions three principal thermal conductivities. They are valid any number ortho rhombic constituents and even continuously varying conductivities within elementary cell. For lamellar composite, average expressed directly as integrals over space-dependent conductivi ties. filamentary such explicit only in Wigner-Seitz approximation stepwise variation ele mentary In same manner, conduc tivity cubic symmetry, e.g. isotropic spherical inclusions lattice, calculated. Analogies previous results on diffusion coefficients elastic shear moduli discussed.