The application provides a three-dimensional anisotropic
composite material heat
conductivity coefficient prediction method and
system, and relates to the technical field of
heat analysis, and comprises the following steps: establishing a
heat transfer unit
cell model of a to-be-detected three-dimensional
composite material in different directions based on structure parameters and material parameters of the to-be-detected three-dimensional
composite material; the to-be-detected three-dimensional composite material is a three-dimensional orthogonal structure; the material parameters comprise first heat
conductivity coefficients of each material; taking
solid heat conduction as a current
heat transfer form, determining equivalent thermal resistances corresponding to the
heat transfer unit
cell model of different regions by using an equivalent
thermal resistance method and the first heat
conductivity coefficients, establishing a heat transfer connection relationship between each equivalent
thermal resistance by combining a Fourier equation and a
thermal resistance network method, and determining first total thermal resistances along each heat transfer direction of the to-be-detected three-dimensional composite material; the heat transfer connection relationship comprises series connection and parallel connection; converting the first total thermal resistances based on overall size parameters of the heat transfer unit
cell model, and determining an equivalent heat conductivity coefficient of a target direction.