Abstract:

In order to solve the problem of difficulty in the testing of thermal conductivity of single fiber, based on series-parallel two-phase composite dielectric equivalent thermal conductivity physical model, the paper adopted a transient plane heat source method for testing epoxy resin-fiber composites, and calculated the axial and radial thermal conductivities of single fiber. The results show that this method is achieve the thermal conductivity of fiber, and the fiber axial thermal conductivitv is aignificantly greater than the fiber ardial thermal conductivity, verifying the thermal properties anisotropy of the fiber. Effect of thermal conductivity differences in the composite system of two phases, the volume ratio and physical models, instrumentation, heating power, test time, etc. on the fiber thermal conductivity results is significant. When the thermal conductivity of fiber and resin are quite different, the use of parallel computing model is more accurate, and with increasing of volume fraction, the fiber thermal conductivity increases to the balance. With increasing heating power and test time, the thermal conductivity of the composite system is increased.

Key words: transient plane heat source method, fiber, thermal conductivity, parallel computing model