Effects of the compressive fatigue loading on the thermal conductivity behavior of 2D-C/C composites

The compressive fatigue experiment of 2D-C/C composites was made under the stress level of 1000 N, 2000 N and 3000 N, cycling times of 10 ⁴, 10 ⁵ and 3×10 ⁵, the thermal conductivity behavior is tested before and after the fatigue loading, and the effects of compressive fatigue loading conditions on the thermal conductivity behavior of the composites were investigated. The results show that compressive fatigue loading does not change the law about the thermal diffusivity coefficient and specific heat capacity improve with the increasing temperature. However, after the compressive fatigue loading, the thermal conductivity coefficient, thermal diffusivity coefficient of the samples reduce with the increasing of the stress level and cycling times, while the specific heat capacity change little. The decline of the thermal conductivity is related to the fatigue damages generated and accumulated during the compressive fatigue loading after analysis.