A thermal conductivity computation model for carbon fiber reinforced polymer/aramid fiber reinforced polymer bi‐material composites was proposed, where thermal resistances of the fibers and matrix were regarded as the electrical resistances in circuit, and was validated by thermal response test with relative error less than 7.5%. After effect of thickness of the aramid fiber layer and that of heating temperature were discussed, it was applied to analyze the thermal response under the deep‐sea oil‐lifting condition. It was found that: (1) specimen with more than two layers (>0.56 mm) of aramid fibers shows better thermal insulation; (2) the higher the heating temperature is, the better the thermal insulation effect is, especially for specimens with multi‐layer aramid fibers.
Carbon fiber reinforced plastics (CFRP)/titanium alloy (Ti) stacks have been widely used in aviation field due to the superior mechanical properties. During integrated drilling of CFRP/Ti stacks, serious damage occurs in the CFRP layer because of the disparate properties of two stack components. Heat accumulation and thermal induced damage are typical and critical issue during drilling stacks, especially in the interface region. In this study, in order to deeply analyze the thermal influence of the interface region, a numerical model based on the finite difference method is developed to predict the three-dimensional drilling temperature field. Experiments with accurate measurement point are conducted to valid the rational of temperature prediction model. The results confirm that the temperature distributions predicted by numerical study have good agreements with the experimental results and the maximum error is about 10.3%. Furtherly, based on the drilling experiments, it can be found that thermal damage induced by cutting heat occurs as discoloration rings around the hole which could cause the elastic modulus of resin matrix decrease. An empirical model of thermal damage with maximum drilling temperature of the interface region are developed with the correlation of R2 = 0.97. The findings point out that as the maximum drilling temperature exceeds 410 °C, serious thermal damage could occur in the resin matrix of CFRP layer.
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