Abstract
The flexural behavior of hybrid composite rods used in high capacity low sag overhead conductors at elevated temperatures is experimentally investigated. Dynamic mechanical analysis (DMA) is carried out on pultruded carbon/glass/epoxy specimens, followed by three-point bending experiments at different elevated temperatures. The failure mechanisms are examined by using macro/micro images taken from the failed specimens. The results show that flexural properties such as strength and modulus decrease as temperature increases. The failure mode of hybrid composite rods is also found highly temperature-dependent. A new simple model is developed based on DMA data to predict the flexural strength of high-performance polymeric composites at different temperatures. The predictions are in good agreement with the experimental data.
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