High Strain Rate Mechanical Properties of Epoxy and Epoxy-Based Particulate Composites

摘要

Polymers and polymer-based particulate composites are becoming increasingly used in aerospace structural applications, where they experience complex, non-static loads. Correspondingly, the high strain rate mechanical properties are of increasing importance. This paper investigates the properties of epoxy - bisphenol-A/diethanolamine epoxy (Epon 826/DEA) - and epoxy-based particulate composites across strain rates from 10~(-3) to 10~5/s. The samples were tested using Instron, traditional split Hopkinson pressure bars (SHPBs) and a miniaturized SHPB for ultra-high strain rates. Additionally, the epoxy samples are tested with dynamic mechanical analysis to look at the effects of time-temperature superposition on the strain rate effects in the samples. The results of the testing are compared to the Hasan-Boyce model for polymers, which has shown good agreement with other epoxy studies, to develop constitutive equations for these materials.