Dynamic Compressive Behavior of a Carbonfiber- Reinforced Composite at Different Temperatures and Strain Rates
摘要
In this study, the compressive behavior of a unidirectional carbon-fiber-reinforced composite in both longitudinal and transverse directions under various temperatures and strain rates was investigated. Its dynamic compressive properties were examined at temperatures of –30, 25, 55, and 85°C by the Hopkinson pressure bar system. The strain rates in longitudinal and transverse compression tests were in the range of 70-125 and 100-320 s–1, respectively. The variations in longitudinal and transverse dynamic compressive strengths with respect to temperature and strain rate are analyzed. It was found that the longitudinal and transverse compressive strengths increased with strain rate and decreased with temperature. The compression failure mechanism and fracture morphology of specimens subjected to similar strain rates at different temperatures were examined. Formulas for the dynamic compressive strengths in the longitudinal and transverse directions were proposed, which took into account variations in the temperature and strain rate. These formulas effectively describe the experimental data obtained in the study.