Crushing Behavior of Thick Circular High Strength Aluminum Tube Against Quasi-static Axial Loading

摘要

The present study investigates the crushing performance of circular tube, made of high strength aluminum alloy AA-7005 and AA-7075 by numerically and experimentally. The tubular structures were exposed to quasi-static axial loading with variation in length (51, 68 and 85 mm) while diameter (34 mm) and thickness (3.55 mm) kept constant. The uni-axial tension tests for both the material were carried out to explore the behavior of stress-strain which was used as input for numerical simulations. The quasi-static compression test was conducted on Instron compressive testing machine while for simulation finite element code LS-Dyna was used. The crashworthiness parameters such as initial maximum peak load, crash force efficiency, energy absorption capacity, and specific energy were found from the obtained deformation behavior of structures. It is found that the tubular structures made of AA-7005 show higher crash force efficiency whereas the structures made of AA-7075 absorb significantly higher energy during the collapse.