Failure Behavior of Aluminum-CFRPs Hybrid Tube Beam under Bending Collapse Load

摘要

Aluminum (Al) / CFRPs hybrid composites tube beam was proposed for the frame of super-light electric vehicles to reduce weight without compromising safety characteristics. Composites tube beam shows catastrophic failure mode under both axial and transverse load so that it may not absorb enough energy. However, when metal and composites are used together, the plastic deformation of metal guides the fracture behavior of composites so that the catastrophic failure mode of composites can be transferred to progressive failure mode, and energy absorption characteristics would be improved. The Al tube beam was reinforced by CFRPs, and the specimen was co-cured in the autoclave curing process. Three point bending tests were performed to the specimen with five kinds of lay-up sequence and three kinds of laminate thickness. The failure behavior of composites and the bending collapse behavior of hybrid tube beam were different depending on the lay-up sequence and laminate thickness, and they influenced to the load-displacement curve. The specific energy absorbed (SEA) value was improved by 29.58% on the hybrid tube beam with specific lay-up sequence and laminate thickness condition compared to Al tube beam.