Crushing characteristics and crashworthiness design of metal/CFRP hybrid material vehicle body components
Metal/carbon fiber hybrid material is composed of low-cost,high ductility aluminum alloy and low-density,high-strength carbon fiber reinforced plastics(CFRP)composite material.Using this hybrid material to design of vehicle body structures can effectively reply multiple pressures brought by lightweight,material cost and collision safety,and further expand ideas and space of vehicle body structure design.Here,unidirectional CFRP(UD-CFRP),woven fabric CFRP(WF-CFRP)and square aluminum alloy thin-walled tube were combined to prepare a series of hybrid material thin-walled structures with different specifications and conduct axial quasi-static compression tests,and reveal crashworthiness of hybrid material thin-walled structures.Based on test results,effects of factors of carbon fiber reinforcement method,layer number and relative position of component materials on crashworthiness of hybrid material thin-walled structures were analyzed.Among them,CFRP/AL(aluminum alloy)hybrid material thin-walled structure exhibited excellent crushing energy-absorption characteristics.In addition,UD-CFRP/AL hybrid material thin-walled structure was introduced into lightweight design of automotive front longitudinal beam by establishing finite element models.Finally,a multi-objective discrete optimization algorithm was used to optimize aluminum alloy thickness and carbon fiber layup angle of UD-CFRP/AL hybrid material front longitudinal beam.The optimization results showed that compared with the initial design scheme,the optimized UD-CFRP/AL hybrid material front longitudinal beam reduces its weight by 34.26％and increases its specific energy-absorption by 42.05％.
万方数据
维普
