Study On Energy Absorption Characteristics Of Front Longitudinal Beam Of A Passenger Car In Front Impact

With the advent of the industry 4.0 era,the number of national vehicles has increased year by year,which leads to frequent road traffic accidents.According to some investigation,in many traffic accidents,the two cars have the largest proportion of frontal collisions.Due to collisions with cars.Instant safety considerations,focusing on the front longitudinal beam of key components of automotive energy absorption.Firstly,according to the existing research at home and abroad,through theoretical analysis and simulation experiments,the front longitudinal beam is simplified to a finite element model of thin-walled beam with equal cross-section.The influence of shape and size,weakening structure and welding factors on the energy absorption characteristics of the front longitudinal beam is analyzed and verified.From the point of view of geometric parameters,the influence of cross-section shape,thickness and aspect ratio of thin-walled beam is analyzed;the influence of shape and height of induced groove,shape and number of grooves on the surface and their arrangement is mainly analyzed for the weakened structure;and the influence of welding form and spacing of solder joints is mainly analyzed for the welding factors.Secondly,combined with the simulation analysis of a specific vehicle's front longitudinal beam,the original front longitudinal beam is modeled by CATIA software.The model is preprocessed by Hypermesh software and K file is obtained.K file is submitted to LS-DYNA software for solution and calculation,and the calculation results are checked by the postprocessing software Hyperview.Finally,the shortcomings of the original model are analyzed,and the uniform test is designed to optimize the original longitudinal beam effectively.The energy absorption of the improved front longitudinal beam is obviously improved,while the peak acceleration is obviously weakened.The research methods involved in this paper are not only for the front longitudinal beam,but also for other thin-walled components in the vehicle.