Research On The Low-speed Crash Box Of Automobile Based On Bionics

Safety has been a core technology of automotive development. China’s transport systemhuman, vehicle, road and environmental complex, is the world’s typical mixed trafficdominated country, especially in urban road traffic order chaos, people and vehicles densecomplex, low vehicle speeds, poor capacity Therefore, the growing number of car accidents,mainly for low-speed collisions. In order to improve the safety performance of the car at lowspeed collision, the paper focuses on low-energy absorption cassettes structural optimization,based on animal joints cushion energy absorption characteristics, and by studying therheological properties of shear thickening fluid, using functional bionic Principles oflow-energy-absorbing design bionic box. Future research aimed at car crash safety and passivesafety, especially designed to provide new ideas, theories and methods in accordance with thereference.Rheological experiments show that, with the shear rate becomes larger, after the firstdecrease the viscosity increased, showed shear thinning and shear thickening behavior, whichis due to changes in the system due to internal molecular structure. And the viscosity waspositively correlated with the concentration, because the concentration of the larger forcesbetween particles and dispersion medium becomes larger. Temperature on the critical shearrate system is large, and the higher the temperature, the greater the critical shear rate, which isdue to the temperature rise can result in an increase. Due to the angular frequency increaseswill lead to hydrogen bonding between the particles and the water molecules will producefracture, thus, resulting in a system of dynamic critical shear stress becomes larger.Through the observation of particle size and morphology of starch granules analysis,discussed the impact of the mechanism of its thickening and internal factors. When the lowshear rate or stress, the original stable internal system is slowly disintegrate, causing theviscosity decreases; when the system reaches a critical shear rate or stress, the system willoffset the interaction forces between the particles force, this When the viscosity reaches a minimum. When the shear rate or stress is further increased, the fluid force will beindependent of the starch granules induced aggregates of particles generated clusters, thesystem appears to thicken behavior.Nonlinear finite element simulation method, focusing on the analysis and discussion ofthe energy absorption during a crash boxes of different factors on the energy absorptioncapability box cushion the impact energy absorption. Were obtained in a rectangularcross-sectional shape, a regular tetragon, hexagon, octagon, and the value is rounded at eachevaluation parameter, the maximum acceleration integrated, the maximum impact load andspecific energy absorption of the three parameters, to a circular cross section structure modelfor the study, discusses the wall thickness of1.0mm,1.2mm and1.5mm when absorbing boxcushion the impact energy absorption properties. Finally, through the analysis of failure modesunder different energy absorption and dispersion of energy dissipation pathways box.Shock drop test by comparing the bionic energy-absorbing boxes and boxes of ordinaryenergy-absorbing cushion energy absorption characteristics, and impact loads, accelerationand energy absorption than as a comprehensive evaluation parameter index. Shear thickeningfluid filling draw bionic energy absorption cell has a higher than normal energy-absorbingcushion absorbing box, relative to improve the energy absorption efficiency of19.2%, and thedeformation displacement are more reduced by22.8%. And the impact of elastic deformationand buckling process is divided into zones on the basis of its failure modes.