Numerical Study On Energy-Absorption Structure Crashworthiness In Crash

Vehicle safety is one of the principal problems of society at present. Meanwhile,how to improve the crashworthiness in crash has been an assignable issue during thestudy of passive safety. Researches of automotive crashworthiness are mainlyconcentrated on the energy absorption performance of components of the car bodyduring impact events. As the most conventional and effective energy-absorptionstructure, the metallic thin-walled components have been widely used in theautomotive design and manufacture. Unless affected by the material characteristicsof the components, the metallic thin-walled components also have close relationswith some dimensional parameters such as cross-sectional shape and size, thickness,the type of trigger and so on. Therefore, the crashworthiness research on therelationship between thin-walled metallic components and the above parameters thataffect its energy-absorbed characteristics play a key role in improving the crashperformance and optimizing the structure design, and have an important guidance onthe design of the automotive crash safety.This paper Summarize and analyze the progress and current status of theautomobile body structural crashworthiness research of domestic and foreign. BeforeNumerical Study on Energy-Absorption Structure Crashworthiness, variety offactors, which may affect the accuracy of the simulation results in the process of thefinite element modeling of the automobile collision, are carried on research; thepurpose is to discuss how to improve the simulation accuracy by the constraints ofthe various modeling factors. Subsequently, the influencing factors ofenergy-absorption performance, that some dimensional parameters such ascross-sectional shape and size, thickness, the type of trigger have been discussed,and the assessment criteria of Energy-Absorption Structure Crashworthiness and thestructural design parameters has been given. It initially identified the basicprinciples of the structure design of thin-walled component. On this basis, thequasi-static simulation model of thin-walled structure is built，which will be studiedon crashworthiness simulation and analysis with LS-DYNA as a calculation tool.According to the method of experimental design, a series of discrete design ofsample points will be selected. Through the extraction of the test results, thepossible functional relationship between the mean crushing force and structure of the geometry and material parameters will be carried on regression analysis.For the problem of deriving the mathematical expression of the average crushingforce of the crashworthiness parameters for complex cross-section thin-walled beamthrough the theory, this paper This paper presents a method of regression analysistogether with explicit finite element technique to solve it. To hat thin-walledcomponent as an example, the feasibility and established of researches of automotivecrashworthiness have been tested by the comparative analysis of average collisionforce model obtained by regression analysis and the simulation results and thetheoretical formula by plastic hinge analysis, which will be provide a reference forthe future energy absorbing component crashworthiness design and vehicle crashsimulation.This results of thesis show that the statistical methods of regression analysistogether with explicit finite element technique is used to study the crashworthinessof Energy-Absorption components, which avoid a large number of tests to improveefficiency and the fitting results of which are very accurate. Meanwhile, the researchmethods can also be an important reference for the study on the design parameters ofEnergy-Absorption Structure Crashworthiness.