Crashworthiness Analysis And Optimization Design Parameterized Model Of Thin-walled Components

With the various motor vehicles and increasing traffic accidents, the improvement of thesafety about the vehicles becomes crucial, while the collision accidents are the main factor ofroad traffic accidents. How to improve the crashworthiness of vehicles is one of the mostimportant parts during the study. The crashworthiness of the vehicles mainly depends on theperformance of energy absorption. Due to the high energy absorption of thin-walled metalstructures are widely used in the device, this paper lays special emphasis on thecrashworthiness of metal thin-walled structures under the condition of high velocity impactwith the response surface method and optimization designs on metallic thin-walled tubes. Themain points are as follows:This paper fitstly describe the current study on vehicles crashes, thin-walled components’energy absorbing characteristics and crashworthiness optimization. then explains absorbingenergy principle and deformation characteristics of representative thin-walled circular tubeand square tube. Meanwhile the paper introduces the common appraoches on thin-walledcomponents crashworthiness and the common index of evaluation, and the performance of thematerials. Then, with nonlinear finite element software LS-DYNA, get the results accordingto different shapes, the study of cross-section becomes the thin-walled components under thecondition of impacts from differnet angles, the research can be further widely used.Thin-walled componets with circular cross-section is the most classical energy-absorbingstructures. On the basis of former study, with the deformation principle of groove andpetticoat, the paper studies the performance of it under the conditon of axial high velocityimpact. and explains the samples of crashworthiness optimization and response surface approximation theory，it is the summary of ideal point method, the basic principle and solvingprocess of genetic algorithm. Getting the crash response from different geometricconfiguration of thin-walled components with nonlinear finite element software LS-DYNA,taking the quantities and radiuses as design variables. Making the speific energy absorptionand crash force effective as optimal aims, with apporximation function of response surfaceoptimization to build up multi-target optimum of thin-walled components, and multi-targetoptimization designs on groove and petticoat, then getting the results. While the distributionof groove and petticoat in the form of unequally distribution, setting the alternate groove andpetticoat on the thin-walled componnets, analyzing the impact of radium, the positon and thedistance on crashworthiness, and setting up multi-target crashworthiness optimal design onthe basis of evaluation index.This paper provides us vital technical references of energy absorption, explicit finiteelement technique together with response surface method is used to solve contact-impactproblems, which have been proved to be a high efficiency method and the fitting results ofwhich are very accurate. The paper and conclusions can also be an important reference for thecrashworthiness of energy absorption components.