Research On Biomimetic Material Characteristics Of Vehicle Crash Test Dummy

The finite element method is one of the most important methods in the researchof vehicle crash safety. Finite element model of vehicle crash test dummy isindispensable in this method. The result of vehicle finite element research is partlyaffected by the accuracy of finite element model of dummy which is greatlydetermined by the accuracy of its material parameters. Dummy skin is an importantpart of dummy, but there is few research on the material model and parameters ofdummy skin in finite element analysis at present. Default material parameter ofdummy skin in finite element model of dummy which is developed by the companyLSTC is used commonly. However, it is showed from the literature research that thematerial model is not the most suitable material model for dummy skin. Accordingly,proposing a feasible research method on dummy skin material is significantlyimportant to improve the accuracy of finite element model of dummy.A reverse method based on test, finite element analysis and optimization wasproposed to research the material parameters of dummy head skin and knee skin insimulation. Two-term OGDEN model was selected for dummy skin according to theliterature. Test plan was made according to the two-term OGDEN model and physicaltest method of rubber. Test samples of dummy head and knee skin were produced anda series of uniaxial compression tests in different strain rates (0.001s-1,0.01s-1,0.1s-1and2s-1) are conducted. Finite element model of the test was built in LS-DYNA.Material parameters of two-term OGDEN were calculated in reverse with the software1stOpt and optimized in the software LS-OPT.Calibration tests of dummy head and knee were conducted. Dummy head droptests and knee impact tests in different velocity were conducted by c hanging the dropheight. Material parameters of dummy skin in finite element analysis were set withthe optimization parameters. The results show that the simulation curves agree wellwith the test curves. Therefore, the reverse method in this paper is eff ective incalculating material parameters of crash test dummy skin and can provide accuratematerial parameters of dummy skin in the development of dummy finite elementmodel.