Research On The Influences Of Manufacture Parameters Of Hybrid Ⅲ Dummy Chest Bionic Components On Dummy Test Performance

Anthropomorphic test dummy and its finite element model are the essential tool to evaluate the safety of vehicle.Recently,dummy development technology is monopolized by foreign enterprise.Our state is lack of fundamental research and self-developing capability for dummy.In this paper,the effects of the manufacture process parameters of the dummy bionic material on their mechanical properties and on the calibration of the dummy components and dummy injury indicators were studied.The paper is divided into three parts.First of all,the mechanical tests of bionic materials were conducted and the material parameters of the polyethylene skin and the polyurethane foam were reversely optimized based on the experiment and simulation.The results show ed that the higher vulcanization temperature and the longer the vulcanization time,the more compressive and tensile mechanical properties of skin samples.The results also showed that the greater the foam density and the raw material ratio,the more compressive intensity of the foam samples.Using the 1st Opt and LS-OPT software,the material parameters of polyethylene skin and polyurethane foam under various manufacture process parameters were optimized.Secondly,the method of combining simulation and experiment was used to study the effects of manufacture parameters on the calibration performance of dummies’ head and abdomen.The results showed that the increase of vulcanization time and vulcanization temperature will cause the decrease of peak resultant acceleration of head.As for abdomen,the ratio of foam raw material has a significant effect on the mechanical properties of the abdomen under quasi-static and dynamic impact compression.The effects of the mechanical properties of dummy abdomen,chest jacket and chest pad on the evaluation parameters of high-speed calibration of the dummies chest were studied.The results showed that the chest impact force is positively correlated with the foam raw material ratio of the abdomen.The chest deflection is negatively correlated with the ratio,the hyster esis rate does not change much and show no exact law.As for jacket,the chest impact force increased with the increase of vulcanization temperature and time.The chest deflection and the hysteresis rate decreased with the increase of vulcanization temperature and time,which was negatively correlated.The chest impact force and chest deflection are positively correlated with the stiffness of chest pad,and the hysteresis rate is negatively correlated.Finally,the effects of the change of manufacture parameters of the polyethylene skin and polyurethane foam on the dummies’ impact response on vehicle crash were studied.The results showed that the change of mechanical properties of the bionic material affects the main injury criteria of the dummy such as head acceleration,chest acceleration,chest deflection,VC value and WIC value,but the law is not exact.The results of the study can be used to guide the determination of the production process of bionic components and to ensure the quality and performance o f dummy components.It can be used to develop new dummies suitable for other conditions and improve the ability to develop and simulate dummies.It can provide a more accurate tool for the automotive safety field.