Simulation Analysis Of A TOYOTA Yaris Jordan Rollover Test

The global traffic accident data showed that although the probability of occurrence rollover crash is low,the proportion of death caused by rollover collision is much higher than other forms.Therefore,in order to reduce the casualties in the rolling collision,it is necessary to conduct further research on the safety of the tumbling collision.The forms of rollover collision was more complicated than other ones and was difficult to reproduce.The quasi-static roof compression test was difficult to show characteristics of dynamic rollover.Jordan rollover system was a good test method with good repeatability,which can be used to study the safety of rollover collision.Currently,there has been no hardware condition for the Jordan rollover test because of the high cost and long cycle of collision test.Therefore,It was an effective means to study rolling collision and protect the vehicle occupant that choosing finite element modeling to conduct high-precision analog simulation.This paper provides an effective method for the finite element modeling of Jordan rollover test according to the Jordan rollover test procedure.The specific work is as follows:1.A complete finite element model of Jordan rollover test was built based on the 2010 models of the TOYOTA Yaris finite element model provided by the American National Center of impact analysis,and according to the Jordan rollover impact test parameters from the sdudy on this vehicle model made by University of Virginia.The efficiency of the model can be improved through a certain simplified approach,the model and the experimental results were in good agreement,thus ensuring the accuracy of the model.2.THUMS model was placed in the validated Jordan rollover collision finite element model of the driver's side,to analyze the human body injury.This was first to use THUMS model of human body to analyze the characteristics of dynamic rolling.The results indicated that the body's head was easily damaged during dynamic rolling,and the mainly caused by of the hard contact between the head and the top of the car.Although there was little possibility of injury happened on neck in the initial collision parameters,it was found that the main source of damage was related to the collapse of the roof and the intensity of movement.The chest trauma wass a rib fracture and a pulmonary contusion.3.Dynamic response and damage were analyzed in contrast to the two situations in which the occupant wore seatbelt and not.The results showed that the belts can well restrained the movement of occupant in longitudinal and lateral side in rollover collision,so as to reduce the risk of occupant being dumped out from the car,the seatbelt could effectively reduce head and chest injury of the occupant in rollover collision.4.In order to analyze the impact of the roof strength on the occupant in the rollover crash,the TOYOTA Yaris was analyzed,and the roof was processed to a certain degree of weakening,thus three bodies of different compression grades were obtained.By analyzing the protection of the occupants from three bodies during the rollover crash,it showed that the more pressive strength of the body,the more protective effection the occupant's neck,while also may cause greater damage to the head.