Study On Finite Element Evaluation Method Of Blunt Force Traumaand Traffic Injury To The Head

Head injury has been investigated extensively and intensively because of the high injury rate and fatality rate.The in-depth quantitative analysis of injury mechanism caused by blunt and traffic accident is the basic reference for the forensic identification and development of head protective devices.The development of finite element theory and computer technology has become one of the important methods to investigate the Trauma Brian Injury(TBI).Computational biomechanics,as a quantitative evaluation method,will provide valuable data for comprehending the mechanism of craniocerebral injury.The results have important application value for the research and development of head injury protection measures,furthermore,it is useful to reduce the cost of research and development.In this study,the craniocerebral injury mechanism caused by acceleration and deceleration was addressed based on TUST IBMs Head Series.The cases of craniocerebral blunt injury were reconstructed and quantitatively evaluated by using the TUST IBMs Head Series.The accelerated impact model acutely reconstructed craniocerebral blunt injury and predicted the injury severity under different conditions.The craniocerebral injuries were observed more intuitively by analyzing the biomechanical parameters such as intracranial pressure,brain tissue Von Mises stress and maximum principal strain,skull Von Mises stress and plastic strain distribution.These results and methods will provide important references for quantitative evaluation of craniocerebral blunt injury and visualization of forensic identification.The mechanism of craniocerebral acceleration injury caused by blunt instrument impact was studied by parameterized method using the TUST IBMs Head Series.The parametric design of loading conditions was used to simulate the typical craniocerebral blunt injury cases.Furthermore,the response from different loads was analyzed such as the blowing speed,the blunt type and the impact position.The database of craniocerebral acceleration injury was developed.The biomechanical parameters such as stress-strain and intracranial pressure would be used to quantitatively evaluate craniocerebral injury caused by different impact conditions.The mechanism of craniocerebral acceleration injury was investigated by the characteristics of stress wave propagation and stress distribution.In traffic accidents,the traumatic brain injury caused by pedestrian-vehicle collision is a typical deceleration injury.A hybrid pedestrian computational model including the finite element and the multi-rigid body was developed based on the TUST IBMs Head Series and LSTC Hybrid III 50 th percentile dummy model.The process of craniocerebral deceleration injury from pedestrian-vehicle collision was reconstructed by finite element simulation technology,and the effect of contact angle of the vehicle front-end with the pedestrian on craniocerebral injury was analyzed.Comprehended the mechanism of decelerated injury in traffic accidents would be important application values to design the pedestrian protection devices.The tests were set up by simulating the collision from the head with the A-pillar and the A-pillar hitting the head based on the TUST IBMs Head Series.The mechanism of acceleration injury and deceleration injury was explored in-depth based on the stress wave propagation and stress distribution.The difference of stress propagation indicated that the damage characteristics are different.The head deceleration injury is more serious than the acceleration injury acted by the same energy input and the same contact situation.