Research On The Mechanism Of The Head-neck Injury Of The Driver With The Neck Muscles Active Force During The 25% Offset Collision

According to statistics,with the development of the automobile industry,the domestic car ownership is also rapidly increasing,and the number of road traffic accidents is also rapidly increasing.In traffic accidents,non-fatal injuries account for a large proportion.There are many types of occupant body injuries,and neck injuries are the most difficult to cure and the most complicated injury mechanism,which brings long-term burden to the injured.In the 1950 s,some people began to study the dynamic response of the head and neck of the occupants in the accident,but all experiments were conducted through corpses or volunteers,which easily touched the bottom line of morality and ethics.Nowadays,there are gradually studies on the dynamic response of human head and neck through finite element numerical simulation,which not only does not violate ethics,but also has a high degree of freedom in experiments,which can be obtained by many volunteers and cadaver experiments.data.The main purpose of this article is to establish a finite element model of the head and neck with muscle driving force and combine it with the HybridⅢ dummy model of the 50 th percentile to obtain the hybrid dummy model.The hybrid dummy model is verified and tested at different strengths.The dynamic response of the head and neck is analyzed under the condition of 25% offset collision,and the dynamics of the structures(cervical vertebrae,intervertebral discs,etc.)in the head and neck model under different collision intensities under active and inactive muscle dynamics are studied and compared.And biomechanical response.This article first statistically analyzes the traffic accident data in recent years,analyzes and understands the importance of head and neck injury research,compares the history and current status of head and neck injury research,and discusses the research significance of head and neck injury;Neck anatomy data,based on a 50 th percentile dummy model,established a neck muscle model and connected it with the basic model,and defined the muscle model material characteristics to reflect the hybrid dummy neck muscle The main dynamic response characteristics of the system are verified and the results show that the hybrid dummy can be used in subsequent experimental simulations.Select a public vehicle model and verify it.The results show that the vehicle model has good reliability,and then a cockpit proxy collision model with a restraint system is established to perform low,medium,and high-intensity collisions.Simulate and compare the dynamics and biomechanical response of the head and neck when the main muscle force is activated at each intensity.The research results show that under low-intensity(40km/h)collisions,the muscle active force can reduce the maximum stress value of the cervical spine.In a medium-intensity(50km/h)collision,the muscle active force can not only reduce the maximum stress value of the cervical spine and intervertebral disc,but also can extrude the intervertebral disc by squeezing and apply a torque in the opposite direction to balance the stress concentrated on the vulnerable part of the cervical spine to The position where the front end has a higher intensity is more obvious under a medium-intensity collision.Under high-intensity collision(64km/h),the muscle active force is not obvious to reduce the maximum stress value,but it also has obvious effect to change the maximum stress concentration position.