Simulation Of Frontal Offset Automobile Crash

In the rapid development trends of automotive technology, vehicle safety research is receiving increasing attention. Crash manufacturers of the world already have mandatory statement rules for crash safety, e.g. USA.FMVSS.EU ECE. IN our country, the appropriate safety regulations has been set up mainly according to ECE rules system.Compared the foreign frontal impact rules, these are mainly 100% rigid wall barrier impact,40% offset rigid or deformable barrier and 30°angular impact test. Among these test rules,100% rigid wall Barrier impact test stressed assessment of occupant restraint system, 40% offset deformable barrier stressed assessment car body safety. And the injure characteristics in the two type are different. Only using the two type test could over all assess frontal impact safety. Over the past 20 years, the passive safety of motor vehicles in the collision simulation technology rapidly developed. Not only does cost savings but also shorten the development cycle, in the development process in the car played a great role. Vehicles crash simulation including front row dummy can accurately forecast not only the crash characteristic of vehicles but also response and injury degree of passengers in crash process. So the car safety performance could be more fully reflected.The thesis detailedly state the finite element method theories and algorithms of impact .It includes basic crash equating, element discretization, hour glass control, relative element of the dummy and car crash simulation, time integration algorithms, contact-impact algorithms, material model and property.This paper has analyzed main function module and the solving principle that relevant the great displacement crash theory of LS-DYNA, which is the comparative popular automobile crash software in the world at present. This paper take a car as an example. The complete finite element models of a passenger car and the occupant restraint system including a 50th percentile HybridⅢdummy (driver and passenger) and the seatbelt subsystem were presented. According to The protection of the occupants in the event of an off-set frontal collision for passenger car, the 40%-offset DB frontal crash test of the car at 56 km/h was successfully simulated and the results include the car's displacement, velocity, acceleration with crash process and performance。In order to more fully evaluate the positive safety performance, this paper proceed the entire width of the rigid collision simulation at the same time and compare the two methods of deformation results and analysis of the characteristics of two ways collision. To achieve a positive impact on the car during the collision and full evaluation of the performance.