Research On Passive Safety Of Automotive Frontal Collision Simulation

Since Karl Benz invented cars in1986, cars have been playing an important role in the development of human being. Due to the improvement of living standard, the number of cars on the street is increasing. The car market of China has been growing constantly along with the economic growth. In2011, China became the biggest auto market in the world with over18millions of cars being made and sold. Due to the growth of the number of cars, traffic accidents have been happening more and more, threatening the safety of people and property. So, it’s necessary to study the passive safety of the cars when a crash happens. Based on some data, front crash(including offset crash) is about40%percent of total number of traffic accidents. This paper is about the stimulation of front crash and40%offset crash, which is helpful to be used to improve cars.This paper uses one SUV model to stimulate crash. Pre process software is Hypermesh, whose jobs are mainly testing the FEA models, meshing, setting up materials and property, applying load and defining the contact, etc. The computing software is LS-DYNA, whose job is calculating the finished FEA model and having d3plot files to be analyzed afterwards. Post process software are LS-PREPOST and Hyperview, whose jobs are testing if the results are right and analyzing the d3plot files to assess the passive safety of the car.Through the testing and analyzing of the results, we knew that stimulation is successful and matches with true crash situations. During the front crash of the rigid wall, the front part of the car warped very well, which absorbed a lot of energy,so that the impact on the passengers compartment is less. The transformation of the firewall and the body is not evident, which assures the safety of the passengers in the car. During the40%offset crash, due to the higher speed and smaller crash area, the left side of the body transformed more severely than the front crash, while the right side of the body barely transformed. Similarly, the front part of the body warped very well and absorbed a lot of energy. To sum up, the stimulation of front crash and offset crash is effective and matches with the true situations, so the result can be used to improve the passive safety of cars.