Simulation Analysis Of Crashworthiness For Anti-collision Guardrail

In recent years, it is occasionally happened that terrorists attack the important government departments and crowed places by driving vehicles. The number of traffic accidents increases year by year, in which the accidents caused by vehicle colliding with guardrail directly and indirectly are more serious. In order to avoid this incidents, a new kind of anti-terrorism explosion guardrail is badly needed. This kind of guardrail is installed in the important government departments and crowed places, which can intercept the collision attempted vehicles, and reduce the damage to passengers in vehicles due to misoperation. In addition, a certain of beauty appearance is also necessary to avoid the oppression sense of observers.Based on the project of the Crash worthiness simulation of guardrail from one company, this paper aims at the analysis of the crash worthiness of the guardrail and its structure improvement. The main contents include as follows:1. The types, advantages and disadvantages of every kind of current existed guardrails are introduced in detail. The simplified 3D solid models of TAMHL120 guardrail are created. The innovation and principle of the guardrail are detailedly analyzed.2. High quality grids of vehicles and guardrails and their material properties definition are conducted in HYPERMESH. The finite element models of vehicles, guardrails and their different collision conditions are constructed, during which, the finite element models of vehicles and guardrails are properly simplified. Besides, the element algorithm, material model, the contact interface definition and other key problems are illustrated in detail. The finite element model of vehicle-guardrail collision is verified.3. The vehicles collide with guardrails in different velocities from different angles are simulated, during which, the displacement, velocity, acceleration and related data of vehicles are obtained. The stress-strain, energy absorption law, the effect of wire rope and other performance during collision are detailed analyzed that the weak position of guardrail is obtained. According to the GB11551-2003 standard, performance of the guardrail is evaluated, which laid the foundation for the guardrail structure improvement.4. the guardrail structure is improved in different aspect based on previous simulation results. The comparison between original scheme and improved scheme is conducted, which shows the improved guardrail can reduce the stress in weak position of the guardrail on a large scale and meet the performance of protect passengers in vehicle when colliding. In this way, the guardrail can not only ensure anti-terrorism requirements, but also avoid the harm to passengers due to improper operation.5. the main contents of this paper are summarized, and the shortages are illustrated.