| As the vehicle capacity and the freeway mileage increase, the number of traffic accidents is also growing in recent years, and one third of the accidents are caused by vehicles crash the guardrail. Crashworthiness performance of the present guardrail is declining since the vehicle becomes miniaturization, large-scale or heavy. It causes huge casualties and heavy property damages every year. Therefore, it has a great significance to do researches on crash mechanism between vehicle and the guardrail, design new guardrail to improve the crashworthiness.In the paper, crash between vehicle and the guardrail, performance of the guardrail crashworthiness are studied through computer simulation method. First, guardrail crashworthiness tests and security evaluation criteriaion at home and abroad are analysed and compared, test scheme and evaluating indicators of a new guardrail is established. Then, crash mechanalism is analysed and the crash simulation model is created. According to the crash simulation model and test method of uniform design, a new guardrail which called double-bar semi-rigid guardrail and its structural parameters is identified. Finally, finite element models and vehicle-guardrail system is created through HyperMesh, and calculated by LS-DYNA. After studying the dynamic response of vehicle and the guardrail, crashworthiness of the two guardrails are analysed and compared, max displacement of the guardrail, vehicle max acceleration, driving out angle and such kinds of evaluating indicators verify that new guardrail has excellent crashworthiness performance.For the evaluation of passenger's head injury, the research results of this paper possess a definite reference value for guardrail crash safety standards of our country, also provide theoretical basis of double semi-rigid guardrail and derivative structure of waveform guardrail for further research and application, has an important engineering practical value. |
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