公路防撞护栏新材料及碰撞仿真

发布时间：2018-01-13 11:30

本文关键词：公路防撞护栏新材料及碰撞仿真　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文从交通基础设施服务于交通安全角度出发,通过分析国内外公路护栏的现状,得知新材料公路护栏在我国乃至世界上均有着较好的发展前景。文章分析了各新型材料的的优缺点,特别针对超高分子量聚乙烯进行了详细的研究,并在与其他材料的公路护栏对比中,发现超高分子量聚乙烯有着其特有的优势。其材料性能优异且特点突出,且工艺发展有一定的规模,具有良好的应用前景。超高分子量聚乙烯材料性能十分优异,但其在公路护栏领域的应用仍然具有一定局限性,主要表现在其加工难度大,难以实现高效率、低成本加工；其材料性质能否真正满足公路护撞护栏产品的需要；实车碰撞等传统验证方法有费用高等缺陷。采用计算机仿真模拟的方法能有效地解决其验证的难题,并且可以模拟不同车型,不同冲撞初始条件的碰撞全过程,并能提供实验无法观察到的碰撞过程细节。本文依据《高速公路护栏安全性能评价标准》等公路交通安全设施标准,从实车碰撞的角度出发,制订出碰撞方案。并采用通过UG NX、HyperWorks、 LS-DYNA等软件对车辆护栏模型进行了模拟仿真,得出仿真结果。通过仿真结果分析,得出了单纯的超高分量聚乙烯运用于公路护栏不可行、需要进一步增强物理性能的结论,并且通过进一步研究找出了材料改性的方向,为新材料用于公路防撞护栏产品提供了理论基础。
[Abstract]:From the point of view of traffic infrastructure serving traffic safety, this paper analyzes the current situation of highway guardrail at home and abroad. It is known that the new material highway guardrail has a good development prospect in China and even the world. This paper analyzes the advantages and disadvantages of each new material, especially for ultra high molecular weight polyethylene (UHMWPE). Compared with other materials, UHMWPE has its unique advantages, excellent properties and outstanding characteristics, and the process development has a certain scale. UHMWPE material has excellent performance, but its application in the field of highway guardrail still has some limitations, mainly because of its processing difficulty, difficult to achieve high efficiency. Low cost processing; Whether the material properties can really meet the needs of highway protection and impact barrier products; The traditional verification methods such as real vehicle collision have high cost and so on. The method of computer simulation can effectively solve the problem of verification, and can simulate the whole process of collision with different vehicle types and different initial conditions of collision. And it can provide the details of the collision process that can not be observed in the experiment. According to the highway traffic safety equipment standards such as the evaluation standard of highway guardrail safety performance, this paper starts from the point of view of real vehicle collision. The collision scheme is worked out, and the vehicle guardrail model is simulated by UG NXL HyperWorks, LS-DYNA and so on. Through the analysis of simulation results, it is concluded that it is not feasible to use UHMWPE in highway guardrail, and the physical properties need to be further enhanced. Through further research, the direction of material modification is found out, which provides a theoretical basis for the new material to be used in highway anti-collision barrier products.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U417.12

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