Equivalent Energy Absorption (EEA) - A Methodology for Improved Automotive Crash & Safety Design

Peddi Sai Rama Narayana, R. Prakash, S. Gunti, Kanugula Raghu
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引用次数: 1

Abstract

Safety norms across the world are becoming more and more stringent posing new challenges to achieve lightweight vehicle structures. Structures made of Advanced/Ultra high strength steels (AHSS) play a vital role in meeting the vehicle safety targets, by absorbing large amounts of impact energy, as well as by withstanding higher impact loads that occur due to vehicle collisions. Safety simulations usually take longer solution times due to their complexity and nonlinear nature. Engineers often encounter with a problem of quick evaluation of safety performance by using different grades of materials to optimize the weight & cost. In this paper, a new methodology - Equivalent Energy Absorption (EEA) has been proposed to do a quick trade-off study on performance vs weight for various thickness and material combinations. A relationship is established between the gauge and grade of a component to derive an equivalent safety performance so that engineers can make quick decisions by conducting minimal number of simulations. a simple rectangular crush box was considered for study to assess the Energy Absorption (EA) with various material and thickness combinations. A Design of Experiments (DOE) study was done using simulations with many numbers of material grades and gauges to construct a 3D Response Surface between gauge, grade & EA parameters to understand the relationship between each of these parameters. A case study has been discussed in the paper about application of this methodology on a vehicle to evaluate its safety performance. It has been found that more than 80% evaluation time is reduced by using this methodology.
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等效能量吸收(EEA)——一种改进汽车碰撞与安全设计的方法
世界各国的安全标准越来越严格,为实现汽车结构的轻量化提出了新的挑战。由先进/超高强度钢(AHSS)制成的结构通过吸收大量的冲击能量,以及承受由于车辆碰撞而产生的更高的冲击载荷,在满足车辆安全目标方面发挥着至关重要的作用。安全仿真由于其复杂性和非线性特性,通常需要较长的求解时间。工程师经常遇到的问题是,如何通过使用不同等级的材料来优化重量和成本来快速评估安全性能。在本文中,提出了一种新的方法-等效能量吸收(EEA),用于快速权衡各种厚度和材料组合的性能与重量。建立了元件的规格和等级之间的关系,以获得等效的安全性能,以便工程师可以通过进行最少数量的模拟来快速做出决策。以一个简单的矩形挤压箱为研究对象,研究了不同材料和厚度组合的吸能性能。实验设计(DOE)研究使用大量材料等级和量具进行模拟,构建量具、等级和EA参数之间的3D响应面,以了解这些参数之间的关系。本文以某汽车为例,讨论了该方法在汽车安全性能评价中的应用。研究发现,使用该方法可减少80%以上的评估时间。
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