PDF(Pubmed)
Abstract：
Thin-walled structures are commonly used as energy absorbers in motor vehicles. Their function is to protect the structural components of vehicles and to absorb energy completely during collisions up to 20 km/h. This paper focuses on maintaining crush axiality during research. To verify the numerical analyses, physical specimens were made and then subjected to dynamic crushing. Force and shortening values as well as high-speed camera images were used for data analysis. Through time-lapse shots, plastic deformation within the crush initiator was observed. Such detailed analysis allowed the determination of the influence of hexagonal triggers in the form of notches on the post-buckling progressive analysis. In this paper, neural networks were used to examine the importance of each variable. Data from numerical analyses were used for this purpose. Based on the analyses performed, the effects of both the width and height of the triggers on the crush load efficiency (CLE) and total efficiency (TE) ratios can be seen. The width of the crush initiator has the greatest influence on Crash-box performance. Nevertheless, increasing both the height and the width of the initiator can result in crush non-axiality and underperformance of the energy absorber.
摘要：
薄壁结构通常用作机动车辆中的能量吸收器。它们的功能是保护车辆的结构部件，并在高达20km/h的碰撞过程中完全吸收能量。本文着重于在研究过程中保持挤压轴向性。要验证数值分析，制作物理标本，然后进行动态粉碎。使用力和缩短值以及高速相机图像进行数据分析。通过延时拍摄，观察到压碎引发剂内的塑性变形。这样的详细分析可以确定凹口形式的六边形触发器对屈曲后渐进分析的影响。在本文中,使用神经网络检查每个变量的重要性.来自数值分析的数据用于此目的。根据所进行的分析，可以看到触发器的宽度和高度对压碎载荷效率（CLE）和总效率（TE）比率的影响。破碎引发器的宽度对破碎箱性能的影响最大。然而，同时增加引发器的高度和宽度会导致能量吸收器的挤压非轴向性和性能欠佳。
