Rogala Michał, Gajewski Jakub, Górecki Marcin
Department of Machine Design and Mechatronics, Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland.
Faculty of Civil Engineering and Architecture, Lublin University of Technology, 20-618 Lublin, Poland.
Materials (Basel). 2021 Oct 11;14(20):5981. doi: 10.3390/ma14205981.
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.
薄壁结构通常用作机动车的能量吸收装置。其功能是保护车辆的结构部件，并在高达20公里/小时的碰撞过程中完全吸收能量。本文在研究过程中着重于保持挤压轴向性。为了验证数值分析，制作了物理试样，然后对其进行动态挤压。力和缩短值以及高速摄像机图像用于数据分析。通过延时拍摄，观察到挤压引发器内的塑性变形。这种详细分析使得能够确定缺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，使用神经网络来检验每个变量的重要性。为此使用了数值分析的数据。基于所进行的分析，可以看出触发器的宽度和高度对挤压载荷效率（CLE）和总效率（TE）比率的影响。挤压引发器的宽度对碰撞盒性能影响最大。然而，增加引发器的高度和宽度都可能导致挤压非轴向性以及能量吸收装置性能不佳。
