【摘要】 具有高效吸能特性的薄壁结构已被广泛应用于各种运载工具中,但传统单壁结构存在易陷入全局弯曲的不稳定吸能模式。因此,提出一种窗型多壁结构,并采用试验测试、仿真分析与理论预测相结合的方法,详细研究了窗型多壁结构、均匀方形多胞结构与方形三壁结构在轴向载荷作用下的吸能特性。研究结果表明:窗型多壁结构比同质量的另外两种结构具有更高的吸能效率。同时,窗型多壁结构的几何参数(壁厚T、内层壁边长D,壁间距比N)对结构的耐撞性能有显著影响。并且,基于超折叠单元理论开发了窗型多壁结构的理论模型,该模型能较好的预测窗型多壁结构的平均碰撞力与吸能特性,并采用数值分析结果与理论预测结果的对比来验证了理论预测模型的可靠性。研究结果对开发新颖的轻量化薄壁吸能结构提供了良好的指导与理论支撑。更多还原

【Abstract】 Thin-walled structures have been widely used in various delivery vehicles due to high energy absorption performance, but single-wall structures easily suffer global bending and cause unstable energy absorption mode. Therefore, a window multi-wall structure is proposed to improve the energy absorption of single wall structures. The energy absorption characteristics of the window multi-wall structure, uniform multi-cell square structure and square three-wall structure are detail investigated under axial loading by experimental testing, simulation analysis and theoretical prediction. The results show that the window multi-wall structure has higher energy absorption efficiency than other two structures of the same mass. At the same time, the geometric parameters, such as wall thickness T, inner wall side length D and wall spacing ratio N, have a significant effect on crashworthiness of the window multi-wall structure. Furthermore, a theoretical model of the window multi-wall structure is developed to predict the mean crushing force and energy absorption of the window multi-wall structure based on super folding element theory. The reliability of the theoretical model is validated by comparing numerical results with theoretical solutions. The research findings offer a good guidance and theoretical support for development a novel thin-walled energy absorption structures.更多还原