【摘要】 椭圆柱壳链可以引起波形弥散，从而可以调控应力波的传播.本文通过3D打印、冲击测试、细观有限元模拟和理论分析，研究了在质量块冲击加载下，单胞纵横比、冲击质量和速度对椭圆柱壳链中弹性波传播弥散行为的影响.结果表明，冲击过程中，椭圆柱壳链结构中的速度峰值随着波传播逐渐减小，纵横比越大或冲击质量越小，速度峰值衰减越剧烈，而冲击速度对椭圆柱壳链的波形弥散行为几乎无影响.相关研究对新型波形控制器的设计和精确有效地调控弹性波传播具有重要意义.更多还原

【Abstract】 Elliptical cylindrical shell chains have a fascinating characteristic: they can induce waveform dispersion, providing a means for manipulating stress wave propagation. This study explores the effects of three critical factors, namely unit cell aspect ratio, impact mass, and impact velocity, on the dispersion behavior of elastic wave propagation within the chain under mass impact. The relationship between these parameters and the dispersion of waveforms is established based on a multidisciplinary approach, combining 3D printing, impact testing, finite element simulations, and theoretical analysis. One of the key findings of this study is the gradual decrease in peak velocity and peak force within the elliptical cylindrical shell chain as the wave propagates during the impact process. This intriguing behavior holds immense promise for potential applications in controlling waveforms. The unit cell aspect ratio plays a pivotal role in influencing the waveform dispersion behavior. As the aspect ratio increases, the attenuation of the peak velocity becomes more pronounced. This indicates that the geometric configuration of the chain significantly impacts its wave manipulation capabilities. The impact mass exhibits a distinct influence on the dispersion behavior. A decrease in the impact mass results in more prominent attenuation of the peak velocity. Consequently, controlling the mass of the impacting object offers a viable strategy for regulating wave dispersion in the chain. Surprisingly, the impact velocity has minimal effect on the waveform dispersion behavior, as evidenced by the numerical results. Based on the wave propagation model considering transverse inertia, the influence laws of these parameters on the wave propagation behavior in the chain structure are analyzed, and the obtained results are consistent with the finite element simulation results. The comprehensive research presented here sheds valuable light on the wave propagation behavior of elliptical cylindrical shell chains under mass impact. The insights gained pave the way for the design of novel wave controllers and accurate and effective regulation of elastic wave propagation.更多还原