Mao Shunyuan, Wang Hui, Wu Xiaomao, Zhang Huiling
School of Physical and Mathematical Sciences, Nanjing Tech University, Nanjing 211816, China.
Materials (Basel). 2023 Feb 2;16(3):1282. doi: 10.3390/ma16031282.
Considering the elastic-plastic deformation, the wave propagations and energy transmissions of the one-dimensional three-segment composite granular chain are studied. The axial symmetry model for elastic-perfectly plastic materials is built by using the finite element method. Six materials with different yield strengths are selected for the adjustable segment. The results show that the repeated loading and unloading behaviors, as well as the wave propagations in the elastic-plastic granular chain, are complex and significantly different from those in the purely elastic granular chain. The yield strength of the granular materials in the adjustable segment has significant effects on energy dissipation and wave velocity, which could be used to design the impact buffer. The studies show that taking lower yield strength for the adjustable part than the non-adjustable part, the energy dissipation could be increased, and the wave velocity could be reduced, then the arrival time of the impact waves could be delayed. These characteristics of the elastic-plastic granular chain could be used to design metamaterials for impact absorbers in impact protection.
考虑弹塑性变形，研究了一维三段复合颗粒链的波传播和能量传输。采用有限元方法建立了理想弹塑性材料的轴对称模型。为可调段选择了六种具有不同屈服强度的材料。结果表明，弹塑性颗粒链中的反复加载和卸载行为以及波传播与纯弹性颗粒链中的行为复杂且显著不同。可调段中颗粒材料的屈服强度对能量耗散和波速有显著影响，可用于设计冲击缓冲器。研究表明，使可调部分的屈服强度低于不可调部分，可增加能量耗散、降低波速，进而延迟冲击波的到达时间。弹塑性颗粒链的这些特性可用于设计用于冲击防护中冲击吸收器的超材料。
