纳米流控能量吸收耗散系统

发布时间：2018-07-24 14:35

【摘要】：基于纳米流控行为设计的新一代能量吸收耗散系统(nanofluidic energy absorption system,NEAS)将会比传统吸能材料具有更高的能量吸收密度,而且还可以重复使用,特别是在小体积应用环境下具有显著的优势.本文从实验和计算模拟两方面综述了目前关于NEAS能量吸收耗散行为的最新研究进展,其中实验研究主要包括准静态压缩和动态压缩测试,计算模拟研究主要是采用基于经验势的分子动力学模拟方法.通过准静态压缩实验,可以测量NEAS模型的载荷-位移关系曲线,从而获得NEAS模型的临界渗透压强,了解卸载后系统是否能够恢复到加载前的状态(即是否可以重复使用),并通过载荷-位移关系曲线下面积估算NEAS模型的吸能密度;通过动态压缩实验可以测量NEAS模型对脉冲载荷的缓冲保护作用,主要体现为降低脉冲载荷幅值和扩展脉冲宽度.计算模型研究可以明确给出NEAS对外载荷的微观响应,从而可以准确了解NEAS的能量吸收耗散机制以及吸能密度的主要影响因素.本研究可以帮助我们全面了解NEAS的研究进展,为NEAS的设计与优化提供重要指导.
[Abstract]:The new generation energy absorption and dissipation system (nanofluidic energy absorption / NEAS) based on nano-fluidic behavior design will have higher energy absorption density than the traditional energy absorption materials, and can be reused, especially in the small volume application environment. In this paper, the latest research progress on the energy absorption and dissipation behavior of NEAS is reviewed in terms of both experimental and computational simulation. The experimental research mainly includes quasi-static compression and dynamic compression testing. The method of molecular dynamics simulation based on empirical potential is mainly used in computer simulation. The load-displacement curve of NEAS model can be measured by quasi-static compression experiment, and the critical osmotic pressure of NEAS model can be obtained. To understand whether the system can be restored to the state before loading (that is, whether it can be reused) after unloading, and to estimate the energy absorption density of NEAS model by the area under the load-displacement relation curve; The buffering and protecting effect of NEAS model on pulse load can be measured by dynamic compression experiment, which is mainly reflected in reducing the amplitude of pulse load and extending pulse width. The microscopic response of the external load of NEAS can be clearly obtained by studying the computational model, thus the energy absorption and dissipation mechanism of NEAS and the main influencing factors of the energy absorption density can be accurately understood. This study can help us to understand the research progress of NEAS and provide important guidance for the design and optimization of NEAS.
【作者单位】： HEDPS 北京大学应用物理中心北京大学工学院;
【分类号】：TB383.1

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