In this research, the mechanical behavior of aluminum nanofoam was studied by the method of molecular dynamics simulation. The effective parameters in mechanical properties such as porosity, pore size, temperature, and strain-rate were investigated. The results showed that Young’s modulus, yield strength, and ultimate tensile strength were increased by decreasing the porosity and pore size. To accurately calculate the Young’s modulus (Es), the yield strength (σYS) and the ultimate tensile strength, combining the stress–strain curves with the potential and kinetic energy-strain curves was suggested as a standard method. The investigations about the effects of temperature and strain-rate on the tensile behavior showed that increasing temperature cause decrease in Es, σYS, and σUTS of foams. Moreover, the σUTS increased significantly while the Es and the σYS of the samples exhibited minor change with an increase in strain-rate. Nanofoam failure also occurred by stress localization, nucleation, and growth of cracks on the surface of pores.

中文翻译：

---

纳米泡沫铝单晶力学性能研究：分子动力学模拟方法

本研究采用分子动力学模拟方法研究铝纳米泡沫的力学行为。研究了力学性能的有效参数，如孔隙率、孔径、温度和应变速率。结果表明，杨氏模量、屈服强度和极限拉伸强度随着孔隙率和孔径的减小而增加。为了准确计算杨氏模量 (Es)、屈服强度 (σYS) 和极限抗拉强度，建议将应力-应变曲线与势能和动能-应变曲线相结合作为标准方法。关于温度和应变速率对拉伸行为影响的研究表明，升高温度会导致泡沫的 Es、σYS 和 σUTS 降低。而且，随着应变速率的增加，σUTS 显着增加，而样品的 Es 和 σYS 表现出微小的变化。Nanofoam 失效也发生在应力局部化、成核和孔隙表面裂纹的生长。