Zheng Yonggang, Ding Liquan, Ye Hongfei, Chen Zhen
International Research Center for Computational Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, 116024, People's Republic of China.
Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO, 65211, USA.
Nanoscale Res Lett. 2017 Dec;12(1):308. doi: 10.1186/s11671-017-2085-x. Epub 2017 Apr 26.
Tuning material properties in the 3-D printing process of metallic parts is a challenging task of current interests. Much research has been conducted to understand the effects of controlling parameters such as the particle geometry (size and shape), heating, and cooling ways on the outcome of the printing process. However, nothing has been done to explore the system vibration effect. This letter reports our findings on the vibration-induced property change in the melting and solidifying process of silver nanoparticles with the use of molecular dynamics simulation. We find that the increase of system vibration magnitude would increase the number fraction of disordered atoms, which in turn changes the nanostructure of solidified products. For a given system vibration magnitude, the number fraction of disordered atoms reaches the maximum around the system natural frequency so that the stiffness of solidified products becomes the minimum. Since this trend is not affected by the system size, the above findings reveal a feasible path toward the real-time tuning of material properties for advancing additive manufacturing.
在金属零件的3D打印过程中调整材料属性是当前备受关注的一项具有挑战性的任务。已经开展了大量研究来了解诸如颗粒几何形状（尺寸和形状）、加热和冷却方式等控制参数对打印过程结果的影响。然而，尚未有人探索系统振动效应。这封信报告了我们利用分子动力学模拟在银纳米颗粒熔化和凝固过程中关于振动诱导属性变化的研究结果。我们发现系统振动幅度的增加会增加无序原子的数量分数，进而改变凝固产物的纳米结构。对于给定的系统振动幅度，无序原子的数量分数在系统固有频率附近达到最大值，从而使凝固产物的刚度变为最小值。由于这种趋势不受系统尺寸的影响，上述研究结果揭示了一条通过实时调整材料属性来推进增材制造的可行途径。
