Testing Mechanical Behavior At The Nanoscale Using Isolated Nanostructures

使用孤立的纳米结构在纳米尺度上测试机械行为。Picu，机械，航空航天和核工程系，G.- C. Wang和T.- M.我们提出了一个纳米尺度的元素（铜和钨）样品的力学性能的实验研究。我们将使用一个新的家庭的倾斜角沉积技术生长的纳米结构，已被专门设计为测试样本。纳米结构是以孤立的纳米棒、纳米梁和纳米弹簧的形式，其一端固定到刚性基底。它们将用原子力显微镜（AFM）或纳米压痕仪的尖端进行测试。样品设计用于重现标准宏观测试，其中明确定义的材料体积加载有已知的应力状态。我们将调查：材料性质（模量、屈服应力）和行为（例如硬化）与试样尺寸的比例关系、固溶体硬化是否可用于调整纳米结构中的机械性质以及疲劳行为。该提案有一个结构良好的教育部分，将在MEMS和NEMS领域产生更广泛的影响。

Testing Mechanical Behavior at the Nanoscale Using Isolated NanostructuresR.C. Picu, Department of Mechanical, Aerospace and Nuclear Engineering,G.-C. Wang and T.-M. Lu, Department of Physics, Applied Physics and Astronomy.We propose an experimental study of the mechanical properties of elemental (Cu and W) specimens with nanoscale dimensions. We will use a new family of nanostructures grown by the oblique angle deposition technique that have been specially designed as test specimens. The nanostructures are in the form of isolated nanorods, nanobeams and nanosprings that are fixed at one end to a rigid substrate. They will be tested with the tip of an atomic force microscope (AFM) or a nanoindenter. The samples are designed to reproduce standard macroscopic tests in which a well-defined volume of material is loaded with a known stress state. We will investigate: the scaling of material properties (moduli, yield stress) and behavior (e.g. hardening) with the specimen size, whether solid solution hardening may be used to tailor mechanical properties in nanostructures, and the fatigue behavior. The proposal has a well-structured educational component and will have a broader impact in the field of MEMS and NEMS.