A New Testing Methodology for Determination of Elastic-Plastic Properties of Thin Metallic Wires

摘要

In this study a new testing methodology with a setup to determine the mechanical properties nanowires based on bending under lateral load is reported. In the setup a force sensor, a piezo stage and two nano-manipulators have been accommodated on a single platform. A small-span bending load using two opposite probes is applied far from the root of the wire to ensure the failure in the wire across the loading point, and the load-displacement data are recorded. For evaluating the properties from the measured load-displacement relationship, finite element (FE) analysis of the bending problem under the same loading configuration has been performed. The elastic-plastic properties of 800 nm platinum (Pt) sample, especially, Young's modulus, yield strength and hardening modulus are successfully determined by fitting the load-displacement relationship obtained in FE analysis to the experimental one.