The quantitative knowledge of the mechanical behavior of nanofibers is critical to quantify their performance in the target application.
Application Example: Tensile Testing of Nanofibers
For the quantitative mechanical analysis of nanofibers, uniaxial tensile testing is the most common technique. In this application the mechanical performance of two nanofiber types are compared in terms of tensile yield strengths and ultimate strengths. After fixing the nanofibers by Pt-EBID between the FT-S Microforce Sensing Probe and the sample holder, they are stretched until failure. From the resulting stress-versus-strain curve, the average yield/ultimate tensile strengths of the hybrid (bottom-up assembled nanocrystal) nanofiber, 357 MPa/706 MPa, and the gold nanofiber, 451 MPa/741 MPa, are calculated.
Application Example: Thermomechanical Creep Testing of Nanofibers
Metallic glasses are receiving growing attention due to their unique mechanical properties such as a large elastic limit and high fracture toughness. Furthermore, their large supercooled liquid region enables superplastic forming, opening up new material processing strategies. To facilitate this development, a quantitative understanding of its thermomechanical behavior is crucial. The depicted work investigates the superplastic-like flow of metallic glass. For this purpose, a metallic glass nanowire is attached between the FT-S Microforce Sensing Probe and the sample holder by Pt-EBID. While performing a creep test (apply a constant tensile load while measuring the deformation), the temperature is increased stepwise by passing an electric current through the nanowire. With this method, the creep behavior is analyzed at different nanowire temperatures.
|Nanomechanical Testing of Single Nanofibers (PDF)|