Development of a small fatigue testing machine using a Piezoelectric actuator and check the fatigue property of Ni based metallic glass

Abstract

We developed a small fatigue testing machine using a Piezoelectric actuator. The fatigue testing machine was designed on the concept of micro-factory. Fatigue tests have been carried out on high strength Ni-based metallic glass. The fatigue strength of the material is about 350MPa, and this strength is 13% of the tensile strength of 2.7GPa. Fracture has been occurred for a moment due to the glassy structure after the crack propagation initiated at the inside of a specimen. Striation due to the crack propagation during the reated cycles has been observed and the vein pattern has been recognized at the fractured surface.