On the determination and optimization of apparent “elastic limit” of kirigami metallic glasses

Abstract

Kirigami metallic glasses (MGs), with super elasticity and ultra-small energy loss, have great application potential for stretchable devices. However, how to determine the elasticity of kirigami MGs is still challenging, and the design of stretchable kirigami MGs is also limited to experimental tests. In this work, based on an FEM route, the apparent “elastic limit” of kirigami MGs was determined and compared with previous experimental findings. Thereafter, based on the FEM route, the effect of geometrical parameters of kirigami patterns, such as notch-cut-width, secondary node-cut, path length and notch-cut shape, on the apparent “elastic limit” of kirigami MGs has been examined. The geometrical parameters were optimized to obtain better elastic performance, where the largest apparent “elastic limit” of 709% was achieved. The present findings are of significance for determining and optimizing the apparent “elastic limit” of kirigami MGs, and designing of kirigami MG devices for practical applications.