FLEXIBLE-ELASTIC DEFORMATION MEASUREMENT OF ZnS:Cu2+ MECHANOLUMINESCENT FILM USING VISUAL INSPECTION AND DIGITAL IMAGE CORRELATION. - Guo-Qing Gu; Gui-Zhong Xu; Feng Shen; Peng Zhou; Hou-Chao Sun; Jia-Xing Weng (Metrology & Measurement Systems, 2023)