In-situ observation of nonuniform deformation during tensile test of aluminum alloy sheet by means of screen-printed mechanoluminescence film

Nonuniform deformation in a tensile test of an aluminum alloy sheet was visualized by a coating of ∼ 5 μm thick mechanoluminescence (ML) material film (SrAl2O4:Eu2+) on the specimen. It is reported that ML material emits visible light under mechanical stress, and that the intensity increases with von Mises stress. Fine sized ML particles were used to form thin film on the specimen with a screen-printing technique. During the tensile test of...