A Novel Technique for Viewing Stress Distribution with Mechanoluminescence Materials

Abstract

We have successfully demonstrated that the stress distribution of a metal substrate can be directly displayed by coating SrAl2O4:Eu (SAO), a representative of strong mechanoluminescent materials, on the surface of test objects. An aluminum plate with SAO sensing film had been applied to experimental analysis of stress concentrations, and a numerical calculation via a finite element method confirmed that the observed real time mechanoluminescence images displayed the stress distribution. As a result, visualization of stress distribution on metal surface has been realized by ML images using SAO sensing film, and this novel visualization technique can be applied for viewing the stress concentration in various fields such as modeling, manufacturing and demonstration of an industrial product.

Enhanced luminescence performance of Sr2MgSi2O7:Eu2+ blue long persistence phosphor by co-doping with Ce3+ ions

“…ions as PL and TL, which is also produced by the transition of Eu 2? ions between the excited states (4f 6 5d 1 ) to ground state (4f 7 ) is responsible for the blue ML emission [51].…”

Luminescence induced by elastic deformation of ZnS:Mn nanoparticles

“…In recent years the investigation of mechanoluminescent materials exhibiting intense ML during their elastic deformation and fracture has attracted the attention of a large number of workers and some important applications of ML materials have been made. Rare earth doped strontium aluminates phosphors have been found useful in the real-time visualization of stress distribution in solids [2][3][4][5] and also in the visualization of stress-distribution near the tip of a crack [6,7]. The ML of SrAl 2 O 4 : Eu, Dy phosphors has been found to be suitable for the real-time visualization of quasidynamic crack-propagation in solids [8][9][10][11].…”

Strong mechanoluminescence induced by elastic deformation of rare-earth-doped strontium aluminate phosphors

“…This has attracted great attentions and significant interests of scientists, engineers and technologists for the use of ML materials as new stress-sensing technologies. Rare-earth-doped strontium aluminate phosphors have been found useful in the real-time visualization of stress distribution in solids [4][5][6][7] and also in the visualization of stress distribution near the tip of cracks [8,9]. The ML of this phosphor has been found to be suitable for the visualization of quasidynamic crack propagation in solids [10][11][12][13].…”