Dynamic visualization of stress distribution by mechanoluminescence image

We report the realization of the dynamic image of stress distribution by de veloping a remarkably strong mechanoluminescence (ML) material of Sr0.975Al 2O3.985:Eu-0.01, which can emit four orders of magnitude larger intensity t han that of the reported strong ML material of quartz crystal. This ML mate rial can be mixed in the target composite or coated on the surface to sense stress by emitting visible light. This method is applicable to the dynamic visualization of stress distribution in a solid not only in the atmosphere but also in an aqueous environment. (C) 2000 American Institute of Physics . [S0003-6951(00)02602-4].