Generalization of the quantitative stress-intensity relationship of mechanoluminescent sensor SrAl2O4:Eu2+,Dy3+ in elastic domain

The quantitative relationship between stress and ML intensity ratio in elastic domain was established in SrAl2O4:Eu2+, Dy3+ (SAOED) resin samples. The stress on the resin sample (macro stress) was directly measured and the stress on the SAOED (micro stress) was calculated by Eshelby method. The macro and micro stresses keep a linear relationship, and the ML intensity ratio is proportion to stress. Eventhough the relationship between macro stress and ML intensity ratio is dependent on SAOED concentration and elastic modulus of matrix, a universial relationship exists between the micro stress and ML. Based on this results, a generalized equation which could describe the relationship between the stress, ML intensity and ML sensor matrix was established, which can then be applied in situations of different SAOED concentrations or even different matrix materials. This generalized relationship could provide guidance for the development and application of SAOED based ML sensors.