SrAl₂O₄: (Eu, Dy, Nd) 압광체를 이용한 균열 전파 및 브리징 응력의 가시화 연구 = Visualization of Crack Propagation and Bridging Stress using the Mechano-luminescence of SrAl₂O₄:Eu,Dy,Nd

다국어 초록 (Multilingual Abstract)

The goal of the present investigation was to visualize the propagating crack in a mechano-luminescence (ML) material to enable the measurement of instantaneous R-curves and directly observe the bridging (shielding) stress in a fast-propagating crack system. The well-known ML compound, SrAl₂O₄: Eu^(2+), was used as a model test material. Two additional trivalent rare earth elements, Dy and Nd, were introduced as co-dopants to improve the luminescent efficiency. The initiation and growth of a crack from the mechanically machined sharp notch tip in a disc shaped compact tension (CT) specimen at a relatively high loading rate were found to be associated with the extent of light emission around the crack. An in-situ measurement of crack length and applied load for 0.3 sec yielded an instantaneous R-curve at the conventional crack propagation speed.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 실험방법
• 3. 결과 및 고찰
• 4. 결론
• 후기
• REFERENCES