Browse > Article
http://dx.doi.org/10.5228/KSPP.2003.12.5.493

Direct Observation of Crack Tip Stress Field Using the Mechanoluminescence of SrAl2O4:(Eu,Dy,Nd)  

김지식 (상주대학교 신소재공학과)
손기선 (순천대학교 재료금속공학과)
Publication Information
Transactions of Materials Processing / v.12, no.5, 2003 , pp. 493-497 More about this Journal
Abstract
The present investigation aims at visualizing the crack tip stress field using a mechanoluminescence material. The well known compound $SrAl_2O_4$:$Eu^{2+}$ was adopted as a mechanolurninescence material. Two more trivalent rare-earth elements such as Dy and Nd were taken into consideration as codopants to provide the appropriate trap levels. Samples of a variety of compositions were prepared by varing $Eu^{2+}$, $Dy^{3+}$, and $Nd^{3+}$ doping contents, for which the combinatorial chemistry method was used. In order to search for the optimum composition for the highest mechanoluminescence, the luminescence induced by a compressive device including a CCD camera. In parallel, a compact tension specimen was prepared by mixing the luminescence powders of optimum composition and epoxy resin. Crack initiation from the mechanically machined sharp note tip and its growth during loading were found to be associated with the extent of light emission from $SrAl_2O_4$.
Keywords
Crack Tip Stress Field; Mechanoluminescence; Combinatorial Chemistry Method; $SrAl_2O_4$:$Eu^{2+}$;
Citations & Related Records
연도 인용수 순위
  • Reference
1 K. S. Sohn, S. Lee, and S. Baik, 1995 "Analytical Modeling for Bridging Stress Function Involving Grain Size Distribution in a Polycrystalline Aluminas", J. Am. Ceram. Soc., 78, pp. 1401-1405.   DOI   ScienceOn
2 C.-N. Xu, X. G. Zheng, M. Akiyama, K. Nonaka, T. Watanabe. 2000 "Dynamic Visualization of Stress Distribution by Mehanoluminescence Image" Appl. Phys, Lett., 76, No. 2, pp, 179-181.   DOI   ScienceOn
3 M. Akiyama, C.-N. Xu, H. Matsui, K. Nonaka, and T. Watanabe, 1999 "Recovery Phenomenon of Mechano luminescence from Ca2A12SiO7:Ce by Irradiation with Ultraviolet Light", Appl. Phys. Lett., 75 77, No. 17, pp. 2548-2550.
4 K. S. Sohn, S. Lee, S. Baik, 1997 "Effect of Bridging Stress on DCB Analysis of Polycrystalline Aluminas", Acta Mater., 45, pp. 3445-3457.   DOI   ScienceOn
5 D. Broek, 1986 “Elementary Engineering Fracture Mechanics", Martinus Nijhoff Publisher, Dordrecht pp.79-85.
6 M. Aklyama, C. N. Xu, H. Matsui, K. Nonaka, and T. Watanabe, 2000 "Visualization of Stress Distribution Using Mechanoluminescence from Sr3Al206 : Eu and the nature of the Luminescence Mechanism", Philos. Mag. Lett., 79, No. 9, pp. 735-740.   DOI   ScienceOn
7 ASTM Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials, ASTM E399 83.
8 C. N. Xu, T. Watanabe, M. Akiyama, and X. G. Zheng, 1999 "Direct View of Stress Distribution in Solid by Mechanoluminescence", Appl. Phys. Lett., 74, No. 17, pp. 2414-2416.   DOI   ScienceOn
9 K. S. Sohn, S.Y. Seo, and H.D. Park, 2003, "Combinatorial Searching for a New Tb activated Phosphor of High efficiency at VUV excitation", J. Electrochem. Soc., 150, No. 8, in Press.