| Title |
In-situ Monitoring of Catastrophic Fracture Behavior in MgO Stabilized ZrO2 by using M-L Paint. |
| Authors |
김지식(Ji Sik Kim); 손기선(Kee Sun Sohn); 고향진(Hyang Jin Koh); 이완두(Wan Boo Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Mechano-Luminescence; M-L; Paint; Crack Propagation; Transformation (Crack Wake) Zone; Mg-PSZ |
| Abstract |
The recently devlopoped ML(Mechano-Luminescence) technique enables macro-scale visualization of crack propagation during catastrophic failure, together with transformation zone (crack wake) in both crack front and side areas of Mg-PSZ in realistic time frame. The ML made it possible to precisely detect a relatively fast crack propagating in the speed range from 5 to 15 m/sec, thereby realizing so-called quasi-dynamic R-curve. A systematic observation of growth in wake height, as well as wake length, was made successfully in quasi-dynamic condition. Effective-toughening applied-stress intensity factor increased up to 22 MPa(m)(1/2). The h0 values obtained from the ML observation deviated significantly from that predicted by Evans-McMeeking model(J. Am. Ceram. Soc. 65,242(1982)); rahter it supports Marshall et al.`s results by interference microscopy and Raman spectroscopy (J Am. Ceram. Soc. 73,2659(1990)) in the quasi-static crack propagation. It was also mentioned that conventional R-curves spanning over several millimeters range reported for long-crack systems such as DCB(Double Cantilever Beam), CT(Compact Tension), SENB(Single Edged Notched Bar), and etc. can not be explained by Evans-McMeeking model. |