Quasi-dynamic visualization of crack propagation and wake evolution in Y-TZP ceramic by mechano-luminescence |
| |
| Authors: | J S Kim H J Koh W D Lee N Shin J G Kim K -H Lee K -S Sohn |
| |
| Affiliation: | 1.Department of Advanced Materials Engineering,Kyungpook National University,Gyeongbuk,Korea;2.Technology Planning Team,Hyundai Steel,Chungnam,Korea;3.Unitech,Gyeonggi,Korea;4.Beamline Division,Pohang Accelerator Laboratory,Korea;5.School of Electronics and Electrical Engineering,Kyungpook National University,Gyeongbuk,Korea;6.Department of Automotive Engineering,Kyungpook National University,Gyeongbuk,Korea;7.Department of Material Science & Metallurgical Engineering,Suncheon National University,Jeonnam,Korea |
| |
| Abstract: | The propagation of a macro-scale crack was visualized in yittria-tettragonal zirconia polycrystal (Y-TZP) ceramics using a
mechano-luminescence (ML) of SrAl2O4:Eu, Dy. The transformation zone around the crack was also clearly detected in both the crack front and side areas of the
Y-TZP in a realistic time frame. The ML made it possible to precisely detect a relatively fast crack propagating in the speed
range from 20 m/s to 140 m/s, thereby realizing so-called quasi-dynamic R-curve. Effective toughening then commenced and the
applied stress intensity factor increased to 20 MPa  . The ho values obtained from the ML observation deviated slightly from those predicted by the Evans-McMeeking model, and support
Marshall's simple power law model of quasi-static crack propagation. |
| |
| Keywords: | mechanoluminescence quasi-dynamic fracture crack propagation wake evolution |
| 本文献已被 SpringerLink 等数据库收录！ |
|
