Sung R. Choi
Glenn Research Center
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Sung R. Choi.
Archive | 2005
Sung R. Choi; Dongming Zhu; Robert A. Miller
The mixed-mode fracture behavior of plasma-sprayed ZrO2-8 wt% Y2O3 thermal barrier coatings was determined in air at 25 and 1316°C in asymmetric four-point flexure with single edge v-notched beam (SEVNB) test specimens. The mode I fracture toughness was found to be K Ic=1.15±0.07 and 0.98±0.13 MPa \( \sqrt m \), respectively, at 25 and 1316°C. The respective mode II fracture toughness values were K IIc=0.73±0.10 and 0.65±0.04 MPa \( \sqrt m \). Hence, there was an insignificant difference in either K Ic or K IIc between 25 and 1316°C for the coating material, whereas there was a noticeable distinction between K Ic and K IIc, resulting in K IIc/K Ic=0.65 at both temperatures. The empirical mixed-mode fracture criterion best described the coatings’ mixed-mode fracture behavior among the four mixed-mode fracture theories considered. The angle of crack propagation was in reasonable agreement with the minimum strain energy density criterion. The effect of the directionality of the coating material in on K Ic was observed to be insignificant, while its sintering effect at 1316°C on K Ic was significant.
Journal of the American Ceramic Society | 2006
Narottam P. Bansal; Janet B. Hurst; Sung R. Choi
Journal of the American Ceramic Society | 2005
Sung R. Choi; Dongming Zhu; Robert A. Miller
International Journal of Applied Ceramic Technology | 2005
Sung R. Choi; Dongming Zhu; Robert A. Miller
Surface & Coatings Technology | 2004
Dongming Zhu; Sung R. Choi; Robert A. Miller
Engineering Fracture Mechanics | 2005
Sung R. Choi; Dongming Zhu; Robert A. Miller
Journal of the American Ceramic Society | 2005
Sung R. Choi; Narottam P. Bansal
Journal of the American Ceramic Society | 2005
Sung R. Choi; Narottam P. Bansal
24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4 | 2008
Sung R. Choi; Dongming Zhu; Robert A. Miller
27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3 | 2003
Dongming Zhu; Sung R. Choi; Jeffrey I. Eldridge; Kang N. Lee; Robert A. Miller