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J. Korean Ceram. Soc. > Volume 47(6); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(6): 491.
doi: https://doi.org/10.4191/kcers.2010.47.6.491
SiC 세라믹스 탄성률의 온도 의존성
임종인, 박병우, 신호용, 김종호
한국세라믹기술원 기업지원본부 시뮬레이션센터
Temperature Dependence on Elastic Constant of SiC Ceramics
Jong-In Im, Byoung-Woo Park, Ho-Yong Shin, Jong-Ho Kim
Simulation Center, Business Support Division, KICET
ABSTRACT
In this paper, we employed the classical molecular dynamics simulations using Tersoff's potential to calculate the elastic constants of the silicon carbide (SiC) crystal at high temperature. The elastic constants of the SiC crystal were calculated based on the stress-strain characteristics, which were drawn by the simulation using LAMMPS software. At the same time, the elastic constants of the SiC ceramics were measured at different temperatures by impulse excitation testing (IET) method. Based on the simulated stress-strain results, the SiC crystal showed the elastic deformation characteristics at the low temperature region, while a slight plastic deformation behavior was observed at high strain over $1,000^{circ}C$ temperature. The elastic constants of the SiC crystal were changed from about 475 GPa to 425 GPa by increasing the temperature from RT to $1,250^{circ}C$. When compared to the experimental values of the SiC ceramics, the simulation results, which are unable to obtain by experiments, are found to be very useful to predict the stress-strain behaviors and the elastic constant of the ceramics at high temperature.
Key words: Silicon carbide (SiC), Molecular dynamics simulations, Impulse excitation test, Stress-strain characteristics, Elastic constants
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