Dynamic Mechanical Properties of 2D-C/SiC and 2D-SiC/SiC

Abstract:

The quasi-static and dynamic compressive mechanical behaviors of two kinds of fiber reinforced SiC ceramic matrix composites including 2D-C/SiC and 2D-SiC/SiC were investigated. Their compressive behaviors of materials at room temperature and strain rate from 10^-4 to 10⁴ /s were studied. The fracture surfaces and damage morphology were observed by scanning electron microscopy (SEM). The results showed that the dynamic failure strengths of 2D-C/SiC and 2D-SiC/SiC obeyed the Weibull distribution. The Weibull modulus of the two materials were 13.70 (2D-C/SiC) and 5.66 (2D-SiC/SiC), respectively. It was found that the two kinds of fiber reinforced ceramic matrix composites presented a transition from brittle to tough with the decrease of strain rate. The 2D-SiC/SiC materials demonstrated a more significant strain rate sensitivity and smoother fracture surface compared to the 2D-C/SiC composites, implying that the former composites present brittle features. This was because the SiC/SiC composites possessed high density and the bonding strength in interface of fiber/matrix is very strong.

• Periodical: Materials Science Forum (Volume 956)
• Pages: 244-252
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.956.244
• Online since: June 2019
• Authors: Xiao Ju Gao*, Chao Li, Hasigaowa Hasigaowa, Zhi Peng Li, Yu Guang Bao, Yan Li Wang, Shuang Yan Yang, Peng Man
• Keywords: C Fiber, Dynamic Compressive, Failure Mode, SiC Fiber, Weibull Distribution

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