Tensile fracture characteristics of C/SiC composites under different high temperatures by using digital image correlation technique
We have prepared a kind of continuous carbon fiber reinforced silicon carbide matrix (C/SiC) composite by precursor infiltration and pyrolysis method, and in-situ studied the failure behaviors of C/SiC composites with tensile tests and modified digital image correlation technique under different high temperatures.The full/local displacement, strain and cracking information of C/SiC specimens were real-time monitored and recorded, thanks to the improved DIC technique with special speckle pattems that can reach up to 1600℃.The results show that elastic modulus and tensile strength of C/SiC composites gradually increase from 62.7 GPa and 209.8 MPa at room temperature to 91.3 GPa and 221.6 GPa at 600 ℃, respectively.And then decrease from 91.3 GPa to 31.6 GPa, from 221.6 MPa to 131.3 MPa after 600 ℃, respectively.New failure mechanisms of C/SiC composites under different temperatures were found and discussed with the aid of scanning electron microscope (SEM) techniques after high temperature tensile tests.The developed experimental method and results may shed some light on assessing the reliability and durability of C/SiC composites at high temperatures.
C/SiC composites Digital image correlation High temperature Tensile strength Elastic modulus
J.Chen W.Zhang X.L.Ma W.G.Mao Q.S.Ma D.N.Fang
School of Materials Science and Engineering, Xiangtan University, Hunan 411105, China Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, P.R.Chi
国内会议
长沙
英文
270-277
2016-11-11（万方平台首次上网日期，不代表论文的发表时间）