Mechanical properties and real-time damage evaluations of environmental barrier coated SiC/SiC CMCs subjected to tensile loading under thermal gradients

SURFACE & COATINGS TECHNOLOGY

卷:284

Article

Appleby, M. P.^1,2  Zhu, Dongming¹  Morscher, G. N.² 

[1] NASA Glenn Res Ctr, Cleveland, OH 44135 USA

[2] Univ Akron, Dept Mech Engn, Akron, OH 44325 USA

关键词: Environmental barrier coating;    Ceramic matrix composite;    Electrical resistance;    Acoustic emission;    Digital image correlation;   

DOI  :  10.1016/j.surfcoat.2015.07.042

来源: Elsevier

【 摘 要 】

Environmental barrier coating (EBC) coated ceramic matrix composite (CMC) systems are currently being investigated for use as turbine engine hot-section components in extreme environments. In these extreme conditions, it becomes critical to understand material response to environmental exposure and performance under thermo-mechanical loading. Electrical resistance (ER) monitoring has recently been correlated to tensile damage accumulation in SiC/SiC CMCs, and the focus of this study is to extend the use of ER to evaluate high-temperature thermal gradient fracture of EBC/CMC systems. Tensile strength tests were performed at high temperature (1200 degrees C) using a laser-based heat-flux technique. Specimens included an as-produced SiC/SiC CMC and coated SiC/SiC substrate that have been exposed to simulated combustion environments in a high-pressure burner rig. Localized stress-dependent damage was determined using acoustic emission (AE) monitoring and compared to full-field strain mapping using a high-temperature digital image correlation (DIC) technique. The results are compared with in-situ ER monitoring, and post-test inspection of the samples in order to correlate ER response to damage evolution. Published by Elsevier B.V.

【 授权许可】

Free