Open AccessStudy on the effect of sample shapes on the thermal shock behavior of ZrB 2 ‐SiC‐Graphite sharp leading edge
Author(s) -
Wang Anzhe,
Liao Hailong,
Zhang Tao,
Jiang Minqi,
Guo Fuxiao,
Wang Yongzheng
Publication year - 2020
Publication title -
international journal of ceramic engineering and science
Language(s) - English
Resource type - Journals
ISSN - 2578-3270
DOI - 10.1002/ces2.10041
Subject(s) - materials science , graphite , thermal shock , wedge (geometry) , composite material , scanning electron microscope , curvature , enhanced data rates for gsm evolution , thermal , shock (circulatory) , geometry , medicine , telecommunications , mathematics , physics , meteorology , computer science
Reliable evaluation of the thermal shock behavior of sharp leading edges (SLEs) was hampered by a lack of available experimental method in past decades. Herein, a novel water spraying method was utilized to investigate the shape effect of ZrB 2 ‐SiC‐Graphite SLEs during thermal shock. Experimental results indicated that the critical failure temperature of ZrB 2 ‐SiC‐Graphite SLEs was most sensitive to the wedge angle, which could lead to a dramatic attenuation by about 35% from 12° to 9°, and was relatively little affected by the tip radius of curvature and the thickness. Simulation results further revealed that the decay of critical failure temperature was mainly due to the significant stress concentration caused by the reduction of wedge angle. Scanning electron microscopy observation proved that cracks tend to bypass graphite flakes due to their weak interfacial bonding, while branching always occurred when encountering hard phases or inclusions.