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Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (1): 175-180.doi: 10.3969/j.issn.1000-1093.2022.01.019

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Dynamic Mechanical Properties of Al2O3/SiC Composite Ceramic Subjected to Impact Loading

DANG Quanyong1, GE Yanxin2, GAO Yubo2   

  1. (1.School of Architecture and Surveying Mapping Engineering, Shanxi Datong University, Datong 037009, Shanxi, China; 2.School of Science, North University of China, Taiyuan 030051, Shanxi, China)
  • Online:2022-03-01

Abstract: The study of dynamic mechanical properties and micro-fracture mode of ceramic is the key to understand the damage mechanism of ceramic under impact loading. For the Al2O3/SiC composite ceramic, the split Hopkinson bar apparatus was used to impose the one-dimensional stress wave on a sample, and the SEM analysis was carried out on the recycled granules of fractured sample. Results show that the uniform loading of the sample is achieved by one-dimensional stress wave loading experiment. The strength of Al2O3/SiC composite ceramic is increased with increase in strain rate, which indicates the positive correlation of strain rate sensitivity for the composite ceramic. Due to the microstructure of material, the strength of Al2O3/SiC composite ceramic is close to that of Al2O3 ceramic (AD995, AD999 and so on). And the variaton tendency of ceramic strength with strain rate falls in between those of AD95 ceramic and high-density Al2O3 ceramic. A large number of intergranular fracture zones and a small number of transgranular fracture zones exist in the fracture surface on the side of the sample due to the influence of rarefaction wave on the sample. And a slip line under shear stress occurs in the transgranular fracture zone. However, the fracture surface of debris inside the sample is relatively smooth, and has more transgranular fracture zones and a small number of shear slip lines on it. The micro-cleavage fracture characteristics do not exist in the surrounding grains in the core zone.

Key words: Al2O3/SiCcompositeceramic, compressivestrength, strainratesensitivity, fracturemechanism

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