Simulation of Uniaxial Compression Mechanical Properties ofSiC Ceramics with Elliptical Microvoids

JIANG Shengqiang; HE Mingxue; LI Xu; TANG Chao

doi:10.11973/jxgccl202008016

Materials and Mechanical Engineering > 2020 > 44(8): 78-83. > DOI: 10.11973/jxgccl202008016

JIANG Shengqiang, HE Mingxue, LI Xu, TANG Chao. Simulation of Uniaxial Compression Mechanical Properties ofSiC Ceramics with Elliptical Microvoids[J]. Materials and Mechanical Engineering, 2020, 44(8): 78-83. DOI: 10.11973/jxgccl202008016

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Simulation of Uniaxial Compression Mechanical Properties ofSiC Ceramics with Elliptical Microvoids

1. School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China;
2. Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University, Xiangtan 411105, China;
3. State Key Laboratory ofStructural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, China

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Received Date: July 23, 2019
Revised Date: June 11, 2020

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Abstract

Elliptical microvoid flaws with different sizes were defined and introduced into the calibrated discrete-element model of SiC ceramics. Effects of inclination angle, aspect ratio and area of the microvoid on the compression properties of SiC ceramics were studied by uniaxial compression simulation. The results show that the presence of microvoids reduced the compressive strength and elastic modulus of the sample and improved the Poisson's ratio. With a relatively small inclination angle, the larger the aspect ratio of the microvoid, the smaller the compressive strength and elastic modulus of the sample, and the higher the Poisson's ratio. With increasing inclination angle, the effect of the aspect ratio on the compressive strength, elastic modulus and Poisson's ratio gradually decreased. When the inclination angle increased above 60°, the compressive strength, elastic modulus and Poisson's ratio were close to those of the non-defective samples. With decreasing microvoid area, the effect of the aspect ratio and inclination angle on the compressive strength of the sample gradually decreased. When the aspect ratio of the microvoid was 1 or the inclination angle was 90°, increasing the void area had little effect on the compressive strength.
- SiC ceramics,
- elliptical microvoid flaw,
- mechanical property,
- discrete-element method,
- uniaxial compression simulation

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