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倪新华,于金凤,刘协权,杜志鸿,徐达.共晶复相陶瓷细观结构对抗冲击强度的影响[J].稀有金属材料与工程(英文),2019,48(9):2808~2814.[Ni Xinhua,Yu Jinfeng,Liu Xiequan,Du Zhihong and Da Xu.Inherent Relationship between Microstructure Parameters and Anti-impact Strength of Eutectic Composite Ceramic[J].Rare Metal Materials and Engineering,2019,48(9):2808~2814.]
Inherent Relationship between Microstructure Parameters and Anti-impact Strength of Eutectic Composite Ceramic
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Received:April 12, 2018??Revised:May 03, 2018
DOI:
Key words:?interface defects??anti-impact strength??eutectic composite ceramic??micromechanical strength??dynamic destruction criterion
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Ni Xinhua,Yu Jinfeng,Liu Xiequan,Du Zhihong and Da Xu??
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Abstract:
??????The inherent relationship between the microstructure parameters and anti-impact strength is established by micromechanical strength and dynamic destruction criterion of eutectic composite ceramic. Firstly, in line with the microstructure characteristic of eutectic composite ceramic, the effective stress field of composite ceramic is computed by the interaction direct derivative estimate and sufficiently simplified calculation method. Secondly, according to equivalent inclusion method and Griffith micro-crack propagation theory, the micromechanical strength of eutectic ceramic composite is predicted. Thirdly, the dynamic destruction criterion of the comminuted zone is built by the unified pressure shear criterion. Finally, on account of the dynamic destruction criterion which is associative with microstructure, the calculated mode of anti-impact strength is obtained. The influence of microstructure parameters on anti-impact strength is quantitatively analyzed. Results show that decrease in interface defect size among eutectic grains and increase in eutectic grain stiffness will increase anti-impact strength.