An Experimental Study on Mechanical Modeling of Ceramics Based on Microstructure

Applied Sciences

Ya-Nan Zhang²  Bin Lin¹  Jian-Jun Liu²  Xiao-Fei Song²  Jie Yang² 

[1] Key Laboratory of Advanced Ceramics and Machining Technique, Ministry of Education Tianjin University, Building 10, NO. 92, Weijin Road, Nankai District, Tianjin 300072, China;

关键词: crystalline ceramics;    non-crystalline ceramics;    grain size;    single-grit grinding force;    intergranular fracture;    transgranular fracture;   

DOI  :  10.3390/app5041337

来源: mdpi

【 摘 要 】

The actual grinding result of ceramics has not been well predicted by the present mechanical models. No allowance is made for direct effects of materials microstructure and almost all the mechanical models were obtained based on crystalline ceramics. In order to improve the mechanical models of ceramics, surface grinding experiments on crystalline ceramics and non-crystalline ceramics were conducted in this research. The normal and tangential grinding forces were measured to calculate single grit force and specific grinding energy. Grinding surfaces were observed. For crystalline alumina ceramics, the predictive modeling of normal force per grit fits well with the experimental result, when the maximum undeformed chip thickness is less than a critical depth, which turns out to be close to the grain size of alumina. Meanwhile, there is a negative correlation between the specific grinding energy and the maximum undeformed chip thickness. With the decreasing maximum undeformed chip thickness, the proportions of ductile removal and transgranular fracture increase. However, the grinding force models are not applicable for non-crystalline ceramic fused silica and the specific grinding energy fluctuates irregularly as a function of maximum undeformed chip thickness seen from the experiment.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.