Stress interaction and crack propagation behavior of glass ceramics under multi-scratches

Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): Xue Yang, Zhongjun Qiu, Yuge WangAbstractThe interaction between scratches has a significant influence on the material removal mechanism during scratching glass ceramic. To clarify the interaction mechanism, an analytical model of stress interference considering scratch distance is established based on the interaction features between scratches to analyse the relationship between stress distribution and crack propagation. A double scratch experiment with different scratch distances was conducted on lithium aluminosilicate (LAS) glass ceramics. Experimental and analytical results show that the crack is further extended by the enhanced maximum principal stress in the case of the scratch interference. In the interaction range, the maximum principal stress decreases with increasing scratch distance. Furthermore, larger scratch distance in the interaction range is prone to achieve ductile material removal while smaller scratch distance makes the brittle material removal occurring.

Source: Journal of Non Crystalline Solids - August 11, 2019 Category: Chemistry Source Type: research