论文名称：Mechanism of Crack Propagation for K9 Glass
论文类型：期刊论文
发表刊物：INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
收录刊物：SCIE
卷号：20
期号：5
页面范围：815-825
ISSN号：2234-7593
关键字：Crack propagation; Critical depth; Initiation crack; Crack delayed growth; SPH simulation
摘要：In order to study the mechanism of crack propagation, the varied cutting-depth scratch experiment is carried out and smoothed particle hydrodynamics (SPH) simulation method is used to assistant the investigation. The SPH simulation results reveal that crack will propagate in the direction where stress concentration exceeds the fracture toughness of K9 glass. The initial crack length in critical transition depth is calculated by combining the critical stress of fracture and the fracture toughness of K9 glass. Based on the effective plastic strain, the relation between scratching depth and crack depth is obtained. The recovery of crack tip is found and explained from the relationship between cutting depth and crack depth. Using the energy balance theory of Griffith, the variation of material internal energy is revealed. Comparing the scratching forces obtained from experiment and simulation, the validity of simulation results is verified. The phenomenon of crack delayed propagation is found in both experiment and simulation. The explanation of mechanism is given.
发表时间：2019-05-01