| Abstract Scope |
Dynamic contact events are the primary mode of damage introduction in glass, leading to complex deformation behaviors. Glass deforms through mechanisms such as shear flow, densification, and elastic deformation, typically studied under quasi-static conditions. However, their influence on cracking behavior under dynamic conditions remains less understood. This study investigates the cracking response of four glass compositions—normal, intermediate, and anomalous—across three strain rates ranging from 15 kg/min to 2.2e+6 kg/min. Square pyramidal indenters with tip angles of 110° and 136° were used to introduce controlled damage, with in-situ observations of cracking behavior. Crack initiation timing was recorded relative to the loading cycle, revealing a shift from the loading phase to the unloading phase as strain rate increased. Additionally, crack types transitioned noticeably. These findings underscore the critical role of strain rate in glass deformation and cracking behavior, offering valuable insights into dynamic damage processes. |