Abstract Quasi-static and dynamic three-point-bending experiments were conducted on both annealed and chemically strengthened aluminosilicate glass scratched by different normal loads. Scratched areas were observed by optical microscope and atomic force microscope. Chemically strengthened glass shows better resistance to surface scratch. These dynamic experiments were carried out using a modified Split Hopkinson Pressure Bar (SHPB) device and a pulse-shaping technique was used to keep constant loading speed to the specimens. In tests, high-speed photography was also used to observe the failure process of the specimens. The test results showed that the flexural strength of aluminosilicate glass (AG) strongly depends on the applied loading speed. Compared with its annealed counterpart, the chemically strengthened glass (CSG) showed higher flexural strength to both static and dynamic loadings. Moreover, the three-point bending experiments were conducted on scratched AG and CSG specimens and decrease of 20–40% in flexural strength was observed. The fractography analysis showed that in dynamic loading conditions the fracture surface was not smooth and has more secondary cracks as compared to static loading.

中文翻译：

---

加载速度和表面划痕对铝硅酸盐玻璃弯曲强度影响的比较研究：退火与化学强化

摘要 对经不同法向载荷划伤的退火和化学强化铝硅酸盐玻璃进行了准静态和动态三点弯曲实验。用光学显微镜和原子力显微镜观察划痕区域。化学强化玻璃具有更好的抗表面划伤能力。这些动态实验是使用改进的 Split Hopkinson 压力棒 (SHPB) 设备进行的，并且使用脉冲整形技术来保持对样品的恒定加载速度。在试验中，还采用高速摄影来观察试件的破坏过程。测试结果表明，铝硅酸盐玻璃 (AG) 的弯曲强度很大程度上取决于施加的加载速度。与其退火的对应物相比，化学强化玻璃 (CSG) 在静态和动态载荷下均表现出更高的弯曲强度。此外，对有划痕的 AG 和 CSG 试样进行了三点弯曲实验，观察到弯曲强度降低了 20-40%。断口分析表明，在动态加载条件下，断口表面不光滑，与静态加载相比，具有更多的二次裂纹。