退火及化学钢化硅酸盐玻璃的动态弯曲力学行为研究

利用电子万能试验机和改进的分离式Hopkinson压杆装置分别对退火硅酸盐玻璃及化学钢化硅酸盐玻璃试样进行了加载速率为1.67×10-6 m/s和2.5 m/s的三点弯曲实验，动态加载实验中验证了杆端的加载载荷平衡，确保实验结果的有效性，同时实验过程中利用高速摄像机记录了玻璃试样的动态破坏过程.实验结果表明:由于表面钢化层预压应力的存在，化学钢化玻璃弯曲强度较退火玻璃有较大提高，且强度分散性降低.随着加载速率的提高，玻璃试样的弯曲强度有明显提高，强度分散性有所下降，动态加载条件下试样表现出多裂纹成核扩展的破坏模式. 

Dynamic Flexural Mechanical Behavior of Annealed and Chemically Strengthened Silicate Glass

By using an electronic universal testing machine and a modified split Hopkinson pressure bar device, three-point bending tests were conducted on annealed and chemically strengthened glass at the loading speed of 1.67×10^-6 m/s and 2.5 m/s. In dynamic tests, the force equilibrium between the incident and transmitted bar end was validated to prove the validity of dynamic results. A high-speed camera was also used to record the failure process of the specimens during the tests. The experiment results are as follows:the flexural strength of chemically strengthened glass is higher than that of annealed glass significantly, and the strength dispersion of chemically strengthened glass decreases, due to the existence of surface pro-compression stress. With the increase of loading speed, the flexural strength of glass specimens increases significantly and the strength dispersion decreases. Under dynamic loading conditions, multiple cracks form and propagate in the specimens.