退火及化学钢化硅酸盐玻璃的动态弯曲力学行为研究

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.