206 Fundamental Study on Deformation and Strength of Quench-Hardened Plate Glass

Abstract

Out-of-plane deformation and strength of the quench-hardened circular plate glass are studied. First, deformation of plate glass is measured by using reflection of laser beam on the specimen surface and it is revealed that there arises anti-clastic deformation in the plate glass through quench-hardening. Fracture stress is obtained for the plate glass under concentrated load. There is no relationship between the deformation and the fracture stress. Moreover, thermal stress is analyzed for the plate glass by using a light source and strain gage, and it is shown that there arises compressive stress of approximately 300MPa at the central area of the plate.