The Effects of Thickness and Temper on the Resistance of Glass to Small Missile Impact.

摘要

Two predominate modes of failure characterize window glass breakage:uniform wind pressure and missile impact. This paper is concerned with the latter and deals with effects of sample thickness,temper,and missile weight on impact resistance of glass. Linear regressions were performed to relate these parameters to the velocity required to break various samples. Minimum velocity to break annealed glass differed from that for heat treated glass. Missile weight was more significant for annealed glass. The degree of heat treatment appeared to affect missile resistance. The minimum velocity to break a sample did not occur in the smallest thickness. The stress wave theory appears to best explain data trends.