Impact Studies On Glass Containers

Three types of stress are produced in the surface of a glass bottle when impacted. However, for most bottles only two are of importance, hinge stress in the external surface and flexure stress in the internal surface. Strain gauge studies were carried out to measure the extent and distribution of hinge and flexure stresses occurring at the moment of impact, and empirical formulae were obtained relating the extent of maximum stress to the glass thickness. In a further investigation, the breaking stresses for both internal and external surfaces of glass containers were obtained, and some predictions made concerning the effect of surface treatment or other glass strengthening techniques on the impact performance of bottles.