Experimental study of Fractue of Glass: II, Experimental Data

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Abstract
Original studies and experiments that support the concept of the close association between fracture origin and flaws in glass are presented. The effect of temporary overstresses, fracture velocities during the later development of the process, and evaluation of the critical stress are discussed. Data are presented which show that temporary overstresses may weaken glass permanently and that this effect results from the slow propagation of fracture flaws. The study of fracture surfaces reveals that the velocity of the fracture crack across the section is not necessarily uniform and that the velocity characteristics of each individual fracture are determined by factors such as degree of load relaxation occurring during the dynamic phase of the process. The critical stress is estimated to be between 2.5 and 5 million lb. per sq. in., and, for any particular glass, this stress is independent of test conditions.

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