静水圧下におけるガラスのねじり強度

抄録

This paper presents an investigation on the effect of hydrostatic pressure on the strength of brittle materials. Pyrex glass was taken as the test material. Hollow and solid cylinders of Pyrex glass, naked or coated with thin rubber films, were twisted under hydrostatic pressures up to 1000kg/cm².
The torsional strength of the coated specimens increased with the superimposed hydrostatic pressure, while that of the naked ones exhibited no significant change. It was observed that fracture started from a surface flaw.
The effect of hydrostatic pressure on the torsional strength of glass may be explained using the concept of critical stress intensity factor for a part-through surface crack.