Evaluation of the performance of thick-walled cylindrical shells made of S�T-1 glass

Abstract

1. The strength of TSM506, SET-1, and MKR-1 lighting engineering glass varies in range 1225–1410 MPa, i.e., 56–64% of the ultimate strength of 13v technical glass. 2. The aqueous and oil media reduce on the whole the short-term strength of lighting engineering glass. The strength of the effect of the median depends on the type of the stress state in such a manner than the largest (up to 30%) reduction of strength is detected under the effect of tensile stresses. It is evident that this is associated with the general relationships governing the growth of surface cracks in brittle material in compression and tension in surface-active media. 3. In the glass thick-walled cylindrical shells in the examined method of connection with the rigid plug in the conditions of longitudinal compression and external pressure, the lower level of the fracture stresses of compression in the contact zone decreases by a factor of three-four in comparison with the strength of the specimens σcc determined in the tests on the flat support. This is associated with the operation of the scale-technological effect and with the unfavorable variation of the contact conditions and requires the introduction of high (five–six) strength satisfy factors to ensure the reliability of components. 4. Taking into account the real technological initial deviations of the form and dimensions of the support sections of the thick-walled cylindrical glass elements, we designed and tested in short-term and long-term (up to 100 days) effects of the external pressure and experimental batch of transparent shells. The experiments confirm that the experimental-theoretical approach is suitable for designing these objects. The selection of the permissible stresses and working loads with special reference to the devices working in the conditions of long-term static loading was justified.