Regarding the possibility of using the SEVNB method to determine the fracture resistance of glass

Abstract

Background. Today, methods have been developed that take into account the of the feature initiation and development of cracks in the material during fracture, and the corresponding calculation equations have been proposed. However, the problem of reliably determining the fracture resistance of glass is relevant and requires attention when creating responsible elements of constructions. Objective. Solving the problem of the possibility of determining the fracture resistance of glass of different chemical composition by the SEVNB method, checking the reliability of the obtained results by comparing them with data from literary sources. Methods. The SEVNB method consisted in testing of the standard sample with an applied stress concentrator in the form of a V-notch under three or four-point bending. Results. The values of the critical stress intensity factor of the studied glasses were determined within 0.5...1.0 MPa·m1/2. The subject of research was silicate float glass for technical purposes (soda-lime glass), quartz (fused silica glass) and optical (heavy flint SF5) glass. Conclusions. The obtained values of the fracture resistance of the glasses were conformed with the known literary data of its determination according to the IF method common in practice. It has been shown that the SEVNB method can be used to determine the fracture resistance of glasses provided that all the testing requirements specified in BS EN ISO 23146:2016 are met. The research method allows obtaining results with tolerable accuracy and can be considered open and relatively simple for its using in scientific research and production spheres.