An Analysis of Using the Method of Two-Dimensional Digital Image Correlation in Glass Column Research

The study of glass multilayer columns made of ordinary glass using triplexing technology. The main disadvantage of using ordinary glass is the fragile nature of its destruction, it breaks instantly. To avoid this effect, triplexing technology is used: the glass is joined in several layers with an EVASAFE polymer film (Bridgestone, Japan), after which the columns were heated to a temperature of 130 °C and kept for 30 minutes. The film material is an elastomer (a polymer with highly elastic properties in a wide temperature range). This allowed restraining parts of fragments of glass structures, making them plastic inside the bonding plane, increased their reliability, prevented the instantaneous opening of cracks in the depth of the section. A method for studying multilayer glass columns for central-axial compression using the method of two-dimensional digital image correlation is developed. Two series of prototypes were manufactured and tested. The tests were performed on a hydraulic press. The model of the destruction of glass columns of different cross-section is investigated and described. The accuracy of the digital image correlation method using two-dimensional correlation for glass centrally compressed columns is estimated. The results of the digital image correlation method with the results of measurements of absolute deformations by mechanical devices are compared. Based on the analysis of the results, the dependences of relative deformations e on the applied load N were determined using the digital image correlation method. The dependences of relative deformations e on normal stresses σ=N/A and dependences of relative deformations e on the outer glass surfaces on the applied load N are determined