Algorithm for accurate shear relaxation modulus analysis in glass viscoelasticity characterization

Numerical simulation of the glass molding process and analysis of material viscoelasticity are growing increasingly significant as the research on optical-device glass molding intensifies. An accurate and efficient analytical algorithm for the shear relaxation modulus in the viscoelasticity characterization of glass was developed in this study. We measured the high-temperature creep curve, friction coefficient, and elastic modulus of glass (D-LaF50) according to the requirements for viscoelasticity characterization. The viscoelastic behavior of glass was characterized based on the analytical algorithm and test results. A finite element analysis model was developed to verify the accuracy of the analytical algorithm. The results show that the error of the proposed algorithm's numerical simulation compared to the test results is within 5%.