Title: An approach to calculate master curve for glass moulding press based on finite element simulation

Authors: Zhiguo Zhang; Yuxuan Sun

Addresses: College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin, 300222, China; Tianjin Key Laboratory of Integrated Design and Online Monitoring for Light Industry and Food Machinery and Equipment, Tianjin, 300222, China ' College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin, 300222, China

Abstract: A new approach is proposed to calculate the master curve (MC) of glass. It can solve the problem: when the temperature is higher than Tt,l (defined later), the measured shear relaxation modulus cannot describe the mechanical response of the annealing stage during glass moulding press (GMP) through the thermal rheological simple (TRS) theory. Based on the temperature dependent Yang's modulus and TRS theory, the MC with a reference temperature less than Tt,l is calculated by an iterative process. In order to verify the suitability of MC at high temperature, the MC and shear relaxation moduli are used in the finite element (FE) simulation at the isothermal compression stage. Similar von Mises stresses are shown and the usability of the MC at moulding temperature is proved by the simulation results. In order to predict residual stress within the formed glass lens, the MC is used to conduct FE simulation for the whole GMP process.

Keywords: glass moulding press; GMP; viscoelasticity; thermal rheological simple; TRS; master curve; finite element; nanomanufacturing.

DOI: 10.1504/IJNM.2020.106241

International Journal of Nanomanufacturing, 2020 Vol.16 No.2, pp.160 - 172

Received: 27 Oct 2017
Accepted: 07 May 2018

Published online: 09 Mar 2020 *

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