Investigation on the viscoelasticity of optical glass in ultraprecision lens molding process
Investigation on the viscoelasticity of optical glass in ultraprecision lens molding process
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DOI：
10.1016/j.jmatprotec.2008.10.030
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发表时间：
2009-05-01
影响因子：
6.3
通讯作者：
Kuriyagawa, Tsunemoto
中科院分区：
文献类型：
--
作者：
Zhou, Tianfeng;Yan, Jiwang;Kuriyagawa, Tsunemoto
类模压机是一种复杂形状超精密光学元件的高效制造技术。在玻璃成型过程中，玻璃的粘弹性是决定玻璃在成型温度周围变形行为的一个重要方面。本文利用超精密玻璃成型机，在玻璃转变温度以上单轴压缩圆柱形玻璃预制件，实验测量了玻璃的粘弹性。玻璃的弹性模量和黏度分别采用Burgers模型和Maxwell模型进行曲线拟合。基于实验得到的热力学和粘弹性参数，对玻璃成型过程进行了有限元模型仿真，可以直观地显示玻璃内部的应力/应变分布，并预测玻璃内部的残余应力。(C) 2008 Elsevier B.V.版权所有
Class molding press is an efficient manufacturing technology for ultraprecision optical elements with complex shapes. In glass molding, viscoelastic property of glass is an essential aspect that determines the glass deformation behavior around the molding temperature. In this paper, viscoelasticity of glass has been measured experimentally by uniaxially compressing cylindrical glass preforms above the glass transition temperature using an ultraprecision glass molding machine. The elastic modulus and viscosity of glass were obtained by curve fitting techniques using the Burgers model and the Maxwell model for creep and stress relaxation, respectively. Based on the thermo mechanical and viscoelastic parameters obtained from experiments, finite element model simulations of the glass molding process were performed, which can be used to visualize the stress/strain distribution and to predict the residual stress in glass. (C) 2008 Elsevier B.V. All rights reserved.