209 レンズ成形シミュレーションへの熱粘弾性理論の適用(OS1-1 解析・シミュレーション,オーガナイズドセッション1 計算固体力学の最新応用)

概要

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In the present paper, numerical simulation about press forming process of glass lens using finite element method is demonstrated. Generally, material properties of glass, e.g. viscoelastic constants and coefficient of thermal expansion, depend on time-history and temperature. In the present study, creep test has been conducted to determine the thermoviscoelastic properties of glass. The creep function obtained by the actual measurement has been transformed into relaxation function employing Laplace transform and its inversion. Shift factor which gives the relation between the time and temperature can be determined by creep test, too. Some numerical simulation by FEM are executed to obtain the residual stress and residual deformation under several thermal conditions changing the cooling time, and the optimal condition during forming process of glass lens is discussed in detail.
社団法人日本機械学会の論文
2005-03-01