硫系玻璃的粘弹性及模压工艺的仿真

Viscoelastic properties of chalcogenide glasses and simulation of molding process

为了对红外玻璃的精密模压工艺进行仿真分析,利用热机械分析方法,对红外玻璃在高温下的粘弹性进行了研究。利用热机械分析仪观察玻璃在高温下的蠕变响应,对所获得的蠕变数据进行重新计算和整理,拟合获得了所需的PRONY级数的参数,并将其输入ANSYS软件,进行模压仿真。实验结果表明,玻璃在高温下会呈现出典型的粘弹性属性,其弹性模量在较长的时间后会下降5个数量级。选择微米结构进行仿真的结果表明,当模压时间超过13 min后,时间对模具腔体的填充率的影响不大。仿真分析还发现,温度和压力的大小对模压工艺的填充率有明显影响。

To simulate the precision molding process of chalcogenide glasses,thermomechanical analysis was used to study the viscoelastic properties of chalcogenide glasses under high temperatures.The creep responses of chalcogenide glasses was observed by thermomechanical analyser,and the creep data was recomputed and ordrred.By fitting the data,the parameters of PRONY series required were obtained.Molding simulation was made after inputting the data into the ANSYS software.The experiment results show that chalcogenide glasses present typical viscoelastic properties under high temperatures,and the elastic modulus reduce about 5 orders of magnitude.Simulation results of select micron structures show that it has little effect on the filling rate with the molding time exceeds 13 minutes,while magnitude of the temperature and force have obvious influence on the filling rate of the molding process.