S. X. Wanng
,
D. S. Zheng
,
Y. L. Liu 1) Department of Material Engineering
,
Luoyang Institute of Technology
,
Luoyang 471039
,
China 2) Luoyang Copper (Group) Co.
,
Ltd
,
Luoyang
,
China
金属学报(英文版)
As far as the accuracy of calculating unsteady temperature field is concerned, it is very important to find the accurate physical parameters such as specific heat, thermal conductivity, latent heat of phase transformation and surface heat flux. The model for calculating H and Q is established in this paper. The measurement methods and data processing for physical parameters such as volume specific heat C, thermal conductivity k, volume latent heat of phase transformation c1 and surface heat flux are introduced The physical parameters of 1Cr18Ni9Ti and 45 steels and the surface heat flux for 1 Cr18Ni9Ti probe cooled in water,10% NaCl water and oil with different temperatures are measured, respectively. These data show that the probability of absolute error less than 2* C between the calculated and measured values in temperature field calculation reaches above 80% if using the above physical parameters, which provides a reliable technology basis for precise calculation of temperature field.
关键词:
unsteady temperature field
,
null
谢怀勤
,
陈幸开
,
梁钒
玻璃钢/复合材料
doi:10.3969/j.issn.1003-0999.2010.01.020
玻璃钢拉挤成型过程中其固化度和温度变化为强耦合关系.根据固化动力学和传热学理论,建立了非稳态温度场与固化动力学数学模型.通过示差扫描量热实验计算出模型中固化动力学参数.采用有限元与有限差分相结合的方法.依据ANSYS求解耦合场的间接耦合法,编制了计算程序,对拉挤工艺不同工况玻璃钢非稳态温度场和固化度进行数值模拟.采用特殊设计制作的铝毛细管封装的布拉格光栅光纤传感器,屏蔽了荷栽效应应变干扰,对玻璃钢温度场进行实时检测;采用索氏萃取实验测定玻璃钢制品固化度.实验表明,模拟与实验结果基本吻合.为避开繁多试凑性实验而进行工艺过程优化提供理论依据.
关键词:
玻璃钢
,
拉挤工艺
,
数值模拟
,
非稳态温度场
,
布拉格光栅光纤传感器
