摘要
水辅注射成型(WAIM)不同于传统注射成型(CIM),其短纤维取向分布相对复杂。文中以中空直管为例,对溢流法WAIM短纤维取向进行3D数值模拟,并通过模拟结果与扫描电镜照片比对来验证短纤维取向预测模型的有效性。提取断面不同厚度处的取向张量值,分析了溢流法WAIM中短纤维取向机理。模拟结果表明,残余壁厚中短纤维取向分布具有明显的外层-壳层-内层结构特点,外层和壳层中短纤维以沿着熔体流动方向取向分布为主,垂直流动方向次之,厚度方向最弱,靠近水道的残余壁厚内层受到高压水柱影响短纤维趋于自由取向分布;对不同部位断面进行分析,由于存在不同应力场和速度场,短纤维在3个方向的取向张量沿轴向有一定变化,同时溢流口模具结构对其存在影响。
The short fiber orientation distribution in water-assisted injection molding(WAIM) is more complex than that in traditional injection molding(CIM). Taking the hollow straight tube as an example, the 3 D numerical simulation of the short fiber orientation in overflow WAIM was carried out, and the validity of the short fiber orientation prediction model was verified by comparing the simulation results with the SEM photograph. The orientation tensor values at different thicknesses of the section were extracted, and the mechanism of short fiber orientation in the overflow WAIM was analyzed. The simulation results show that the distribution of short fiber orientation in the residual wall thickness has obvious outer-shell-inner layer structure characteristics, and the short fibers in the outer layer and the shell layer are mainly oriented along the melt flow direction, and the cross-flow direction is second, the thickness direction is the weakest. The inner wall of the residual wall thickness near the water channel is affected by the high-pressure water column and the short fibers tend to be freely oriented. The short fiber orientation tensors in different sections along the axis of the part are analyzed. Due to the different stress fields and velocity fields, the short fiber orientation tensors of the three directions change in the axial direction, and the overflow port also has an influence on the short fiber orientation distribution.
作者
周海迎
柳和生
那兵
余忠
江青松
李为平
Haiying Zhou;Hesheng Liu;Bin Na;Zhong Yu;Qingsong Jiang;Weiping Li(School of Mechanical and Electrical Engineering,Nanchang University,Nanchang 330031,China;Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices,East China University of Technology,Nanchang 330013,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2019年第11期109-115,共7页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(21664002)
江西省科技厅重点研发计划(20161BBE50073)
江西省教育厅科技计划(GJJ150609)
关键词
短纤维取向
水辅注射成型
模拟仿真
实验
short fiber orientation
water-assisted injection molding
simulation
experiment
