单向增强热塑性复合材料热冲压成型仿真与优化

doi:10.19936/j.cnki.2096-8000.20221028.031

摘要/Abstract

摘要： 基于超高分子量聚乙烯纤维增强聚氨酯(UHMWPE/PUR)单向带预浸料对热冲压过程进行模拟仿真建模与工艺优化研究。首先对单向增强热塑性复合材料在热冲压过程中的力学行为进行描述,建立热-率相关的非正交次弹性本构面内剪切本构,同时考虑热相关的面内拉伸性能;使用ABAQUS进行半球热冲压成型模拟仿真;基于主曲率法,使用MATLAB对模拟结果的面外褶皱进行定性与定量评估;研究热冲压成型工艺中,三个主要参数(压边圈压强、预浸料初始温度与模具温度)与褶皱量的关系;以最小量面外褶皱为目标,使用响应面方法对热冲压模拟成型进行优化,确定压边圈压强、预浸料初始温度及模具温度的最佳工艺参数。结果表明:压边圈压强与预浸料初始温度对褶皱影响较大;响应面法能够较为准确地预测出最佳成型工艺参数。

关键词: 热塑性复合材料, 有限元分析, 单向带预浸料, 响应面法, 热冲压成型

Abstract: Based on the ultra high molecular weight fiber reinforced polyurethane (UHMWPE/PUR) unidirectional (UD) tape prepreg, the simulation modeling, experimental verification and process optimization of thermo-stamping process were studied. Firstly, the mechanical behavior of unidirectional reinforced thermoplastic composites during thermo-stamping was described, and the thermal-rate dependent non-orthogonal hypoelastic in-plane shear constitutive model was established. The thermal dependent in-plane tensile properties were considered. The commercial finite element software ABAQUS was used to simulate hemispherical thermo-stamping. Based on the principal curvature method, the out-plane wrinkling of the simulation results were qualitatively and quantitatively evaluated by MATLAB. The relationship between the three main parameters (blank holder pressure, prepreg initial temperature and die temperature)and the amount of wrinkling in thermo-stamping process was studied. Aim for the minimum amount of out-plane wrinkling, the response surface method was used to optimize the thermo-stamping simulation, and the best process parameters of blank holder pressure, prepreg initial temperature and punch temperature were determined. The results show that the pressure of blank holder and the initial temperature of prepreg have a great influence on the wrinkling. The response surface method can accurately predict the optimal molding parameters.

Key words: thermoplastic composites, finite element analysis (FEA), unidirectional prepreg, response surface methodology (RSM), thermo-stamping process

中图分类号:

TB332

张学文, 王继辉, 陈宏达, 倪爱清. 单向增强热塑性复合材料热冲压成型仿真与优化[J]. 复合材料科学与工程, 2023, 0(6): 104-114.

ZHANG Xuewen, WANG Jihui, CHEN Hongda, NI Aiqing. Numerical modeling and optimisaition in thermo-stamping process of unidirectional fiber reinforced thermoplastic composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(6): 104-114.

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