模具-复合材料相互作用的复合材料固化变形仿真方法研究

doi:10.19936/j.cnki.2096-8000.20231028.002

摘要/Abstract

摘要： 针对L形复合材料结构固化变形所引起的装配问题,建立了考虑模具-复合材料相互作用的复合材料固化变形仿真模型。首先,利用设置摩擦系数与最大剪切应力的方法,表征成型阶段模具对复合材料结构的剪切滑移效应。其次,考虑复合材料各向异性、材料热胀冷缩效应以及基体化学收缩效应对结构本身固化变形的影响。最后,利用固化硬化瞬时线弹性本构模型,在有效提升计算效率的前提下实现固化变形仿真计算。在此基础上,通过设计不同厚度、不同铺层顺序的L形结构件固化变形实验,验证仿真模型的有效性。实验和仿真分析结果比对最大误差为-20.8%,平均误差为-7.35%。结果表明:对于铝制模具制备的L形结构件,模具与复合材料相互作用会加剧结构的固化变形情况,并且结构刚度对这种变形有重要影响作用。

关键词: 复合材料, 固化变形, 有限元分析, 模具作用, 固化反应

Abstract: For the assembly problems caused by the curing deformation of L-shaped composite structure, a simulation model of the curing deformation of composite considering the tool-part interaction was established. Firstly, the shear slip effect of the tool on the composite structure during curing process was characterized using the method of setting the friction coefficient with the maximum shear stress. Secondly, the effects of composite anisotropy, material thermal expansion and contraction, and matrix chemical shrinkage on the curing deformation were considered. Finally, the cure hardening instantaneously linear elastic model was used to realize the curing deformation simulation calculation under the premise of effectively improving the computational efficiency. On this basis, the validity of the simulation model was verified by designing experiments of curing deformation of L-shaped structures with different thicknesses and different lay-up sequences. The experimental and simulation analysis results were compared with a maximum error of -20.8% and an average error of -7.35%. The results show that for L-shaped structural parts prepared by aluminum molds, the tool-part interaction exacerbates the curing deformation situation of the structure, and the structural stiffness plays an important role in this deformation.

Key words: composite, curing deformation, finite element analysis, tool-part interaction, curing reaction

中图分类号:

TB332

元振毅, 魏方见, 孔令飞, 杨振朝, 同新星, 李言. 模具-复合材料相互作用的复合材料固化变形仿真方法研究[J]. 复合材料科学与工程, 2023, 0(10): 10-16.

YUAN Zhenyi, WEI Fangjian, KONG Lingfei, YANG Zhenchao, TONG Xinxing, LI Yan. Simulation method for curing deformation of composite part considering tool-part interaction[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(10): 10-16.

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