光-热双固复合材料3D打印成型数值模拟及实验验证

doi:10.3901/JME.2023.15.293

摘要/Abstract

摘要： 光-热双固化碳纤维增强复合材料3D打印成型综合了增材制造零件高精度无模快速成型和热固化基质材料力学性能优良的优势,具有广阔的应用前景。针对光-热双固化复合材料制件变形带来的制件疲劳寿命降低以及连接装配损伤等问题,综合考虑光固化动力学、热固化动力学及固化变形建立了光-热双固复合材料成型的多物理场理论模型,研究了复合材料光-热双固3D打印成型过程中单层固化厚度、光-热双固数值材料组分及纤维含量和长径比对制件变形的影响,并通过实验验证了模型及理论分析结论的正确性。结果表明,增加单层固化厚度从而减少分层数可以降低制件固化后的应力应变和翘曲变形;光-热双固化树脂中光固化树脂分数增加会使制件的翘曲变形量增大;提高纤维体积分数和纤维长径比可以降低制件膨胀系数,从而降低制件的翘曲变形量。复合材料光-热双固化3D打印成型过程的多物理场建模计算方法可以为相关研究提供借鉴,基于该方法的研究结果对于优化工艺参数从而提升成型质量具有参考价值。

关键词: 光-热双固化, 3D打印, 多物理场耦合, 数值模拟, 翘曲变形

Abstract: Carbon fiber reinforced dual-curing polymer composites 3D printing process incorporates both the advantage of rapid free-form prototyping of additive manufacturing and the good mechanical properties of thermoset composites and then shows broad applications. In order to solve the problem of fatigue life reduction and joint assembly damage due to the residual stress in composites part caused in dual-curing process, a multi-physics theoretical model of UV-thermal dual-curing composite part forming is established, in which, the UV-curing kinetics, thermal curing kinetics and curing deformation are all considered. The effects of the sliced layer thickness in 3D printing, the volume fraction of the UV-curing resin in hybrid polymer composites, the carbon fiber content and the fiber aspect ratio on the deformation of the fabricated composites part in dual-curing process have been investigated. The corresponding experiments are performed and the correctness of the theoretical model and the simulation results are verified. The results show that increasing the sliced layer thickness and then reducing the total number of layers can reduce the stress-strain and deformation of the fabricated part. The increase of the content of UV-curing resin in the dual-curing resin will increase the deformation of the part. Increasing the carbon fiber volume fraction and fiber aspect ratio can reduce the expansion coefficient and deformation of the part. In this work, a multi-physics modeling and numerical calculation method for the UV- thermal dual-curing process of composite materials is proposed, the research results based on which can be used for process parameters optimization and then part fabrication quality improvement.

Key words: UV-thermal dual curing, 3D printing, multi physical field coupling, numerical simulation, warping deformation

中图分类号:

TB332

王权岱, 强昊文, 叶思彤, 李鹏阳, 郑建明, 李言. 光-热双固复合材料3D打印成型数值模拟及实验验证[J]. 机械工程学报, 2023, 59(15): 293-303.

WANG Quandai, QIANG Haowen, YE Sitong, LI Pengyang, ZHENG Jianming, LI Yan. Numerical Simulation and Experimental Verification of UV-thermal Dual-cure Composites Part 3D Printing Process[J]. Journal of Mechanical Engineering, 2023, 59(15): 293-303.

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