连续纤维增强聚合物复合材料 3D 打印中的热行为分析

Shixian Li
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摘要

摘要。熔融长丝制造(FFF)作为一种增材制造工艺,是一种热驱动方法,用于生产工程应用中的连续纤维增强复合材料。层间分层是采用 FFF 工艺制造复合材料的一个重要问题。为了解决层间分层问题并提高 FFF 纤维复合材料的宏观力学性能,有必要研究连续纤维填充复合材料在沉积过程中的热行为。本文提出了一种考虑连续纤维的热模拟模型。数值模拟再现了实验温度的变化趋势。当传热模型中省略连续纤维相时,界面处的预测再加热温度低于红外监测测得的温度。这一结果突出表明,为了准确预测界面处的再加热温度,开发一个将连续纤维相考虑在内的数值模型至关重要。这种模型对于深入探讨相邻层和相邻纤维丝之间的粘附机制至关重要。
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Analysis of thermal behavior in 3D printing of continuous fiber reinforced polymer composites
Abstract. Fused filament fabrication (FFF) as an additive manufacturing process, is a thermal driven method used to produce continuous fiber reinforced composites for engineering applications. Interlayer delamination is a significant concern for composites manufactured by FFF process. To address the problem of interlayer delamination and enhance the macro-mechanical properties of FFF fiber composites, it is necessary to study the thermal behavior of continuous fiber filled composites during the deposition process. A thermal simulation model with the consideration of continuous fiber was proposed. The numerical simulations reproduce the trends of experimental temperature evolution. When the continuous fiber phase is omitted from the heat transfer model, the predicted reheating temperature at the interface is lower compared to the temperature measured via IR monitoring. This result highlights the critical necessity of developing a numerical model that takes the continuous fiber phase into account in order to accurately predict the reheating temperature at the interface. Such a model is essential for deeper exploration into the adhesion mechanisms between adjacent layers and adjacent filaments.
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