增强连续纤维3d打印热塑性复合材料的工艺与力学性能

Anton Karvatskii, Vladyslav Solovei
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摘要

背景。基于熔融沉积建模(FDM)建模方法的增材技术以其投资成本低、易于生产等优点受到了业界和科研团体的广泛关注。如果正确选择加工参数,则可以获得与传统工艺获得的产品力学性能接近的产品。目标。采用FDM方法对连续凯夫拉纤维增强聚乳酸(PLA)样品进行3D打印的现代化技术的实际实施,并测定了其机械性能。方法是基于复合材料抗拉强度和弹性模量极限的实验和理论研究,包括在SHIMADZU AGS-X试验机上对样品进行测试和求解反问题。结果。对热塑性复合材料(PLA+Kevlar纤维Æ0.3 mm)的实验样品进行了拉伸测试。结果表明,当凯夫拉体积分数为12%时,增强复合材料的抗拉强度比未增强复合材料提高2.38倍,弹性模量提高1.45倍。在0.68的置信区间内,确定极限抗拉强度的误差为3.5%,弹性模量的误差为4.5%。理论依赖于预测热塑性复合材料的弹性模量在变化范围内的增强程度高达15%。结论。基于FDM的增材技术在热塑性复合材料3D打印中的应用,提高了材料的力学性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Technology and mechanical properties of reinforced continuous fiber 3D-printed thermoplastic composite
Background. Additive technologies based on Fused Deposition Modeling (FDM) modeling methods attract a lot of attention from both industry and research groups, which is explained by low investment costs, ease of production, etc. If the processing parameters are correctly selected, products with mechanical properties close to products obtained by traditional technologies can be obtained. Objective. Practical implementation of the modernized technology for 3D printing of Polylactid Acid (PLA) samples reinforced with continuous Kevlar fiber using the FDM method and determination of their mechanical properties. Methods is based on experimental and theoretical studies of the limit of tensile strength and modulus of elasticity of the composite and includes testing of samples on the SHIMADZU AGS-X testing machine and solving the inverse problem. Results. Experimental samples of thermoplastic composite (PLA+Kevlar fiber Æ0.3 mm) were tested for tension. It was found that the tensile strength of the reinforced composite compared to the unreinforced one with a Kevlar volume fraction of about 12% increases by 2.38 times, and the modulus of elasticity increases by 1.45 times. With a confidence interval of 0.68, the error of determining the ultimate tensile strength is 3.5%, and the modulus of elasticity is 4.5%. A theoretical dependence was obtained for predicting the modulus of elasticity of thermoplastic composites in the range of changes in the degree of reinforcement up to 15%. Conclusions. The application of additive technologies based on FDM for 3D printing of thermoplastic composites with increased mechanical properties is substantiated.
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