熔丝成型薄板拉伸性能的理论与实验研究

Theoretical and Experimental Study on Tensile Properties of Fused Filament Fabrication Thin Plates

由于熔丝成型(fused filament fabrication, FFF)技术逐层沉积的制造工艺特点,其产品的拉伸性能存在着明显的局限性.为了能够提出切实有效的改进措施,需要明确FFF产品相应的机理,即建立本构关系理论模型.基于经典弹性力学理论,对FFF薄板试件的本构关系进行了理论建模,完成了试件拉伸性能的解析研究;然后利用拉伸实验机获得了试件拉伸性能的实验结果;最后,分别将X和Z方向打印试件的理论与实验的应力-应变曲线结果相对比,发现二者吻合度较好,验证了理论模型的正确性与准确性.

Due to the manufacturing layer-by-layer deposition process of the fused filament fabrication(FFF) technology, the tensile properties of the products have obvious limitations. In order to put forward effective improvement measures, the corresponding mechanism of FFF products should be clarified, that is, establishing theoretical constitutive model. Based on the classical elastic mechanics theory, the constitutive model of FFF thin plate samples is set up, and the theoretical analysis on the tensile properties of the samples are completed. Then, the experimental tensile properties of the samples were obtained by using the tensile testing machine.Finally, by comparing the theoretical and experimental results of stress-strain curves of the samples built in both X and Z direction, it is shown that they are in good consistence, verifying the correctness and accuracy of the theoretical model.