The aim of this study is to analysis the tensile deformation behavior of 3D printed unidirectional continuous fiber reinforced thermos-plastic composites (UD-CFRTP). Tensile experiments were performed to obtain the deformation curves and tensile properties of composites specimens. It is found that the reinforcement fiber bundles of specimens bearing the load non-synchronously. Meanwhile, with the fiber content change, the deformation form could be different. An improved micromechanical model was proposed to investigate the influence of non-synchronous phenomenon and fiber content on the deformation behavior. The fiber content is measured by the number of reinforcement fiber bundles instead of fiber volume fraction in this model. Based on this model, the deformation behavior and tensile properties of test specimens with different fiber bundles number were analyzed in detail. The analytical results about deformation behavior and tensile properties show a good agreement with experiment results.

这项研究的目的是分析3D打印的单向连续纤维增强热塑性塑料复合材料（UD-CFRTP）的拉伸变形行为。进行拉伸实验以获得复合材料样品的变形曲线和拉伸性能。发现试样的增强纤维束不同步地承受载荷。同时，随着纤维含量的变化，变形形式可能会有所不同。提出了一种改进的微力学模型来研究非同步现象和纤维含量对变形行为的影响。在此模型中，纤维含量是通过增强纤维束的数量而不是纤维体积分数来测量的。基于此模型，详细分析了不同纤维束数的试样的变形行为和拉伸性能。变形行为和拉伸性能的分析结果与实验结果吻合良好。