The material flow mechanism affects the printing quality considerably in 3D cementitious material printing (3DCMP) area. A numerical model was developed to investigate the material flow mechanism during the extrusion and deposition process. To quantify the effects of flow mechanism on the filament printing quality, deformation of the printed filament was proposed. Then a Support Vector Machine (SVM) was employed to study various factors on flow mechanism, hence the deformation of the printed filament. The SVM model results showed that deformation of the printed filament is independent of plastic viscosity, however, material yield stress and relative nozzle travel speed significantly affect the deformation of the printed filament. Lastly, an empirical parametric associative model was proposed to predict the filament deformation based on material yield stress and relative nozzle travel speed.

在3D胶凝材料打印（3DCMP）区域中，材料流动机制会显着影响打印质量。建立了一个数值模型来研究挤压和沉积过程中的材料流动机理。为了量化流动机理对长丝印刷质量的影响，提出了印刷长丝的变形。然后使用支持向量机（SVM）研究流动机理的各种因素，从而研究印刷长丝的变形。SVM模型结果表明，印刷长丝的变形与塑性粘度无关，但是，材料屈服应力和相对喷嘴行进速度会显着影响印刷长丝的变形。最后，