Exit morphology and mechanical property of FDM printed PLA: influence of hot melt extrusion process  

作　　者：Yan-Hua Bian Gang Yu Xin Zhao Shao-Xia Li Xiu-Li He Chong-Xin Tian Zhi-Yong Li 

机构地区：[1]Institute of Mechanics,Chinese Academy of Sciences,Beijing,100190,People’s Republic of China [2]School of Engineering Science,University of Chinese Academy of Sciences,Beijing,100049,People’s Republic of China [3]Research Institute of 3D Printing,Beijing City University,Beijing,100083,People’s Republic of China [4]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,100049,People’s Republic of China

出　　处：《Advances in Manufacturing》2023年第1期56-74,共19页先进制造进展（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.11502269 and 11672304);plan of Beijing Municipal Commission of Science and Technology(Grant No.Z181100003818015).

摘　　要：In order to study the hot melt extrusion process in fused deposition modeling(FDM),this study mainly explores the effects of printing temperature,heated block length,feeding speed on the exit morphology and mechanical properties of FDM printed Polylactic acid(PLA)samples.High-speed camera is used to capture the exit morphology of molten PLA just extruded to the nozzle.According to exit morphology,the outlet states of extruded molten material can be divided into four categories,namely,bubbled state,coherent state,expanding state,and unstable state.Tensile test results show that printing temperature,heated block length and printing speed have significant influence on tensile properties and fracture mode of FDM printed samples.When the heated block length is 15 mm and 30 mm,there is a ductile-brittle transition in fracture mode with the increase of printing speed.The printing process window under different heated block lengths and printing temperatures has been figured out and the distribution of printing process window under different printing speeds has been discussed.There is a maximum printing process window under the heated block length of 30 mm.This finding provides a frame work for performance prediction of FDM printed parts and theoretical guidance for expanding the scope of printing process window.

关 键 词：Fused deposition modeling(FDM) Polylactic acid(PLA) Exit morphology Tensile property Printing process window 

分 类 号：O3[理学—力学]