摘要
熔融沉积技术(Fused Deposition Modeling,FDM)具有成型速度快、操作简单等优点。打印速度、打印层厚、打印温度等会影响制件的等效应力,进而影响其力学性能。不同于直接将打印温度设置为生死单元仿真的初始温度,通过实验与流体仿真验证,得出的单道熔丝接触底板时的温度,作为生死单元多层叠加时的初始温度,计算并拟合出关于打印参数的换热系数函数,使仿真的温度变化和应力更加精确。再通过FDM多层堆叠仿真,得出不同参数下的成型件应力大小,与相同参数下拉伸试验得到的拉伸强度进行关联对比,从应力大小的角度,分析打印参数对拉伸强度影响。设计补充试验,得出打印层厚尽量小、打印速度适中、打印温度适中时,聚乳酸(Ploylactic Acid,PLA)成型件拉伸强度最大。
Fused Deposition Modeling(FDM)has the advantages of fast forming speed and simple operation.Printing speed,printing layer thickness and printing temperature affect the equivalent stress of the workpieces,and then affect its mechanical properties.It is different from direct setting printing temperature as the initial temperature in the birth and death unit simulation.Through experiment and fluid simulation,the temperature of the single fuse when it contacts the plate is got,as the initial temperature of the multilayer superposition simulation.We calculate and fit out the function of heat transfer coefficient,considering printing parameters.With the FDM Multi Layer Stacking simulation,the stress of the workpieces under different parameters is got.Then correlated and compared with the tensile strength obtained by the tensile test under the same parameters.From the point of the stress,we analyzed the influence of the printing parameters on the tensile strength.The supplementary experiment is designed,and find the tensile strength of ploylactic acid(PLA)workpieces reach the maximum when the printing layer thickness is as far as small,the printing speed and the printing temperature are appropriate.
作者
成国峰
丁子珊
CHENG GuoFeng;DING ZiShan(College of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《机械强度》
CAS
CSCD
北大核心
2023年第5期1211-1220,共10页
Journal of Mechanical Strength
基金
国家自然科学基金项目(52105470)资助。
关键词
FDM
等效应力
换热系数
拉伸强度
FDM
Equivalent stress
Heat transfer coefficient
Tensile strength
