具有内部孔洞的3D打印PLA试样力学性能研究  

Study on Mechanical Properties of 3D Printing PLA Specimens with Inner Hole

作　　者：董骏杰 刘宇杰[1] DONG Junjie;LIU Yujie(School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]西南交通大学力学与工程学院,成都610031

出　　处：《四川理工学院学报（自然科学版）》2018年第2期50-54,共5页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

摘　　要：结构内部的孔洞、夹杂等缺陷是引起构件破坏的重要原因,为研究材料内部孔洞对其力学性能的影响。本文利用3D打印设备,使用PLA(聚乳酸)材料,制备得到含有不同尺寸的球形和椭球形孔洞的试样,在MTS疲劳试验机上开展拉伸试验,研究了3D打印材料内部孔洞对构件力学性能的影响。结果表明,小尺寸孔洞能增加3D打印试样的拉伸强度和刚度。球形孔洞对构件在单轴拉伸时的断裂形式有显著的影响,随着孔洞体积的增加,构件的拉伸强度和拉伸强度应变呈逐渐减小的趋势;在体积分数相同时,球形孔洞的对构件力学性能的影响大于椭球形孔洞。The internal pores, inclusions and other defects are one of the causes for damage failure of components. In this paper, the 3 D printing PLA （Polylactie Acid） specimen with different sizes of spherical and ellipsoidal holes was pre- pared. Then, tensile experiments were performed to study the influence of holes on mechanical properties of 3 D printing specimens by MTS test machine. The results show that the specimens with small size hole have higher tensile strength and stiffness compared with specimens without hole. The spherical holes have significant influence on the fracture form for tensile speci- mens. With the increasing of hole volume, the tensile strength of specimens decrease gradually. For the same hole volume, the influence of spherical holes on mechanical properties is greater than that of ellipsoidal holes

关 键 词：3D打印 内部孔洞 拉伸试验 力学性能 

分 类 号：TB32[一般工业技术—材料科学与工程]