摘要
以PLA型3D打印材料为研究对象,通过3D成型的方式制备出拉伸和扭转试验样本,测定了该材料的弹性力学性能。并通过扩展有限元法(XFEM)进行了样本的拉伸断裂性能计算。为评估PLA材料在3D打印件的应用领域提供了相应的断裂参数,同时也为改善3D打印材料力学特性提供了依据。研究结果表明,PLA型3D打印件弹性本构为横贯各向异性;最大拉伸应力为20MPa,拉伸过程中出现的两条裂纹都是以I型和III型裂纹为主,裂纹尖端应力奇异最大值为1.9GPa。
The article focuses on the PLA material of 3Dprinting.The test specimens of the stretching and the torsion test were prepared by means of 3Dprinting.In addition,the tension failure properties of the specimen were calculated using extended finite element method（XFEM）,which provides the fracture parameters for assessment of PLA 3Dprinting pieces,and also offers the basis in improving mechanical properties of 3Dprinting materials.The results show that the constitutive model of PLA 3Dprinting material is transverse anisotropy,the maximum tensile stress is 20 MPa,two cracks which formed in tension process are mainly I and III,and the maximum value of crack tip stress singularity is 1.9GPa.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2016年第2期136-142,共7页
Journal of Plasticity Engineering
基金
江西省科学院协同创新计划资助项目(014-YYB-170)
