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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。
Taking PLA 3D printing material as the research object, the tensile and torsion test specimens were prepared by 3D molding, and the elastic mechanical properties of the material were measured. The tensile fracture behavior of the samples was calculated by the extended finite element method (XFEM). In order to evaluate the application of PLA materials in 3D printing applications, the corresponding fracture parameters are provided, which also provide a basis for improving the mechanical properties of 3D printed materials. The results show that the elastic constitutive of PLA 3D printing is transaxial anisotropy. The maximum tensile stress is 20MPa. The two cracks in the drawing process are mainly type I and type III cracks, and the crack tip stress is singular The maximum value is 1.9 GPa.