Constitutive relation development for FDM 3D printing materials and simulation of printing direction combination

IF 2.6 4区 工程技术 Q2 MECHANICS
Meng Li, B. Sun
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引用次数: 0

Abstract

Due to the forming or curing process, the materials of three-dimensional (3D) printing have periodic mesodefects, which result in complex constitutive relations and anisotropy. Fused deposition modeling (FDM), which is a typical 3D printing process, inevitably introduces stacking pore defects due to the three-dimensional stacking of materials along the printing direction. At present, research focuses on the mechanical properties of materials printed along only one single direction. To consider the possibility of changing the mechanical properties of materials by adjusting the printing direction, the change in the properties of printing materials along the multiple printing direction combinations was analyzed in this paper. First, based on a continuous medium model, the constitutive model proposed by Garzon-Hernandez et al. was considered, and then to improve the prediction accuracy of the model in the plastic stage, a model describing the porosity change rate of porous materials was introduced to obtain better prediction results. Then, the finite element method (FEM) was developed using the new constitutive relation model implemented by the User Defined Material subroutine (USERMAT) into ANSYS software. Second, through the finite element subroutine, the mechanical response of the FDM 3D printing plate with two different printing direction combinations was simulated. The results show that by adjusting the print direction combination of the double-layer FDM 3D printing materials, the materials show a different anisotropy, maximum bearing capacity of tension and shear and buckling resistance
FDM 3D打印材料本构关系发展及打印方向组合仿真
由于成型或固化过程,三维打印材料具有周期性的介电缺陷,导致了复杂的本构关系和各向异性。熔融沉积建模(FDM)是一种典型的3D打印工艺,由于材料沿打印方向的三维堆叠,不可避免地会引入堆叠孔隙缺陷。目前,研究的重点是沿单一方向印刷的材料的力学性能。为了考虑通过调整印刷方向改变材料力学性能的可能性,本文分析了印刷材料沿多个印刷方向组合的性能变化。首先,在连续介质模型的基础上,考虑了Garzon Hernandez等人提出的本构模型,然后为了提高模型在塑性阶段的预测精度,引入了描述多孔材料孔隙率变化率的模型,以获得更好的预测结果。然后,利用用户定义材料子程序USERMAT在ANSYS软件中实现的新的本构关系模型,开发了有限元法。其次,通过有限元子程序,模拟了FDM 3D打印板在两种不同打印方向组合下的力学响应。结果表明,通过调整双层FDM 3D打印材料的打印方向组合,材料表现出不同的各向异性、最大拉剪承载力和抗屈曲性能
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来源期刊
CiteScore
4.80
自引率
3.80%
发文量
95
审稿时长
5.8 months
期刊介绍: All areas of theoretical and applied mechanics including, but not limited to: Aerodynamics; Aeroelasticity; Biomechanics; Boundary layers; Composite materials; Computational mechanics; Constitutive modeling of materials; Dynamics; Elasticity; Experimental mechanics; Flow and fracture; Heat transport in fluid flows; Hydraulics; Impact; Internal flow; Mechanical properties of materials; Mechanics of shocks; Micromechanics; Nanomechanics; Plasticity; Stress analysis; Structures; Thermodynamics of materials and in flowing fluids; Thermo-mechanics; Turbulence; Vibration; Wave propagation
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