Influence Of Orthogonal Lamination On The Mechanical Properties Of FDM 3D-printed ABS Structures

Fused Deposition Molding(FDM),as one of the most widely used 3D printing technology,has many the advantages of simple equipment and low cost.FDM technology not only be used to product the prototypes,but can form various functional parts.Therefore,the mechanical behavior of FDM 3D printing components has become an important research task.In this study,acrylonitrile-butadiene-styrene(ABS)was selected as the printing material,and the orthogonal lamination forming strategy was adopted to prepare FDM parts with different lamination angles in FDM printing technology.The effects of lamination angle(molding Angle)and strain rate on mechanical properties of FDM parts were studied through the experiments,laminated plate theory,and numerical simulation.Specific research contents and the results obtained are as follows:1.Three single-layer specimens with 0°,45° and 90° of ply angle and four orthogonal ply FDM specimens with 0°/90°,15°/-75°,30°/-60° and 45°/-45°were prepared by FDM 3D printing technology.The effects of angles and strain rates on mechanical behavior were studied,and the failure mechanism of orthogonal laminated FDM specimens was revealed.Results show that the elastic modulus is insensitive to forming angle for tension tests,but the elastic modulus decreases with increasing of the forming angle for compression tests.The tensile strength arrive at maximum when the forming angle is 45°,but the compressive properties is preferably when the forming angle is 0°.The tensile and compressive properties of orthogonally laminated specimens increase with loading rate,and are approximately linear with the increasing of natural logarithm of strain rate.2.The stress-strain relationship of single-layer and orthogonal laminated FDM parts were studied according to the classical laminate theory due to the characteristics of layer-by-layer accumulation of orthogonal laminated FDM parts.The theoretical model of mechanical properties of orthogonal laminatedFDM specimens was established and compared with the experimental results.Results show that the theoretical model can be used to predict the mechanical properties of orthogonal laminated FDM specimens,and the errors between theoretical calculations and experimental results may be caused by molding thermal stress,interlayer and interstitial voids.3.The finite element analysis software ABAQUS was used to stady the tensile process of orthogonal laminated FDM specimens.The deformation of orthogonal laminated FDM specimens were obtained during tensile process,and the influence of lamination angle and strain rates on the tensile process of FDM specimens were revealed.Results show that the specimens exhibit anisotropy(macro-isotropy),and the mechanical properties and tensile cross-section angle are affected greatly by lamination angles.The numerical simulation results were basically consistent with experimental results.