Abstract
We used finite element analyses (FEA) on Abaqus to study flexural properties of additive manufactured beams using polylactic acid (PLA) polymer. Experimental stress–strain data from flexural testing are used to define elastic–plastic properties of the material in the computation software. The flexural experiments are used to validate the FEA approach suggested. The method provides good results of deflection and stress with errors well below 10% in most of the cases. Therefore, by using the proposed approach, costs related to repeated experimental works can be avoided. In addition, the flexural rigidities of the additive manufactured beams are studied. Five different beam stiffener designs (diamond, honeycomb, square, triangular and wiggle) are studied based on beam bending theory. The force–deflection data from the flexural tests are used to determine the area moments of inertia of the beams. The honeycomb stiffener showed the highest force–deflection behaviour that led to the highest calculated area moment of inertia. However, with the lowest force–deflection behaviour, the square stiffener had the lowest calculated area moment of inertia.
Highlights
The additive manufacturing (AM) is the state-of-the-art technology that changed the conventional approach to manufacturing systems
This paper investigates the flexural properties of 3D printed polylactic acid (PLA) beams
The objective of this paper is to study the force–deflection behaviours of five different beam stiffener designs under flexural loading
Summary
The additive manufacturing (AM) is the state-of-the-art technology that changed the conventional approach to manufacturing systems. It is defined as fabricating a 3D model directly from computer aided design (CAD) software without process planning [1]. It simplified the complexity of manufacturing difficult component geometries. The additive manufactured products are susceptible to process related flaws including pores, surface roughness and geometric deviations from nominal dimensions [2]. Several papers discuss influences of 3D printing parameters on structural rigidity of additive manufactured components
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