Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Effects of the printing parameters on the shape memory effects on 3D printed polylactic acid (PLA)
Submission Author:
Brenno Tavares Duarte , RJ
Co-Authors:
Brenno Tavares Duarte, Ricardo Alexandre Amar de Aguiar, Pedro Manuel Calas Lopes Pacheco
Presenter: Brenno Tavares Duarte
doi://10.26678/ABCM.COBEM2023.COB2023-0997
Abstract
Due its ability to manufacture complex structures, additive manufacturing has gained significant attention in the past decade. Particularly in the fields of prototyping; manufacturing customized parts; prosthetics and others medical applications; aerospace and automotive industries. Another exciting development on the field is four dimensional printing (4D printing), this process allows the 3D printed material to transform to a pre-programmed shape or return to its original design given specific stimuli. This shape morphing properties are achieved through an appropriate material selection and printing conditions. To better understand and apply these shape memory polymers, several thermomechanical constitutive models have been developed over the past two decades. Fused deposition modeling (FDM), one of the most used 3D printing methods, allows for precise layer -by-layer deposition, which can affect the mechanical properties of the final product. The frequently used raw material polylactic acid (PLA) is an interesting material for 4D printing as it is a biodegradable polymer with thermo-activated shape memory behavior that allows it to be applied in a broad range of smart structures. This study aims to investigate the mechanical properties and shape memory effect of PLA polymer and the effects of the layer deposition direction on these properties. However, there is a lack of models capable of reproducing the shape memory effect in PLA polymers, these results are introduced on one constitutive model. The Tobushi model (2001), a viscoelastic model with slip conditions that the material properties are a function of the temperature. Numerical results are compared with experimental data obtained from PLA specimens to assess the applicability of these model to PLA components. These results can contribute to better geometry and printing parameters selection for controlling the mechanical properties and range of shape memory effect.
Keywords
Constitutive modeling, polylactic acid, Impressão 4D, FDM 3D Printing Process
