Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Residual thermal stress in fused deposition modelling
Submission Author:
Rafael Quelho de Macedo , SP
Co-Authors:
Rafael Thiago Luiz Ferreira, Rafael Quelho de Macedo
Presenter: Rafael Quelho de Macedo
doi://10.26678/ABCM.COBEM2017.COB17-0124
Abstract
In this work, it is presented a model that simulates the process of FDM (Fused Deposition Modelling) capable of calculating temperature gradients and stresses (induced by the changes in temperature) during and after the filament deposition using FEM (finite element method). The stresses calculated vary in time during the printing process because the temperature is also changing, however stresses remain in the final printed part (residual thermal stress). It is shown that the intensity of those stresses are highly related to the rate of temperature changes during the printing process: the stresses are higher if the temperatures of the printed part vary rapidly. Those stresses can cause delamination during the deposition process and the residual thermal stresses can cause an offset to the failure envelope of the printed part. It is also shown that if the temperature of the 3D printer chamber is high, the printed part is subject to low temperature gradients during the printing process causing stresses of less intensity. This model helps to explain printed parts warping, their failure (delamination) during and after the printing process.
Keywords
3D printing, residual thermal stress, delamination, ABS
