Discrete element method model calibration and validation for the spreading step of the powder bed fusion process to predict the quality of the layer surface  

作　　者：Marco Lupo Sina Zinatlou Ajabshir Daniele Sofia Diego Barletta Massimo Poletto 

机构地区：[1]Department of Industrial Engineering,University of Salerno,Via Giovanni Paolo II,132,84084,Fisciano,SA,Italy [2]Granutools,Rue Jean Lambert Defrene 107,4340 Awans,Belgium [3]Dipartimento di Ingegneria Informatica,Modellistica,Elettronica e Sistemistica dell’Universita’della Calabria,Via Pietro Bucci,87036 Rende CS(CS),Italy

出　　处：《Particuology》2024年第11期261-273,共13页颗粒学报（英文版）

基　　金：supported by MATHEGRAM.Marie SKŁODOWSKA-CURIE Innovative training network MATHEGRAM is funded through the People Programme(Marie SKŁODOWSKACURIE Actions)of the European Union’s Horizon 2020 Programme H2020 under REA grant agreement No.813202.

摘　　要：A Discrete Element Method model,including interparticle cohesive forces,was calibrated and validated to develop a tool to predict the powder layer’s quality in the powder bed fusion process.An elastic contact model was used to describe cohesive interparticle interactions.The surface energy of the model particles was estimated by assuming that the pull-off force should provide the strength of the material evaluated at low consolidation with shear test experiments.The particle rolling friction was calibrated considering the bulk density of the layer produced by the spreading tool.The model was validated with the experiments by comparing the wavelet power spectra obtained with the simulations with those of the experimental layers illuminated by grazing light.The calibration proposed in this study demonstrated superior performance compared to our previous methods,which relied on measuring the angle of repose and unconfined yield strength.

关 键 词：Additive manufacturing Powder bed fusion Laser sintering Powder spreading Discrete element method Wavelet transform 

分 类 号：TG14[一般工业技术—材料科学与工程]