پديدآورندگان :
Sedighi I School of Mechanical Engineering, Iran University of Science and Technology, Narmak 16846, Tehran, Iran , Ayatollahi M. R m.ayat@iust.ac.ir School of Mechanical Engineering, Iran University of Science and Technology, Narmak 16846, Tehran, Iran , Bahrami B School of Mechanical Engineering, Iran University of Science and Technology, Narmak 16846, Tehran, Iran , Pérez Martínez M. A Grup d’Enginyeria de Productes Industrials, IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain , Garcia-Granada A. A Grup d’Enginyeria de Productes Industrials, IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
كليدواژه :
Additive manufacturing , Mode I fracture toughness , Raster angle , Semi , circular bend specimen
چكيده فارسي :
Additive manufacturing technologies have become widely popular in the last few decades. Since additive manufacturing (AM) is a relatively new technique, there is a lack of data on the mechanical properties of parts produced using this method. Moreover, due to the nature of AM, parts built by this process are prone to defects. Therefore, it is necessary to study the fracture behavior of 3d-printed parts and obtain their fracture toughness. In order to do so, mode I semi-circular bend (SCB) specimens are fabricated from poly-carbonate using fused deposition modelling. The SCB specimens are printed in the direction of the width of the geometry. Four different raster angles are used to investigate the effect of orientation on the fracture toughness of the printed parts. A total of 12 mode I fracture tests are conducted using a three-point bending setup. It is observed that the raster orientation affects the fracture toughness of the 3d-printed parts up to 40 percent. More specifically, the (0/90) and (45/-45) raster orientations have the lowest and highest resistance to crack initiation, respectively.
