4.7 Article

Analysis of prospective SIF and shielding effect for cylindrical rough surfaces obtained by L-PBF

期刊

ENGINEERING FRACTURE MECHANICS
卷 256, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2021.107983

关键词

AlSi10Mg; Computed tomography; Additive manufacturing; Surface roughness; Shielding; FEA

资金

  1. MIUR-Italian Ministry for Education, University and Research through the Department of Excellence project LIS4.0 (Lightweight and Smart Structures for Industry 4.0)

向作者/读者索取更多资源

Fatigue properties of parts built by Additive Manufacturing are influenced by process induced defects and complex surface morphology, with surface valleys and micro-notches acting as crack initiation sites. This study aims to understand how the surface complexity of L-PBF AlSi10Mg specimens in as-built condition affects fatigue behavior, with results indicating that traditional shielding factor can predict average geometric factor value for surface notches in L-PBF surfaces.
Fatigue properties of parts built by Additive Manufacturing (AM) are strictly related to process induced defects and complex surface morphology. Several studies have proved that surface valleys act as crack initiation sites, similarly to surface micro-notches. However, different roughness parameters have been considered in literature for the depth of the surface notches, together with the adoption of a shielding factor. The aim of this study is to understand how the surface complexity of L-PBF (Laser-Powder Bed Fusion) AlSi10Mg cylindrical specimens in as-built condition can affect the fatigue behaviour. In detail, CT (Computer Tomography) scans were adopted to characterize the surface quality and 2D FE (Finite Element) analyses were used to calculate the local stress intensity factor at the most critical valleys in the surface. The results of the FE analyses were compared with a shielding factor determined for regularly spaced notches. In spite of the significant scatter, the average geometric factor value for surface notches in L-PBF surfaces is correctly predicted by the traditional shielding factor.

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