Simon Sankare
4 Papers
2 Citations
Simon Sankare is an academic researcher. The author has contributed to research in topics: Layer (electronics) & Ferrite (iron). The author has an hindex of 1, co-authored 3 publications.
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Papers
Microstructure and mechanical behavior of laser additive manufactured AISI 316 stainless steel stringers
TL;DR: In this article, high aspect ratio AISI 316 steel structures made by superposition of sequential layers were made by using a monomode fiber laser to produce high quality steel stringers.
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Interlaced layer thicknesses within single laser powder bed fusion geometries
TL;DR: In this paper, a method is demonstrated for varying layer thickness within single components that allows part sections to be interlaced for the purpose of locally manipulating material and structural properties, and a new design freedom for laser powder bed fusion is created.
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On the use of multiple layer thicknesses within laser powder bed fusion and the effect on mechanical properties
TL;DR: In this article, a method to enable the interlacing of multiple layer thicknesses within one part, allowing for finer layers within regions where they are specifically required, whilst maintaining overall component integrity for specific load cases is presented.
Failure Modes in Dual Layer Thickness Laser Powder Bed Fusion Components Using a Novel Post-Mortem Reconstruction Technique
Abstract: To exploit the design freedoms of Powder Bed Fusion, parameters can be varied within sub-volumes of components to achieve the optimal part for both service conditions and manufacturing productivity. This involves prioritising mechanical strength in areas of structural significance and high volumetric build rates in areas of low structural significance. In theory, a component with similar mechanical behaviour to that seen in standard Laser Powder Bed Fusion parts can be built in significantly less time and at a reduced cost. In practice however, the boundary between such regions is yet to be understood and discretising components into sub-volumes can induce interfacial defects. In this study, an in-depth analysis of interfaces between disparate layer thickness volumes in single components has been explored, to gain information vital to solving interface quality issues so that LPBF design freedoms can be fully exploited. A novel 3D reconstruction technique has been demonstrated to characterise transient plastic behaviour of interfacial pores post-fracture. This technique enables post-mortem evaluation of additively manufactured parts and tracking of pore deformation during subsequent mechanical testing. X-ray Computed Tomography (XCT) identified interfacial pores up to 170 µ m Feret diameter, with a voxel resolution of 6 µ m. Micro tensile testing with in-situ microscopy exhibited a real-time mechanical response, observing evidence that these interfacial defects lead to fracture at interface locations. The 3D reconstruction technique found that pores constricted 10.0 – 14.1% in the x direction and 10.3 – 14.6% in the y direction after fracture – normal to the loading direction. These findings contribute towards improving Additively Manufactured biomedical implants and airframe components with reduced time and cost.