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Indexed at: search.filters.indexed.ScopusSubject: search.filters.subject.Additive manufacturing

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    Additive manufacturing with modular support structures
    (The University of Texas at Austin, 2020) Department of Mechanical Engineering; Department of Mechanical Engineering; N/A; Lazoğlu, İsmail; Isa, Mohammed A.; Yiğit, İsmail Enes; Faculty Member; Researcher; Phd Student; Department of Mechanical Engineering; College of Engineering; College of Engineering; Graduate School of Sciences and Engineering; 179391; N/A; N/A
    Additive manufacturing is praised to have low material waste compared to conventional subtractive manufacturing methods. This is not always the case when the computer aided design (CAD) model consists of large overhangs. In such cases, fabrication of support structures are required to fill the space between the CAD model and the manufacturing bed. In post processing, these support structures must be removed from the model. These supports become waste and reduce the buy-to-fly ratio. In this paper, we present a pre-fabricated reusable modular support structure system which minimizes the fabrication of conventional support structures. The conventional supports are replaced with modular support blocks wherever possible. The blocks are stacked under the overhang with a robot arm until the overhang of the model is reached. Conventional supports can be fabricated on top when needed with fused filament fabrication. This strategy reduces fabrication of conventional supports. Thus, faster fabrication times are obtained with higher buy-to-fly ratios.
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    Analysis of build direction in deposition-based additive manufacturing of overhang structures
    (The University of Texas at Austin, 2020) Department of Mechanical Engineering; Department of Mechanical Engineering; N/A; Lazoğlu, İsmail; Isa, Mohammed A.; Yiğit, İsmail Enes; Faculty Member; Researcher; Phd Student; Department of Mechanical Engineering; College of Engineering; College of Engineering; Graduate School of Sciences and Engineering; 179391; N/A; N/A
    Additive manufacturing (AM) has gained repute as a direct method of fabrication of complex parts. However, the requirement for each layer to be structurally supported can make parts with overhangs hard to produce without alterations to the parts. This work proposes using multi-axis additive manufacturing to fabricate and analyze freeform overhangs such as bridge structures. Multi-axis AM allows reorientation of the build direction so that overhangs can be 3D printed. Consequently, decision on the build orientation is necessary and its result should be analyzed. The effect of the AM build direction with respect to the overhang's local surface directions will be studied. A Rhinoceros® plugin is designed to generate the path of the multi-axis AM for the unsupported components like roofs, bridges and protrusions. The effects of the build direction on the surface quality and deformation of the components are studied.