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Browsing Conference Proceedings and Journals by Author "Abe, T."
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Item A SPHERICAL TEST ARTIFACT TO EVALUATE THREE-DIMENSIONAL FORM ACCURACY FOR WIRE ARC ADDITIVE MANUFACTURING(University of Texas at Austin, 2023) Ko, S.; Sagawa, T.; Yamagata, Y.; Aoki, S.; Abe, T.Additive manufacturing, including the wire arc additive manufacturing (WAAM), is gradually gaining attraction, and providing benefits in the aerospace and construction industries. In both industries, large-scale manufacturing capability and quality consistency of manufactured 3D parts are crucial. As part of quality evaluation, test artifacts for the geometric capability assessment are specified in ISO/ASTM52902-2019(E). On the other hand, the test artifact for curved wall is left undefined. This paper proposes a spherical shell shape as a representative of three-dimensional shapes that are supportless and feature large overhangs, for testing the geometric capability of a WAAM equipment. A mechanical configuration and deposition strategy are considered, which owns the potential to universally applying for depositing large-scale parts. A quality evaluation process for the sphere deposition was also described and experimentally demonstrated.Item Feasibility Study of Large-Sized Aluminum Facades by Using Wire Arc Additive Manufacturing(2022) Yamagata, Y.; Sagawa, T.; Nitawaki, M.; Abe, T.Over the past few years, there has been growing interest in the fabrication of construction components by using wire arc additive manufacturing (WAAM). We focused on the finishing materials as a potential application for WAAM and began to consider fabricating aluminum building facades. However, there are several issues, such as fabrication size of 4-5m, aesthetics, and structural performance. Therefore, a trial fabrication and a non- destructive static loading test were conducted. In the study, an aluminum chair was used as a model because it contains the engineering basis of the building facades. In the trial fabrication, a method of leveling the build surface for each of the multiple layers was found to be effective for large-sized fabrication. Bead blasting was also effective in removing oxides from aluminum surfaces and adjusting the appearance. In the loading test, both displacement and strain measurements agreed well with the FEM analytical values. The results showed that WAAM has the possibility of fabricating large-sized aluminum building facades with the structural performance expected in the FEM analysis.