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• W4210670473 abstract "Abstract Fabrication of prototypes and custom-made parts, made of various metals, has become possible by additive manufacturing. Like any new technology, reliability of the products is of utmost importance, especially, when it comes to life-sustaining structures or for applications where human life is at stake. A less common method of making 3D metallic object is by 3D welding. This method is more appropriate for structures where dimensional and esthetic characteristics of the structures are of secondary importance. An example is steel rebar in concrete where it requires rough corrugated surfaces of the rebars. This walled metallic structures, used especially for loadbearing applications, where load is not fixed will require investigation of fatigue properties. Conventional testing methods may not be appropriate for small cross sections. To address this problem, microtensile testing allows characterization of mechanical properties of small structures as thin as a few millimeters. Past work on the monotonic and cyclic properties of microsamples extracted from weldments made on metallic substrates has shown superior tensile strength and enhanced fatigue resistance compared to the base metal. It is interesting to see how the results would be different if ceramic substrates were used. This study utilizes a gantry type 3D printer, equipped with the gun of a MIG welding machine to fabricate steel weldments on ceramics using 3D welding technique. The process involves starting of the arc from a grounded piece of metal, then continue the motion of the gun and guide the motion of the molten metal pool in desired direction, maintaining the continuity through the solidifying bead. Weldment samples fabricated by this technique are then machined by a CNC mill to extract microscale dog-bone-shaped samples with a width of 200 micron and a gage length of 1000 micron. The top and bottom surfaces of the samples are polished to a mirror finish and subsequently the microsamples are mounted in the grippers of an Electropulse 1000 Instron load frame. Monotonic and cyclic loading mechanical tests in tensile mode are conducted and data are collected and plotted in terms of stress-strain as well as stress-life curves. These results are then compared with those of samples made by 3D welding of steel-on-steel substrate. Since the cooling rate of molten metal on steel substrates differs from that of ceramic substrate, fatigue properties may be different too. The implications of the reliability of reinforcement steel bars printed by 3D welding will be discussed." @default.
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• W4210670473 date "2021-11-01" @default.
• W4210670473 modified "2023-09-29" @default.
• W4210670473 title "On the Fatigue Properties of 3D Steel Structures Welded Onto Ceramics" @default.
• W4210670473 doi "https://doi.org/10.1115/imece2021-72572" @default.
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