Browsing by Subject "conventional manufacturing"

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Design, Fabrication and Evaluation of Negative Stiffness Elements
(University of Texas at Austin, 2009-09) Kashdan, Lia; Seepersad, Carolyn; Haberman, Michael; Wilson, Preston S.
Recent research has shown that constrained bistable structures can display negative stiffness behavior and provide extremal vibrational and acoustical absorptive capacity. These bistable structures are therefore compelling candidates for constructing new metamaterials for noise reduction, anechoic coatings, and backing materials for broadband imaging transducers. To date, demonstrations of these capabilities have been primarily theoretical, because the geometry of bistable elements is difficult to construct and refine with conventional manufacturing methods and materials. The objective of this research is to exploit the geometric design freedoms provided by selective laser sintering (SLS) technology to design and construct constrained bistable structures with negative stiffness behavior. The static and dynamic behaviors of resulting bistable structures are experimentally investigated. Initial bistable designs and test results are presented in this paper.
Examination of the Connection Between Selective Laser-Melted Components of 316L Steel Powder on Conventionally Fabricated Base Bodies
(University of Texas at Austin, 2018) Link, Martin; Haefele, Tobias; Abele, Eberhard
The advantages of selective laser melting lie in the production of complex, small components in small batches. For large-volume components, the use of additive manufacturing (AM) processes is limited by the available installation space, low build rates, and high material costs. For the production of large and less complex workpieces, conventional manufacturing processes such as milling are more economical. The background of this study was to combine both processes to decrease manufacturing times. For this purpose, a body made of 316L (1.4404) steel powder was printed using selective laser melting on conventionally manufactured stainless-steel base bodies. The use of multi-materials enables optimized machinability in the respective manufacturing process. This paper examines the hardness properties of multi-material samples and uses micrographs to analyze the microstructure of their connection area. A complete connection between hybrid components made of comparable materials was determined.
Method for the Evaluation of Economic Efficiency of Additive and Conventional Manufacturing
(University of Texas at Austin, 2017) Auth, C.; Arndt, A.; Anderl, R.
The advantages of individuality and complexity for free are commonly known in the field of additive manufacturing, but, nevertheless, they compete with advantages of conventional manufacturing methods. On the one hand, a small size production can be economically viable through additive manufacturing. On the other hand, conventional manufacturing methods are well known and optimized, so that they have low cost per unit. Therefore, to evaluate the economic efficiency various criteria are needed to compare additive and conventional manufacturing methods. In the following part comparative criteria and influence factors for economic efficiency are identified and described. Besides general aspects personal reasons may influence a manufacturing decision. Therefore, the identified criteria are used to build a method which helps the user to decide on a manufacturing method depending on personal preferences. The structure and use of this method is described in the second part. After this, an outlook and conclusion is given.