A crow search algorithm (CSA) was applied to perform the optimization of a running blade prosthetics (RBP) made of composite materials like carbon fibre layers and cores of acrylonitrile butadiene styrene (ABS). Optimization aims to increase the RBP displacement limited by the Tsai-Wu failure criterion. Both displacement and the Tsai-Wu criterion are predicted using artificial neural networks (ANN) trained with a database constructed from finite element method (FEM) simulations. Three different cases are optimized varying the carbon fibre layers orientations: –45°/45°, 0°/90°, and a case with the two-fibre layer orientations intercalated. Five geometric parameters and a number of carbon fibre layers are selected as design parameters. A sensitivity analysis is performed using the Garzon equation. The best balance between displacement and failure criterion was found with fibre layers oriented at 0°/90°. The optimal candidate with –45°/45° orientation presents higher displacement; however, the Tsai-Wu criterion was less than 0.5 and not suitable for RBP design. The case with intercalated fibres presented a minimal displacement being the stiffer RBP design. The damage concentrates mostly in the zone that contacts the ground. The sensitivity study found that the number of layers and width were the most important design parameters.
Los aceros inoxidables austeníticos AISI 316L son muy comunes en la industria. Grandes cantidades de este material se desechan como chatarra y pueden utilizarse posteriormente como material reciclado para la colada. En ambientes marinos (altamente corrosivos), este tipo de acero presenta corrosión intragranular, específicamente en una de sus fases, en la ferrita, por lo que se prefiere mantenerla en la menor proporción posible (1%), pero normalmente se encuentra alrededor del 12%. Si se requiere que una pieza de fundición de acero AISI 316L transporte un fluido presurizado, debe realizarse de acuerdo con las consideraciones descritas en la norma ASTM A351. En este trabajo, se encontró que el acero CF3M tiene mayor solicitud en términos de proporciones químicas elementales de sus componentes. Por lo tanto, se utilizaron los diagramas de Schaeffler y Schoefer para reducir el contenido de "ferrita equivalente" en al menos el 90%, haciendo ajustes en la fundición modificando los porcentajes de Ni y Cr.
Three alloys with different atomic percent (at. %) Cu-Al were designed and synthetized, using an electromagnetic induction furnace system. Alloys were designed in a substitutional way, varying the Al content respect to Cu, from 10 to 50 at. %. Microstructure changes from dendritic structure to equiaxed grains depending the heat treatment. Hardness test evaluation has shown values in the order of 700 kg/mm 2 which represents an increment of 600 percent, while compression tests have shown an important strengthening increment. Besides, electrical resistivity test was carried out, in order to analyze a future application in an electrochemical system, obtaining an improvement three times more in comparison with the unalloyed sample. Strengthening results were interpreted in terms of defects generation, caused by the thermal treatments.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.