Browsing by Author "Yavari, A. R."
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Item Open Access Mechanically induced waves in metallic glass foils(Elsevier, 2015-10-29) Panagiotopoulos, N. T.; Yousfi, M. A.; Georgarakis, Konstantinos; Yavari, A. R.The response of vitrified metallic arc foils under normal load is studied. Application of normal load on an initial arc shaped vitrified metallic foil is followed by multiplication of the initial arc. A sinusoidal mathematical expression can be used for the description of the produced harmonic undulations. The number of the formed waves increases as the displacement increases. Therefore, this undulatory behavior of the vitrified foils can be exploited as a flat spring with multiple spring constants. For comparison crystalline foils were tested. The enormous elastic region of vitrified alloys allows this undulatory response to occur extensively while plastic deformation is unavoidable when crystalline foils are used. Exploiting the metallic glass characteristics, the predefined extrem a positions of the formed undulations and the mechanical characteristics of the vitrified foils a new type of electromechanical switch is suggested. (c) 2015 Elsevier Ltd. All rightsItem Open Access Novel micro-flat springs using the superior elastic properties of metallic glass foils(Elsevier, 2017-01-23) Yousfi, M. A.; Panagiotopoulos, N. T.; Jorge Junior, A. M.; Georgarakis, Konstantinos; Yavari, A. R.A thin metallic glass foil of 100 mg mass forming a sinusoidal arc behaves as non-conventional flat micro-spring withstanding loads 105 times higher than its load. Upon a normal load applied on the top of the arc, the foil deforms elastically leading to sinusoidal wavy patterns of higher order. The lifespan of the novel spring is higher than conventional low cycle springs and can potentially be further improved by eliminating surface and edge preparation induced defects. This unique behavior of metallic glass foils has the potential to revolutionize the field of springs and can be exploited for numerous applications.