Experimental Study on the Propulsion Performance of the M-shape flapping wing’s bending angle

Chen, Jingxian; Nie, Xu; Ximing, Zhou

doi:10.1088/1742-6596/916/1/012004

Cited by 2 publications

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“…A combination of both types of gradation in the structure can be used to alternatively increase or decrease stiffness and therefore a pathway to tailor the elasticity of a cantilever beam relatively easily. These results give rise to an architected framework for designing and optimizing the topography of leveraged solids.Cantilevered beams arise in a number of diverse engineering applications spanning an enormous variety of length scales [1,2,3,4,5,6,7,8,9,10]. In several of these applications, tailoring elasticity can be of tremendous significance since it can be used to design the response according to stimulus or guard against unwanted instabilities.To this end, functional gradation (FG) is a useful strategy.…”

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Tailorable elasticity of cantilever using spatio-angular functionally graded biomimetic scales

2019

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Cantilevered beams are of immense importance as structural and sensorial members for a number of applications. Endowing tailorable elasticity can have wide ranging engineering ramification. Such tailorability could be possible using some type of spatial gradation in the beams material or cross section. However, these often require extensive additive and subtractive material processing or specialized casts. In this letter, we demonstrate an alternative bio inspired mechanical pathway, which is based on exploiting the nonlinearity that would arise from a functionally graded distribution of biomimetic scales on the surface using an analytical approach. This functional gradation is geometrically sourced and could arise from either spatial or angular gradation of scales. We analyze such a functionally graded cantilever beam under uniform loading. In comparison with uniformly distributed scales, we find significant differences in bending stiffness for both spatial and angular gradations. Spatial and angular functional gradation share some universality but also sharp contrasts in their effect on the underlying beam. A combination of both types of gradation in the structure can be used to alternatively increase or decrease stiffness and therefore a pathway to tailor the elasticity of a cantilever beam relatively easily. These results give rise to an architected framework for designing and optimizing the topography of leveraged solids.Cantilevered beams arise in a number of diverse engineering applications spanning an enormous variety of length scales [1,2,3,4,5,6,7,8,9,10]. In several of these applications, tailoring elasticity can be of tremendous significance since it can be used to design the response according to stimulus or guard against unwanted instabilities.To this end, functional gradation (FG) is a useful strategy. FG materials are high performance composite materials consisting of two or more constituent phases with variegation in composition. This gradation can lead to a desired enhancement in the thermal/mechanical properties, compared to their conventional counterparts. This makes them ideal for various engineering applications including biomedical [11,12], cellular structures [13,14,15,16,17,18], soft robotics [19,20] and several others [21,22].However, typical FG materials could be difficult to fabricate requiring extensive materials processing such as directional solidification [23], specialized machining paths or even additive manufacturing [23,24]. An alternative exists in pursuing surface based strategy such as biomimetic scales. Such dermal scales are a pervasive feature within Kingdom Animalia. Their advantages extend well into a variety of important functions, which enhance survivability, such as protection, camouflaging, and locomotion [25,26,27,28,29]. In nature, certain fishes possess remarkably periodic scale distribution, for instance, Elasmobranchs [30,31] and Teleosts [32,33,34,35]. However, more often, organisms display a large variation in scale distribution within their own bodies [36,37,...

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confidence: 99%

“…Cantilevered beams arise in a number of diverse engineering applications spanning an enormous variety of length scales [1,2,3,4,5,6,7,8,9,10]. In several of these applications, tailoring elasticity can be of tremendous significance since it can be used to design the response according to stimulus or guard against unwanted instabilities.…”

mentioning

confidence: 99%