Topic
Smart material
About: Smart material is a research topic. Over the lifetime, 3704 publications have been published within this topic receiving 74280 citations. The topic is also known as: intelligent material & responsive material.
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01 Jan 1989
22 citations
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TL;DR: In this article, the elastic postbuckling response of cylindrical shells under axial compression was investigated and three avenues were presented to tailor and control the elastic response of axially-compressed shells: seeded geometric imperfections (SGI), non-uniform stiffness distributions (NSD), and lateral constraints and interactions (LCI).
22 citations
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TL;DR: In this paper, the authors developed a robust and simple method to remove oil from oily wastewater using a smart material with switchable surface wettability, which is highly desired for the practical application in removing oily wastewater.
Abstract: A smart material with switchable surface wettability is highly desired for the practical application in removing oil from oily wastewater. In this work, we developed a robust and simple method to f...
22 citations
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TL;DR: In this article, it was shown that a constant voltage loading reduces stiffness, down to zero in some cases, while a constant charge loading increases stiffness, depending on the electrical loading of the dielectric elastomer.
Abstract: Dielectric elastomers, or more precisely dielectric polymers, are a relatively new class of materials for variable-stiffness and variable-damping devices. Dielectric elastomers offer significant potential advantages compared with previous variable stiffness smart materials. Advantages include simplicity, broad dynamic range, ability to reach zero stiffness, low cost, minimal mass, shock tolerance, simple drive circuitry, and design flexibility. Dielectric elastomer devices in the variable-stiffness mode convert electrical and mechanical energy back and forth to change mechanical impedance. This type of electromechanical transduction distinguishes the variable stiffness mode from simply using a dielectric elastomer actuator to alter the geometry, and hence the stiffness, of the device. Stiffness using a variable-stiffness mode depends heavily on the electrical loading of the dielectric elastomer. Analysis shows that a constant voltage loading reduces stiffness, down to zero in some cases, while a constant charge loading increases stiffness. Many applications can be considered for dielectric elastomer variable-stiffness mode such as vibration control, suspensions, and tuning consumer devices for user comfort or preference. As with dielectric elastomer actuators and generators, silicones and acrylics are the most promising materials for variable-stiffness-mode devices.
22 citations
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TL;DR: In this article, the authors present a discussion of air-vehicle power system architectures for actuators, including variable shape inlets and control surfaces that utilize shape memory alloys (SMAs), full-span, chord-wise and span-wise contouring trailing control surfaces, and other strain-based actuators.
Abstract: Electrical power distribution for recently developed smart actuators becomes an important air-vehicle challenge if projected smart actuation benefits are to be met. Among the items under development are variable shape inlets and control surfaces that utilize shape memory alloys (SMAs); full-span, chord-wise and span-wise contouring trailing control surfaces that use SMA or piezoelectric materials for actuation; and other strain-based actuators for buffet load alleviation, flutter suppression and flow control. At first glance, such technologies afford overall vehicle performance improvement. However, integration system impacts have yet to be determined or quantified. Power systems to support smart structures initiatives are the focus of the current paper. The paper has been organized into five main topics for further discussion: (1) air-vehicle power system architectures – standard and advanced distribution concepts for actuators, (2) smart wing actuator power requirements and results highlighting wind tun...
22 citations