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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TL;DR: In this article, an improvement was proposed in the vibration attenuation behavior of multi-layer cork structures by means of two smart materials; shear thickening fluid (STF) and shear stiffening polymer (SSP).
43 citations
SIDI1
TL;DR: In this article, a study focused on the passive piezoelectric vibration shunt control technique was performed for bituminous beam. But, the results obtained from a simple Euler Bernoulli beam evaluation, up to 42% of bending vibration reduction was gained by using smart beam.
43 citations
TL;DR: In this paper, a semi-active method for vibration control of flexible structures using smart materials of electrorheological fluids, magnetorheological fluid and elastomers is presented.
Abstract: Vibration control is very significant issue in various engineering fields such as flexible structures, rotor systems, cable and bridge, and vehicle suspension. So far, three different recipes to suppress or control unwanted vibrations are used: passive, semi-active and active. As well known, the passive method has several limitations, such as the lack of real-time avoidance of the time-varying resonances. On the one hand, active vibration control method is very effective, but it is not attractive in terms of cost due to the use of several actuators and sensors. Therefore, recently semi-active vibration control method is popularly used in many practical environments. This article reviews vibration control of flexible structures using the semi-active method associated with smart materials of electrorheological fluids, magnetorheological fluids and magnetorheological elastomers. Modal characteristics of beam, shell and plate incorporating the core (or layer) of smart materials are deeply investigated and discussed in terms of field-dependent controllability. The field-dependent natural frequency and damping property of the sandwich beam type, plate type and shell type are experimentally identified. Subsequently, an appropriate control scheme based on the field-dependent modal properties is formulated to avoid the resonance behavior. In addition, several sandwich beams which are partially filled and fully filled with the magnetorheological fluid are investigated to understand the effectiveness of the modal property change. It has shown that both damping and stiffness properties of the sandwich structures can be effectively controlled by several ways: the change of the field intensity, the location of cores zones, the partial and full treatment and boundary conditions of the structures. In addition, it has identified that mode shapes of the sandwich plates featuring electrorheological core can be partially and fully controlled by applying the input field to an appropriate zone. Smart flexible structures associated with the field-responsive materials can be effectively used for vibration control due to its controllability of the stiffness and damping as well. However, to successfully implement in real environment, a more sophisticated analytical model considering the
microscopic aspects of the particle motions needs to developed. Moreover, the field-dependent bucking problem and acoustic characteristics of smart structures subjected to external disturbances need to be explored.
43 citations
TL;DR: The shape memory effect has been observed in several material systems: metals, ceramics and polymers as mentioned in this paper. But even in classic systems designers are challenged to better analyse what functions the material properties can really bring about in applications such as actuators, smart materials or medical devices
Abstract: The shape memory effect has been observed in several material systems: metals, ceramics and polymers. Mainly metallic systems in which a strain-induced or thermally-induced martensitic transformation occurs, have been explored. Also, recent discoveries have shown that shape memory effects in specific systems can also be driven by changes in hydrostatic pressure or magnetic fields. This indicates that not all effects related to the martensitic transformation have been explored yet for use in application. But even in classic systems designers are challenged to better analyse what functions the material properties can really bring about in applications such as actuators, smart materials or medical devices
43 citations
TL;DR: In this article, a two-way shape memory material based on electroactive polymer and thermoplastic resins has been proposed, which has the capability of changing shape without pre-programming.
Abstract: A practical and facile strategy was proposed to fabricate composites that not only use the properties of individual components (commercial electroactive polymer and thermoplastic resin) to their advantage, but also produce synergy effect of ‘two way’ shape memory properties. In this design, electroactive polymer is treated as soft segment which provides actuation force via converting electrical energy to dynamic energy. Thermoplastic material serves as ‘hard segment’ to help with fixation of temporary shape thanks to its re-structuring and stiffness/modulus changing abilities through the reversible transitional temperature. Compared with traditional one way and two way shape memory materials, this composite material has the capability of changing shape without pre-programming. High shape recover property (99 ± 0.3%.) has been obtained due to the rubber elasticity of electroactive polymer matrix. Many features could be brought up based on this design, such as accurate control over deformation by changing strength of applied electric field as well as tailorable stimulus temperature and mechanical properties.
43 citations