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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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Journal Article
TL;DR: In this article, two methods of vibration control were presented based on shape memory alloy absorber and magnetorheological bearing which was placed in revolute join of manipulator mechanism.
Abstract: Purpose: The goal of this paper is to present application and method of numerical modelling smart materials in vibration control systems. Two methods of vibration control was presented in this work. First one is based on shape memory alloy absorber. Second method use magnetorheological bearing which was placed in revolute join of manipulator mechanism. Design/methodology/approach: The numerical models of presented mechanical systems were created in APDL language, which is internal ANSYS language. Dynamic characteristics of shape memory alloy absorber were determined by using algorithm which automatically changes absorber’s length. The manipulator mechanism with magnetorheological bearing was modelled by using multibody dynamics method connected with finite element method in ANSYS environment. Findings: Through this study it was determined shape memory alloy absorber’s length which eliminated specified resonance due to natural frequencies of mechanical system. The dynamic characteristics of mechanical system with magnetorheological bearing were also obtained. Research limitations/implications: The main disadvantage of presented methods is the necessity to calculate parameters for each iteration step. In the case of shape memory alloy absorber this process significantly extends the calculation time. Practical implications: Presented methods allowed to determine dynamic characteristics of vibration control systems using smart materials and enabled implementation of the method to commercial finite element method environment. Originality/value: This work contains new aspects, which are: determination of shape memory alloy absorber’s length, practical implementation of magnetorheological fluids in vibration control systems.

18 citations

Book ChapterDOI
01 Jan 2019
TL;DR: In this article, the potential of Nitinol (alloy of Ni and Ti) SMA damper to control structural vibrations when subjected to underground blast through a detailed computational study by considering a two-story steel frame as an example problem.
Abstract: The utilization of smart structure technologies to mitigate the vibrations of structures have been the prime focus of numerous scientists involved in the area of structural vibration control. Smart materials serve multiple purposes like that of sensing, actuation and also exhibit the capability of modifying and adjusting the structural behavior when subjected to sudden external shock like earthquake or blast. Smart materials are basically defined as those materials possessing special features and can be applied in the design of structures to enhance the structural performance. Shape Memory Alloys (SMAs) are the most promising and prominent class of smart materials. When strained beyond 6–8%, SMAs possess the ability to regain its original shape. Reversible phase transformation is responsible for such sort of shape recovery. It can be either stress induced (pseudo-elasticity) or temperature induced (shape memory effect). This paper shows the potential of Nitinol (alloy of Ni and Ti) SMA damper to control structural vibrations when subjected to underground blast through a detailed computational study by considering a two-story steel frame as an example problem. Different bracing configurations of the damper are taken into account. A comparative study showing the effectiveness SMA braced damper over the conventional steel bracing is also carried out.

18 citations

Journal ArticleDOI
TL;DR: In this paper, shape control of a composite structure under thermal loading using piezocomposites is investigated, and the composite structure is made of a foam core and two carbon-epoxy face sheets.
Abstract: Maintaining the shape of high-precision structures such as space antennas and optical mirrors is still a challenging issue for designers. These structures are subjected to varying temperature conditions which often introduce thermal distortions. The development of smart materials offers great potential to correct the shape and to minimize the surface error. In this study, shape control of a composite structure under thermal loading using piezocomposites is investigated. The composite structure is made of a foam core and two carbon–epoxy face sheets. Macro-fiber composite (MFC™) patches are bonded on one side of the structure. The structure is subjected to a through-the-thickness temperature gradient which induces thermal distortion, essentially in the form of bending. The objective is to apply electric potential to the MFC™ actuators such that the deflection can be minimized. Finite-element analyses are conducted using the commercial software ABAQUS. Experiments are performed to study thermally induced distortion, piezoelectric actuation, and compensation of thermal distortion using MFC™ actuators. Numerical and experimental results are compared. A control loop based on strain measurements is used to actively control the structure. The results show that MFC™ actuators can compensate thermal distortion at all times, and that this is an efficient methodology.

18 citations

01 Jan 2015
TL;DR: A review of smart biomaterials can be found in this paper, where the main emphasis is on biomedical applications of auxetic materials which comes under the category of 16 smart materials of the twenty first century having a great impact in biomedical area.
Abstract: HARceSZCAReVcZR)dRcVUVdZXBVUeCRTeRdRBpCBCWWqdhZeTYWCcgRcZCfdRaa)ZTReZCBd from macro- to nanometer scale which self-heals or responds to the changes in the environment when one of its property changes by the external conditions like temperature, light, pressure or electricity. This change is reversible and can be repeated for several times. When used for healthcare, it improves its performances in medical devices thus promoting desired biological responses like healing, tissue growth etc. Smart materials can deliver therapeutics to the desig- nated site of the body. It is a challenging task to sketch out the classification of smart materials due to its different approaches and quantity of publications related to this topic, is almost impos- dZS)VeCacCgZUVRTCAacVYVBdZgVcVgZVh$IYVcVRcVgRcZCfdejaVdCWdARceAReVcZR)dBRAV)jm piezoelectric materials, shape memory polymers or alloys, temperature responsive polymers, photomechanical materials, self-healing materials, thermoelectric materials etc. The current review has been focused on smart biomaterials primarily on auxetic materials which are auto- matically adjustable with strength and thickness in response to the applied forces as they have memorial ability to return to its original state on dissipation of the stresses. Here, the main emphasize is on biomedical applications of auxetic materials which comes under the category of 16 smart materials of the twenty first century having a great impact in biomedical area. The information provided through this review may be beneficial for the future development of biomedi- TR)UVgZTVdRBUeYVZcT)ZBZTR)Raa)ZTReZCBdTCBdVbfVBe)jZAacCgZBXeYVbfR)ZejCWaReZVBeqd)ZWV$

18 citations

Journal ArticleDOI
TL;DR: In this article, a special issue on actuators is presented, with articles on piezoelectric, electrostrictive, magnetostrictive and shape memory materials.
Abstract: One of the qualities that distinguishes living systems from inanimate matter is the ability to adapt to changes in the environment. Smart materials have the ability to perform both sensing and actuating functions and are, therefore, capable of imitating this rudimentary aspect of life. Poled piezoelectric ceramics, for instance, are capable of acting as both sensor and actuator. External forces are detected through the direct piezoelectric effect, and a response is elicited through the converse piezoelectric effect, in which a voltage of suitable phase, frequency, and amplitude is applied to the same ceramic.In this special issue, emphasis is placed on actuators, with articles on piezoelectric, electrostrictive, magnetostrictive, and shape memory materials. This is not to say that sensor materials are any less important; it is simply a matter of space. Optical fiber sensors, chemical sensors, thermistors, micromachined semiconductors, and other smart materials deserve special issues of their own.Smart materials can be conveniently subdivided into passively smart materials that respond to external change without assistance, and actively smart materials that utilize a feedback loop enabling them to both recognize the change and initiate an appropriate response through an actuator circuit.Zinc oxide varistors are passively smart materials capable of self-protection against high voltage breakdown. When struck by lightning, the ceramic varistor loses most of its electrical resistance, and the current is bypassed to ground. The resistance change is reversible, and acts as a standby protection phenomenon.

18 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023168
2022315
2021268
2020250
2019252
2018239