Smart materials can change their physical properties in response to a of smart materials and structures, together with its current status and. A smart structure is a system containing multifunctional parts that can perform sensing, control, and actuation; it is a primitive analogue of a biological body. An introduction to smart materials and structures. B S Thompson, M V Gandhi and S Kasiviswanathan*. Abstract - This paper presents an exposition on the.
|Language:||English, Spanish, Portuguese|
|Genre:||Health & Fitness|
|ePub File Size:||15.74 MB|
|PDF File Size:||18.17 MB|
|Distribution:||Free* [*Register to download]|
PDF | On Dec 30, , Ghareeb N and others published Smart Materials and Structures: State of the Art and Applications. Smart structures or smart materials systems are those which incorporate actuators and sensors that highly integrate into the structures and have. Bookreviews Smart materials and structures page M.V. Gandhi In particular, there is no mention of the use of optical fibres in combination with.
Highly application-oriented approach to the field of intelligent materials and structures. Each chapter contains numerous figures and equations illustrating and explaining the topic. Aims and Scope Intelligent Materials and Structures provides exceptional insights into designing intelligent materials and structures for special applications in engineering. The author introduces the fundamental materials science involved in research endeavors and simultaneously reviews the current state-of-the-art of intelligent materials and structures. Separate chapters are devoted to the thorough examination of theory and application of laminated composite materials, Piezoelectricity, Shape Memory Alloys, Electro- and Magnetorheological fluids as well as Magneto- and Electrostrictive materials. Each chapter contains numerous equations and figures describing theories, models and behavior of the intelligent material discussed. Special attention is paid to applications of intelligent materials to various structures in the aerospace and medical sector, piezoelectric motors as well as piezoelectric and electromagnetic energy harvesting.
Carman University of California electron gun shape control of piezoelectric materials, at Los Angeles including possible shape-control limits, resolution, and dynamic behavior. Both analytical and computation This research effort addresses the need to develop and models are being developed and verified with experi- understand coupled hybrid magnetomechanical com- A. Piezoelectric bimorph configuration left that allows actuation via a non-contact electron gun source that can target multiple locations of the distributed active surface right.
Courtesy of J. Main, University of Kentucky. The composite represents a mag- basic science questions is to what extent does magnetic netostrictive active material that elastically deforms interaction between dissimilar particles contribute to alt- when subjected to an external magnetic field. It contains ering the internal magnetic circuit. The magnetic field several advantages when compared to the monolithic applied during cure aligns the particulates into continu- magnetostrictive materials, including increased fracture ous chains and forms a continuous magnetic circuit toughness, reduced hysteresis, larger bandwidth within the material.
One of the primary Fig. Schematic illustrating formation of magnetostrictive composites upper. Performance of magnetostrictive composites of varied volume fractions lower left and using different magnetostrictive particle sizes to tailor strain output potential under varied stress lower right.
Carman, University of California at Los Angeles. Synthesis of smart material actuator systems for 3.
Remote sensing of damage in large civil low- and high-frequency macro motion: an analytical structures using embedded sensors for hazard and experimental investigation, G. Naganathan mitigation, D. Pines University of Maryland University of Toledo The project involves integrating research and edu- This project is to demonstrate that motions of a few cation to advance the technology of smart materials and centimeters can be performed by smart material actuator structures and techniques to remotely monitor damage systems.
A program that combines theoretical investi- in large civil structures. The research focuses on the gations and experimental demonstrations is being con- development of a smart civil structure with embedded ducted. Potential configurations made of piezoceramic piezoelectric sensors for inferring structural damage. The and electrostrictive materials are being evaluated for pro- research will emphasize the integration of embedded viding larger motions at reasonable force levels for sensors, actuators and processors into load-carrying applications.
Laboratory demonstration of remote health monitoring and damage detection.
Courtesy of D. Pines, University of Maryland. Magnetostrictive transducer strain per magnetization bode plot and strain versus magnetization minor loops. Hysteresis minor loop data collected at from left to right : 10, , , , , , and Hz. Courtesy of A. Flatau, Iowa State University. The goal is to Acknowledgements develop a parallel approach that bridges the gap between theory and reality, and addressing the challenges in Input and additions by NSF grantees and colleagues, implementing this technology.
Bergman, G. Carman, O. Dillon, C. Hartley, P. Ifju, S. Liu, J. Main, W. Patten, 3. Magnetostrictive actuator development for D. Pines, C. Rogers, S.
Saigal, B. Spencer, G. Flatau Iowa State Washington, and N. Wereley, are gratefully acknowl- University edged. This research seeks to design, develop and implement References a system of magnetostrictive actuators for sensing and control of structural vibrations.
Elasticity in engineering mechanics. New the design and implementation of magnetostrictive trans- York: John Wiley, Long term durability of materials quency response studies and modeling of system nonlin- and structures: modeling and accelerated techniques.
NSF The effort is  National Science Foundation. Engineering sciences for modeling motivated in part by the availability of magnetostrictive and simulation-based life-cycle engineering. Nanoscale modeling and simul- ation. Exploratory research on model- based simulation. Knowledge and distributed intelli- 4. Summary and conclusions gence in the information age.
An overview of the state of the art and engineering  National Science Foundation. Civil infrastructure systems research in smart structures and materials is presented. Engineering The cited examples provide only a very limited set of research in composite and smart structures. Mary Frecker and Dr.
Nancy Johnson for pursuing and managing the creation of the special issue, and I am looking forward to seeing smart product design a growing area of publication in JMD. Panos Y. As was discussed in the March editorial on Design Innovation, JMD embraces a wide variety of design-oriented research papers, including those on smart materials, structures and systems.
This special issue focuses on innovative technologies and new methods to design and analyze these devices. Smart materials and structures can be thought of as those that adapt to their environment in some way, and they often provide previously unattainable functionality and performance. Smart materials alter their mechanical properties or provide some mechanical work in response to an external, e.
Figure 7 is the typical structure of type A zeolite. It is composed of tetrahedral AlO4 and SiO4 linked through oxygen atoms to form open frameworks. The negative charges that accompany each aluminum atom in the frameworkare balanced by the extra framework metal cations.
The ER effect of these aluminosilicates systems is considered to be originated from the interfacial polarization induced by mobility of metal cations loosely bound in framework. The ER activity can be changed with metal cations concentration and diameter, and thus we can easily obtain excepted physical and chemical properties for high ER performance by modification and design on the crystal structure, cation composition, etc.
Furthermore, the surface area and pore size of the microporous molecular sieve materials is also important for ER activity due to the influence on carriers drift and aggregation. Another shortcoming is large and irreversible particle sedimentation.
Furthermore, aluminosilicate particles are hard, and abrasive to the ER device. This kind of fluid is claimed to show a strong ER effect, low electric power consumption, and excellent durability. Fullerene-type materials have also been found to show are markable ER effect. Fullerene-enriched soot and fullerene mixtures, particularly C60 mixed with C70 with a trace amount of C84 and C92, display ER behavior. The ER properties of fullerene-type materials can be tailored by appropriate encapsulation of ions within the hollow sphere or by adsorption on the surface [10,32].
Metal Oxide Metal oxide has wide types and different electric properties and various types of metal oxides have been used in ER fluids, but no high-performance metal oxide based ER materials have been developed. In particular, TiO2 is a very typical ER material that has attracted considerable attention as a potential candidate for high performance ER material due to its high dielectric constant .
However, the very low yield stress of this ER fluid is in contrast with its distinct chain structure when in dry state. This is amazing and cannot be understood by the conventional polarization mechanisms. It has been reported that the ER activity of TiO2 could be promoted by adsorption of moisture and this phenomenon had been explained by the increase of conductivity .
But the ER activity of pure crystalline TiO2 based ER system is still very weak after absorption of moisture even if its conductivity increases by several orders of magnitude. Moreover, the extrinsic effect of adsorbed water is not helpful to understand this particular ER material. Therefore, TiO2 is a very good model material to understand ER mechanism of metal oxide and preparation of active metal oxide ER materials.
According to the polarization mechanism, ER effect originates from the dielectric polarization of particles dispersed in medium oil.
The parameters in connection with particle polarization such as dielectric constant, dielectric loss or conductivity have been accepted as basic factors dominating ER effect [36,37]. Although TiO2 possessed high dielectric constant, its conductivity or dielectric loss was found to be very low, which may be related to its natural structure that atomic or ion polarization dominated dielectric properties.
Thus, it is possible to modify the dielectric and polarization properties to increase ER activity by designing of molecular and crystal structure of ER materials. In the recent reports , doping, as one means of modifying the properties of a wide variety of materials, was introduced to improve ER activity by Zhao et al.
The yield stress of typical ceriumdoped TiO2 suspension was about 5. Especially, the yield stress showed a marked dependence on RE doping degree.
These were well explained by the dielectric measurements that showed an increase in the dielectric loss and the dielectric constant at low frequency and their regular change with rare earth content. Figure 8 shows the typical rheological curves of rare earth-doped TiO2 ER fluid at room temperature. Based on the structure analysis and dielectric and conduction measurements, doping induced ER enhancement of TiO2 was attributed to the improvement in the dielectric and conduction properties, which may be resulted from the activated internal structure including defect and impurities of TiO2 due to doping.
Furthermore, Li, et al also  noted that the crystal size, phase structure also had an influence on the ER effect of rare earth-doped TiO2 system.