Download or read book Modeling and Design of One Dimensional Shape Memory Alloy Actuators written by Guhan Kumar and published by . This book was released on 2000 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The motion of these actuators are modeled for both compression and expansion processes. Experiments are carried out using load cells at various displacements of the actuators, in order to determine the force outputs at various displacements. The experimental results are compared with the models. The force-deflection curves would be expected to correlate to the stress-strain curves because force is analogous to stress and displacement, to strain. These, and other observed phenomena are explained from the point of view of shape memory alloy behavior. There has not been much research dedicated towards designing linear shape memory actuators that would be able to travel both inward and outward depending on the user input from a remote control, which is basically what this research aims to do. A detailed study has also been carried out on the force-displacement relations of these actuators and correlated with the observed behavior of shape memory alloys, which again is a novel feature of this research. The main advantage of shape memory alloys over other smart materials is that they have a very high recoverable strain and force output. These factors contribute chiefly to various potential and existing applications. These compensate for the main disadvantages associated with SMAs, which are heat loss and high power requirements.
Download or read book Shape Memory Alloy Actuators written by Mohammad H. Elahinia and published by John Wiley & Sons. This book was released on 2016-01-19 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a systematic approach to realizing NiTi shape memory alloy actuation, and is aimed at science and engineering students who would like to develop a better understanding of the behaviors of SMAs, and learn to design, simulate, control, and fabricate these actuators in a systematic approach. Several innovative biomedical applications of SMAs are discussed. These include orthopedic, rehabilitation, assistive, cardiovascular, and surgery devices and tools. To this end unique actuation mechanisms are discussed. These include antagonistic bi-stable shape memory-superelastic actuation, shape memory spring actuation, and multi axial tension-torsion actuation. These actuation mechanisms open new possibilities for creating adaptive structures and biomedical devices by using SMAs.
Download or read book Modeling and Analysis of One and Two Dimensional Shape Memory Alloy elastomer Actuators written by Weida Wu and published by . This book was released on 1996 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Modeling of Shape Memory Alloys for Actuation of Large scale Structures written by Abhimanyu Kumar and published by . This book was released on 2010 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inspired by universe, the design of smart systems and structures that can repair themselves have always been one of the ambitions of engineers and researchers. Throughout the history of science, metals and alloys have played an important role in the advancement of engineering, science & technology. With the emerging new class of materials, Shape Memory Alloys (SMAs) are being viewed as an alloy for a new era. The good performance of SMAs in commercial applications (e.g. Boeing adaptive chevron, Mars Sojourner Rover Actuator, Biomedical Stents etc.) has been well established. SMAs are primarily known for their shape recovery characteristics that occur as a result of the transformation between two phases: Austenite and Martensite. These materials undergo a diffusionless, thermoelastic, martensitic phase transformation, and can recover strains as large as 8%. However, the true potential of these materials has not yet been realized in practical applications. A lack of sufficient experimental information and unified approaches to constitutive modeling has made it difficult for designers to incorporate these vastly unique materials in practical ways. In general, the constitutive modeling approaches utilized by various research groups around the world have been based on the classical plasticity theories. Also, most of the models reported in the literature are either one dimensional, and/or extended in ad-hoc ways to capture three dimensional aspects. These models are prepared with an eye towards fitting a specific set of experimental data (i.e. a specific set of SMA features). The most common feature of SMAs of practical importance is the evolution with cycles that has almost always been neglected by the researchers. In the current research, a new, fully general, completely three dimensional, multimechanism based, viscoelastoplastic, unified SMA constitutive model has been developed as an extension of previously formulated constitutive theory by Saleeb et al. for high temperature Ti-alloys. The success of the present unified model in describing all the salient features of SMAs (uniaxial, multiaxial, coupled thermomechanical, evolution with cycles, rate effects, etc.) is attributed to the careful partitioning of energy (into storage and dissipation) through multiplicity of viscoelastoplastic mechanisms, and to the strict adherence to the well established mathematical and thermodynamical requirements of convexity, associativity, normality, etc. It will be shown that the present thermodynamical framework is able to capture all the known features, as well as the evolutionary characteristics, of SMAs. The present unified SMA constitutive model has been fully integrated with a commercial, large-scale, finite element package. For the demonstration of its capability and efficiency for boundary value problems, an application of SMAs as actuators for wing morphing (shape control) of a conceptual aircraft wing will be presented. Unlike other SMA actuation mechanisms, where only uniaxial response and one-way shape memory effects have been utilized, the current design concept focuses on the complete three dimensional description of actuation under biased, thermal-cycling conditions, and has led to an interesting concept for future aircraft wings.
Download or read book Design of Shape Memory Alloy SMA Actuators written by Ashwin Rao and published by Springer. This book was released on 2015-05-08 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: This short monograph presents an analysis and design methodology for shape memory alloy (SMA) components such as wires, beams, and springs for different applications. The solid-solid, diffusionless phase transformations in thermally responsive SMA allows them to demonstrate unique characteristics like superelasticity and shape memory effects. The combined sensing and actuating capabilities of such materials allows them to provide a system level response by combining multiple functions in a single material system. In SMA, the combined mechanical and thermal loading effects influence the functionality of such materials. The aim of this book is to make the analysis of these materials accessible to designers by developing a "strength of materials" approach to the analysis and design of such SMA components inspired from their various applications with a review of various factors influencing the design process for such materials.
Download or read book Shape Memory Microactuators written by Manfred Kohl and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overview of recent achievements, describing the microactuator development of microvalves and liner actuators comprehensively from concept through prototype. Further key aspects included are three-dimensional models for handling complex SMA actuator geometries and coupled simulation routines that take multifunctional properties into account. Mechanical and thermal optimization criteria are introduced for actuator design, allowing an optimum use of the shape memory effect. It is shown that some of the prototypes presented, e.g. SMA microgrippers, already outperform conventional components.
Download or read book Fundamentals of Smart Materials written by Mohsen Shahinpoor and published by Royal Society of Chemistry. This book was released on 2020-04-22 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook covers the fundamentals of different functional material systems aimed at advanced undergraduate and postgraduate students. Each chapter includes an introduction to the material, its applications and uses with example problems, fabrication and manufacturing techniques, conclusions, homework problems and a bibliography. Edited by a leading researcher in smart materials, topics include piezoelectric materials, magnetostrictive materials, shape memory alloys, mechanochromic materials, chemomechanical polymers and self-healing materials.
Download or read book Engineering Aspects of Shape Memory Alloys written by T W Duerig and published by Butterworth-Heinemann. This book was released on 2013-10-22 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering Aspects of Shape Memory Alloys provides an understanding of shape memory by defining terms, properties, and applications. It includes tutorials, overviews, and specific design examples—all written with the intention of minimizing the science and maximizing the engineering aspects. Although the individual chapters have been written by many different authors, each one of the best in their fields, the overall tone and intent of the book is not that of a proceedings, but that of a textbook. The book consists of five parts. Part I deals with the mechanism of shape memory and the alloys that exhibit the effect. It also defines many essential terms that will be used in later parts. Part II deals primarily with constrained recovery, but to some extent with free recovery. There is an introductory paper which defines terms and principles, then several specific examples of products based on constrained recovery. Both Parts III and IV deal with actuators. Part III introduces engineering principles while Part IV presents several of the specific examples. Finally, Part V deals with superelasticity, with an introductory paper and then several specific examples of product engineering.
Download or read book Shape Memory Alloy Engineering written by Antonio Concilio and published by Elsevier. This book was released on 2014-09-25 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shape Memory Alloy Engineering introduces materials, mechanical, and aerospace engineers to shape memory alloys (SMAs), providing a unique perspective that combines fundamental theory with new approaches to design and modeling of actual SMAs as compact and inexpensive actuators for use in aerospace and other applications. With this book readers will gain an understanding of the intrinsic properties of SMAs and their characteristic state diagrams, allowing them to design innovative compact actuation systems for applications from aerospace and aeronautics to ships, cars, and trucks. The book realistically discusses both the potential of these fascinating materials as well as their limitations in everyday life, and how to overcome some of those limitations in order to achieve proper design of useful SMA mechanisms. Discusses material characterization processes and results for a number of newer SMAs Incorporates numerical (FE) simulation and integration procedures into commercial codes (Msc/Nastran, Abaqus, and others) Provides detailed examples on design procedures and optimization of SMA-based actuation systems for real cases, from specs to verification lab tests on physical demonstrators One of the few SMA books to include design and set-up of demonstrator characterization tests and correlation with numerical models
Download or read book High Temperature Materials and Mechanisms written by Yoseph Bar-Cohen and published by CRC Press. This book was released on 2014-03-03 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of high-temperature materials in current and future applications, including silicone materials for handling hot foods and metal alloys for developing high-speed aircraft and spacecraft systems, has generated a growing interest in high-temperature technologies. High Temperature Materials and Mechanisms explores a broad range of issues related to high-temperature materials and mechanisms that operate in harsh conditions. While some applications involve the use of materials at high temperatures, others require materials processed at high temperatures for use at room temperature. High-temperature materials must also be resistant to related causes of damage, such as oxidation and corrosion, which are accelerated with increased temperatures. This book examines high-temperature materials and mechanisms from many angles. It covers the topics of processes, materials characterization methods, and the nondestructive evaluation and health monitoring of high-temperature materials and structures. It describes the application of high temperature materials to actuators and sensors, sensor design challenges, as well as various high temperature materials and mechanisms applications and challenges. Utilizing the knowledge of experts in the field, the book considers the multidisciplinary nature of high temperature materials and mechanisms, and covers technology related to several areas including energy, space, aerospace, electronics, and metallurgy. Supplies extensive references at the end of each chapter to enhance further study Addresses related science and engineering disciplines Includes information on drills, actuators, sensors and more A comprehensive resource of information consolidated in one book, this text greatly benefits students in materials science, aerospace and mechanical engineering, and physics. It is also an ideal resource for professionals in the industry.
Download or read book Intelligent Structures written by K.P. Chong and published by CRC Press. This book was released on 2003-10-04 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the International Workshop on Intelligent Structures, Taipei, Taiwan, 23-26 July 1990.
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alloys and Intermetallic Compounds written by Cristina Artini and published by CRC Press. This book was released on 2017-07-12 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the role of modeling in the design of alloys and intermetallic compounds. It includes an introduction to the most important and most used modeling techniques, such as CALPHAD and ab-initio methods, as well as a section devoted to the latest developments in applications of alloys. The book emphasizes the correlation between modeling and technological developments while discussing topics such as wettability of Ultra High Temperature Ceramics by metals, active brazing of diamonds to metals in cutting tools, surface issues in medicine, novel Fe-based superconductors, metallic glasses, high entropy alloys, and thermoelectric materials.
Download or read book Adaptive Structures Tenth International Conference Proceedings written by Roger Ohayon and published by CRC Press. This book was released on 2000-03-13 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Rules for Actuators in Active Mechanical Systems written by Oriol Gomis-Bellmunt and published by Springer Science & Business Media. This book was released on 2009-10-29 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Design Rules for Actuators in Active Mechanical Systems" deals with the formulation of model-based design rules to be used in the conception of optimized mechatronic and adaptronic systems. The book addresses the comparison of different actuator classes for given applications and offers answers to the following questions: What is the relationship between actuator geometry and primary output quantities? How scalable are actuators based on the same principle? How are energetic output quantities (work and power) related to mechanical load and geometry? How should actuators be designed and sized to obtain the best performance for the chosen actuator kind, and for a given application? "Design Rules for Actuators in Active Mechanical Systems" will be of use to industry professionals, such as actuator and machine designers, as well as to researchers and students of mechanical engineering, mechatronics, and electrical engineering.
Download or read book Shape Memory Actuators for Tab Assisted Control Surfaces written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Actuation equations for a tab control system have been derived based on one-dimensional shape memory behavior. This actuation model accounts for the active tendon having to pull against the relaxing tendon in a two-tendon actuator. That is, the passive tendon will provide a negative moment, subtracting from the total moment available for moving the tab. In addition, studies on the heat convection of SMA in water and moving water have been performed in an attempt to determine the available control moment in moving water and to predict the amount of energy needed. These results identify the research issues that must be overcome in making a recommendation regarding the feasibility of using SMA in a submarine for actuation. The result is that use of SMA is feasible, but the exact performance results are not predictable with the current state-of-the-art in SMA modeling. Furthermore, predictive design models specific to applications in moving water are needed to understand the issues of: (1) exact moment prediction, (2) exact heat signature, and (3) control predictions for maneuvering.
Download or read book Morphing Aerospace Vehicles and Structures written by John Valasek and published by John Wiley & Sons. This book was released on 2012-02-24 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Morphing Aerospace Vehicles and Structures provides a highly timely presentation of the state-of-the-art, future directions and technical requirements of morphing aircraft. Divided into three sections it addresses morphing aircraft, bio-inspiration, and smart structures with specific focus on the flight control, aerodynamics, bio-mechanics, materials, and structures of these vehicles as well as power requirements and the use of advanced piezo materials and smart actuators. The tutorial approach adopted by the contributors, including underlying concepts and mathematical formulations, unifies the methodologies and tools required to provide practicing engineers and applied researchers with the insight to synthesize morphing air vehicles and morphing structures, as well as offering direction for future research.
