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Dynamic Actuation Properties Of Ni Mn Ga Ferromagnetic Shape Memory Alloys
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Book Synopsis Dynamic Actuation Properties of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys by : Christopher Paul Henry
Download or read book Dynamic Actuation Properties of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys written by Christopher Paul Henry and published by . This book was released on 2002 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) The mechanism of stress generation is thought to be magnetization rotation causing negative magnetostriction with quadratic magnetic-field dependence before twin boundaries move. Above the threshold field for twin boundary motion, stress increases in proportion to the magnetic-field-induced strain. Dynamic actuation measurements performed here help put Ni-Mn-Ga FSMAs into perspective with other active materials performance: Ni-Mn-Ga FSMAs are between low bandwidth, high strain, Nitinol and high bandwidth, low strain Terfenol-D and ferroelectrics.
Book Synopsis Characterization and Modeling of the Ferromagnetic Shape Memory Alloy Ni-Mn-Ga for Sensing and Actuation by : Neelesh Nandkumar Sarawate
Download or read book Characterization and Modeling of the Ferromagnetic Shape Memory Alloy Ni-Mn-Ga for Sensing and Actuation written by Neelesh Nandkumar Sarawate and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Ferromagnetic Shape Memory Alloys (FSMAs) in the Ni-Mn-Ga system are a recent class of active materials that can generate magnetic field induced strains of 10% by twin-variant rearrangement. This work details an extensive analytical and experimental investigation of commercial single-crystal Ni-Mn-Ga under quasi-static and dynamic conditions with a view to exploring the material's sensing and actuation applications. The sensing effect of Ni-Mn-Ga is experimentally characterized by measuring the flux density and stress as a function of quasi-static strain loading at various fixed magnetic fields. The bias field is shown to mark the transition from irreversible to reversible (pseudoelastic) stress-strain behavior. A constitutive model based on continuum thermodynamics is developed to describe the coupled magnetomechanical behavior of Ni-Mn-Ga. Mechanical dissipation and the microstructure of Ni-Mn-Ga are incorporated through internal state variables. The constitutive response of the material is obtained by restricting the process through the second law of thermodynamics. The model is further modified to describe the actuation and blocked-force behavior under a unified framework.
Book Synopsis Acoustic Assisted Actuation of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys by : Bradley William Peterson
Download or read book Acoustic Assisted Actuation of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys written by Bradley William Peterson and published by . This book was released on 2006 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferromagnetic shape memory alloys (FSMA) have been shown in recent work to exhibit large magnetic field induced strains. The material generally requires a large threshold field (of order 3-4 kOe) to initiate the strain. Thus, the power requirements are large and actuators based on these materials could tend to be large. This thesis reports on the effect on the actuation properties of Ni-Mn-Ga single crystals of the use of a sinusoidal stress wave generated by a piezoelectric stack actuator. The piezoelectric drive causes a time varying stress wave in the FSMA that resolves as a shear across the twin-boundaries and aids the twin boundary in overcoming defect-related obstacles. The FSMA shows increased strain and a reduction in threshold field. The effect is most pronounced for crystals showing large initial threshold fields which are associated with high defect strengths or concentrations. For crystals with a large threshold, 4.7 kOe, actuated at 1 Hz, the piezoelectric drive reduces the threshold field by as much as 21% for a piezoelectric driven at 5 kHz and 20 Vrms. As a result of this large threshold reduction, strain output can be more than doubled for magnetic drive amplitudes near the threshold field.
Book Synopsis Shape Memory Alloys by : Farzad Ebrahimi
Download or read book Shape Memory Alloys written by Farzad Ebrahimi and published by BoD – Books on Demand. This book was released on 2017-09-20 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a result of contributions of experts from international scientific community working in different aspects of shape memory alloys (SMAs) and reports on the state-of-the-art research and development findings on this topic through original and innovative research studies. Through its five chapters, the reader will have access to works related to ferromagnetic SMAs, while it introduces some specific applications like development of faster SMA actuators and application of nanostructural SMAs in medical devices. The book contains up-to-date publications of leading experts, and the edition is intended to furnish valuable recent information to the professionals involved in shape memory alloys analysis and applications. The text is addressed not only to researchers but also to professional engineers, students, and other experts in a variety of disciplines, both academic and industrial, seeking to gain a better understanding of what has been done in the field recently and what kind of open problems are in this area.
Book Synopsis Ferromagnetic Shape Memory Alloys II by : Volodymyr A. Chernenko
Download or read book Ferromagnetic Shape Memory Alloys II written by Volodymyr A. Chernenko and published by Trans Tech Publications Ltd. This book was released on 2009-12-03 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). This work on Ferromagnetic Shape Memory Alloys contains selected peer-reviewed papers. Such materials belong to the most exciting and fastest-growing group of martensitic multifunctional materials. The selected papers cover the following topics of: Basic phenomena and theory; Structure and magnetic properties; Magnetomechanics and magnetocaloric effect; Thin films and composites; Modeling and simulations and Processing and engineering.
Book Synopsis Magneto-mechanical Properties and Applications of Ni-Mn-Ga Ferromagnetic Shape Memory Alloy by : Steven James Murray
Download or read book Magneto-mechanical Properties and Applications of Ni-Mn-Ga Ferromagnetic Shape Memory Alloy written by Steven James Murray and published by . This book was released on 2000 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study on Phase Stability, Structural and Magnetic Properties of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys by Ab Initio Calculations by : Nan Xu
Download or read book Study on Phase Stability, Structural and Magnetic Properties of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys by Ab Initio Calculations written by Nan Xu and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) with chemical composition close to Ni2MnGa have received great attention due to their giant magnetic shape memory effect and fast dynamic response. In this work, a series of first-principles calculations have been performed within the framework of the Density Functional Theory (DFT) using the Vienna Ab initio Software Package (VASP). For the stoichiometric Ni2MnGa ferromagnetic shape memory alloy, the oscillation of Ni magnetic moment that depends on the atomic shuffling in the superstructure dominates the distribution of the total magnetic moment per Ni2MnGa unit. The structure change-associated total magnetic moment has been found to increase for Ni2MnGa unit from the cubic austenite to the tetragonal NM martensite through the monoclinic modulated martensites. For the off-stoichiometric Ni2MnGa ferromagnetic shape memory alloys, Ni-doping stabilizes the non-modulated martensite (NM) with simple tetragonal crystal structure, whereas proper Mn-doping stabilizes the seven-layered modulated (7M) martensite with monoclinic structure. Martensitic transformation experiences much larger driving force than that of the intermartensitic transformation. Moreover, the total magnetic moment of the three series of alloys is mainly dominated by their Mn content with little phase state dependence. The average Ni and Mn moments display both composition and phase state dependences. The perturbation of the magnetic moments by atom substitution is mainly located in the antisite and its close neighbors. It is mainly dominated by their Mn environment (distance and number). Insights into fundamental aspects such as phase stability and magnetic properties in Ni-Mn-Ga FSMAs are of great significance to improve the functional performances and to design new promising FSMAs.
Book Synopsis Magneto-mechanical Properties and Applications of Ni-Mn-Ga Ferromagnetic Shape Memory Alloy by :
Download or read book Magneto-mechanical Properties and Applications of Ni-Mn-Ga Ferromagnetic Shape Memory Alloy written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: By Steven J. Murray.
Book Synopsis Shape Memory Composites Based on Polymers and Metals for 4D Printing by : Muni Raj Maurya
Download or read book Shape Memory Composites Based on Polymers and Metals for 4D Printing written by Muni Raj Maurya and published by Springer Nature. This book was released on 2022-05-18 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shape Memory Composites Based on Polymers and Metals for 4D Printing is a thorough discussion of the physics and chemistry behind this developing area of materials science. It provides readers with a clear exposition of shape-memory-composite (SMC) preparation techniques for 3D and 4D printing processes and explains how intelligent manufacturing technology may be applied in fields such as robotics, construction, medical science, and smart sensors. The book covers fundamental background knowledge on the synthesis of shape memory polymers (SMPs) and shape memory alloys (SMAs), and additive manufacturing techniques. Polymers and metals and their roles in 4D printing are dealt with separately, and applications of 4D printing are treated in their own chapter. The different alloy compositions and nanoparticle fillers in polymer composites are examined in detail, along with the key mechanisms involved in their processing. Hybrid nanofillers and synergistic composite mixtures, which are either in extensive current use or have shown promising outcomes in the field of 4D printing, are thoroughly discussed. Differences between these novel SMCs and traditional metal alloys, organic and inorganic composites are presented, and means by which they can improve mechanical properties that are triggered by external sources like magnetic field, temperature, and pH of solvent, are set out. This book provides practitioners, industrial researchers, and scholars with a state-of-the-art overview of SMP/SMA synthesis, additive manufacturing, modification in synthesis of SMCs for 4D printing, and their likely future applications.
Book Synopsis Ferromagnetic Shape Memory Alloys by : Lluis Manosa
Download or read book Ferromagnetic Shape Memory Alloys written by Lluis Manosa and published by Trans Tech Publications Ltd. This book was released on 2008-06-19 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). Multiferroic shape-memory alloys that exhibit both ferroelastic and ferromagnetic properties have recently attracted much attention. They belong to the family of so-called smart materials and are future-generation materials that are likely to be useful in cutting-edge technologies. Apart from the theoretical challenge of understanding their fascinating properties, the quest to harness them for practical use is also attracting many scientists and engineers from all over the world.
Book Synopsis Lattice Dynamics in Ferromagnetic Shape Memory Alloy System Ni-Mn-Ga by : Semih Ener
Download or read book Lattice Dynamics in Ferromagnetic Shape Memory Alloy System Ni-Mn-Ga written by Semih Ener and published by . This book was released on 2012 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Composition, Structure and Magneto-mechanical Properties of Ni-Mn-Ga Magnetic Shape-memory Alloys by : Markus Chmielus
Download or read book Composition, Structure and Magneto-mechanical Properties of Ni-Mn-Ga Magnetic Shape-memory Alloys written by Markus Chmielus and published by Logos Verlag Berlin. This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic shape-memory alloys (MSMAs) are smart materials which show in single crystalline form a magnetic field induced plastic and recoverable deformation of up to 10 %. Ni-Mn-Ga is the as most prominent representative. The shape change of MSMAs is based on the motion of twin boundaries driven by a magneto-stress due to an applied magnetic field. The plastic deformation takes place in the martensite phase and does not require a phase change as needed in shape-memory alloys (SMAs). The combination of high strain of SMAs and high actuation frequencies positions MSMAs as attractive smart actuator materials. Several aspects influence the magneto-mechanical properties. To identify the influence of composition, surface deformation, and constraints separately, this dissertation consists of three parts: first, the characterization of composition, structure, transformation temperatures, magnetic and mechanical properties as a study on position within an ingot. Second, the influence of surface polishing and surface deformation on the twinning stress. Third, the influence of training and constraints on magneto-mechanical properties. It can be shown in this work that each of the investigated aspects has strong influences on i.e. martensite structure and transformation temperatures, twinning stresses, twin microstructure, and magneto-mechanical properties of MSMAs.
Book Synopsis Magnetic Shape Memory Alloys by : Xuexi Zhang
Download or read book Magnetic Shape Memory Alloys written by Xuexi Zhang and published by Springer Nature. This book was released on 2021-11-14 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book systematically describes the fundamentals of Magnetic shape memory alloys (MSMAs), with an emphasis on low-dimensional structures such as foams, microwires and micro-particles. The respective chapters address basic concepts and theories, the fabrication of various architectures, microstructure tailoring, property optimization and cutting-edge applications. Taken together, they provide a clear understanding of the correlation between processing and the microstructural properties of MSMAs, which are illustrated in over two hundred figures and schematics. Given its scope and format, the book offers a valuable resource for a broad readership in various fields of materials science and engineering, especially for researchers, students and engineers.
Book Synopsis Advances in Magnetic Shape Memory Materials by : Volodymyr A. Chernenko
Download or read book Advances in Magnetic Shape Memory Materials written by Volodymyr A. Chernenko and published by Trans Tech Publications Ltd. This book was released on 2011-05-17 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special topic volume with invited peer reviewed papers only.
Book Synopsis Structural and Electronic Properties of Ni-Mn-Ga Magnetic Shape Memory Alloys by : Aleksej Laptev
Download or read book Structural and Electronic Properties of Ni-Mn-Ga Magnetic Shape Memory Alloys written by Aleksej Laptev and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization and Modeling of Ferromagnetic Shape Memory Ni-Mn-Ga in a Collinear Stress-field Configuration by : LeAnn Elizabeth Faidley
Download or read book Characterization and Modeling of Ferromagnetic Shape Memory Ni-Mn-Ga in a Collinear Stress-field Configuration written by LeAnn Elizabeth Faidley and published by . This book was released on 2006 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Ferromagnetic Shape Memory Alloys (FSMAs) in the Nickel-Manganese-Gallium system have been shown to exhibit large magnetically induced strains of up to 9.5% due to magnetically driven twin variant reorientation. In order for these strains to be reversible, restoring stresses or magnetic fields need to be applied orthogonal to the drive field. This leads to a typical implementation of Ni Mn-Ga in applications involving the use of electromagnets, which tend to be heavy, bulky and narrowband. This dissertation presents the investigation of the behavior of Ni50]Mn2.--Ga21.3 in a unique configuration in which a magnetic field produced by a solenoid is applied along the axis of a cylindrical rod and the strain is measured collinearly to the field while axial loads are applied. A strain mechanism is proposed where imperfections and inclusions in the sample create internal stresses that provide the restoring forces while also limiting the maximum strain from the sample by limiting the motion of the twin boundaries. This mechanism explains the presence and reduced magnitude of the -0.41% quasi-static strain that has been measured in this sample in the collinear configuration. This dissertation also expands the experimental testing of Ni-Mn-Ga into the dynamic domain most usually found in applications through a set of swept-sine tests. These tests demonstrate a 250% shift of elastic modulus with applied dc bias field that makes these materials extremely promising for variable stiffness applications. Finally, this document presents a model for the strain of Ni-Mn-Ga. A Gibb's Free Energy approach is used to describe an idealized hysteresis kernel that does not account for the inhomogeneities in pinning site strength and internal field. A stochastic homogenization method is then implemented that estimates the inhomogeneities as probability distributions. The implementation and testing of this model is discussed in detail and results showing simulations that fall within 3% of the data are presented demonstrating the power of this method for future design and control of applications for Ni-Mn-Ga in solenoid based transducers.
Book Synopsis Training, Microstructure, and Magneto-mechanical Properties of Ni-Mn-Ga Magnetic Shape-memory Alloys by : Markus Chmielus
Download or read book Training, Microstructure, and Magneto-mechanical Properties of Ni-Mn-Ga Magnetic Shape-memory Alloys written by Markus Chmielus and published by . This book was released on 2007 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
