Experimental Study on the Magnetic Properties of MSMA and the Function of MSMA Actuator of Reticulated Shell Structure

2013 ◽  
Vol 846-847 ◽  
pp. 539-542
Author(s):  
Jin Sheng He ◽  
Tao Yang ◽  
She Liang Wang ◽  
Guang Yuan Weng
Keyword(s):  
Magnetic Field ◽  
Shape Memory ◽  
Shell Structure ◽  
Coupling Effect ◽  
Memory Function ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloy ◽  
Reticulated Shell Structure ◽  
Strain Model ◽  
The Magnetic Field

With shape memory function of new smart material, the magnetic control properties of magnetic shape memory alloy could be used to fabricate intelligent actuators for vibration control of reticulated shell structure. The major performance parameters of the microstructure of the materials has been considered in the functional relationship between the magnetic field and strain model of traditional magnetic shape memory alloys (MSMA). But the magnetic field of MSMA do not considered, induced strain and pre-pressure, ambient temperature and other factors, which is a mutual restraint relationship and coupling. Selected Ni53Mn25Ga22, in this paper, as the material for the research on deformation under the action of temperature, magnetic field, pressure coupling effect, and according to the test data designed a MSMA actuator drive.

Experimental Study on the Magnetic Characteristics of Magnetic Shape Memory Alloy Materials

2013 ◽  
Vol 446-447 ◽  
pp. 230-234
Author(s):  
Tao Li ◽  
She Liang Wang ◽  
Tao Yang ◽  
Guang Yuan Weng
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Constitutive Relations ◽  
Memory Function ◽  
Magnetic Characteristics ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloy ◽  
Magnetic Induction Intensity

With shape memory function of new smart material, the magnetic control properties of magnetic shape memory alloy could be used to fabricate intelligent actuators for vibration control of structures. In order to study its magnetic properties, this text selected Ni53Mn25Ga22 as the material for the research and development of actuator drive, And two MSMA test specimens were prepared for the experimental study under the coupled action of the temperature, preload pressure and magnetic field. The results showed that the strain of MSMA induced by magnetic field decreased with the increase of the preload pressure at constant magnetic field. The deformation performance was best when the magnetic induction intensity was about 0.5T. And the constitutive relations were fitted for the actuator production to lay the foundation for later.

Effects of Surface Pinning, Locking and Adaption of Twins on the Performance of Magnetic Shape-Memory Alloys

2011 ◽  
Vol 684 ◽  
pp. 177-201 ◽  
Author(s):  
Markus Chmielus ◽  
Peter Müllner
Keyword(s):  
Magnetic Field ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Surface Damage ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloys ◽  
Fatigue Lifetime ◽  
Twin Density ◽  
External Constraints ◽  
The Magnetic Field

We study the effect of surface modifications and constraints on the mechanical properties of Ni-Mn- Ga single crystals, which are imposed by (i) structural modifications near the surface, (ii) mounting to a solid surface, and (iii) guiding the stroke. Spark eroded samples were electropolished and characterized before and after each polishing treatment. Surface damage was then produced with spark erosion and abrasive wearing. Surface damage stabilizes and pins a dense twin-microstructure and prevents twins from coarsening. The density of twins increases with increasing degree of surface deformation. Twinning stress and hardening rate during mechanical loading increase with increasing surface damage and twin density. In contrast, when a damaged surface layer is removed, twinning stresses, hardening rate, and twin density decrease. Constraining the sample by mounting and guiding reduces the magnetic-field-induced strain by locking twins at the constrained surfaces. . For single-domain crystals and for hard magnetic shape-memory alloys, external constraints strongly reduce the magnetic-field-induced strain and the fatigue lifetime is short. In contrast, for selfaccommodated martensite and for soft magnetic shape-memory alloys, the twin-microstructure adapts well to external constraints and the fatigue lifetime is long. The performance of devices with MSMA transducers requires managing stress distributions through design and control of surface properties, microstructure, and constraints.

Recent Developments of Magnetic SMA

2008 ◽  
Vol 59 ◽  
pp. 1-10 ◽  
Author(s):  
Outi Söderberg ◽  
Ilkka Aaltio ◽  
Yan Ling Ge ◽  
Xu Wen Liu ◽  
Simo Pekka Hannula
Keyword(s):  
Magnetic Field ◽  
Phase Transformation ◽  
Shape Memory ◽  
Dimensional Change ◽  
Magnetic Shape Memory ◽  
Dimensional Changes ◽  
Different Types ◽  
Recent Developments ◽  
Giant Magnetocaloric Effect ◽  
The Magnetic Field

In the shape memory alloys (SMAs) the thermal triggering induces reversible dimensional change by the phase transformation – these materials may also be ferrior ferromagnetic, however, here only the ferromagnetic SMAs are discussed. In certain SMAs the austenitemartensite phase transformation is influenced by the magnetic field as either austenite or martensite is promoted by the field and this is exploited for the dimensional changes. However, in the magnetic shape memory (MSM) alloys no phase transformation occurs as the remarkable dimensional changes take place by the twin variant changes in the martensitic phase activated by the external magnetic field at constant temperature. In addition to the phase transformation or magnetic shape memory effect, the applied magnetic field may also result in the conventional magnetostriction (MS), enhance the superelasticity (magneticfieldassisted superelasticity MFAS) or induce the giant magnetocaloric effect (GMCE). Certain alloys such as NiMnGa may even be multifunctional showing more than one of these effects. The present paper gives an overview of the different types of the magnetically activated SMA alloys, their properties as well as their potentials for applications in the frameworks of the recent studies.

Hysteretic Nonlinear Model of Magnetic Shape Memory Alloy

2011 ◽  
Vol 121-126 ◽  
pp. 191-195
Author(s):  
Zhi Wen Zhu ◽  
Liang Gao ◽  
Jia Xu
Keyword(s):  
Magnetic Field ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Partial Least Square ◽  
Least Square ◽  
Hysteresis Phenomenon ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloy

In this paper, a kind of Magnetic Shape Memory Alloy (MSMA) model based on hysteretic nonlinear theory was developed. Von del Pol nonlinear difference item was introduced to interpret the hysteresis phenomenon of strain-magnetic field intensity (MFI) curve of MSMA. The final relationship among strain, stress and magnetic field intensity was obtained in partial least-square regression method to describe the variation of strain-MFI curve with stress. The result of forecast test shows that the model can describe the characteristics of MSMA in different stress well. The new MSMA model is easy to be analyzed in theory, which is helpful to application of MSMA in engineering fields.

Hysteresis effects in the magnetic-field-induced reverse martensitic transition in magnetic shape-memory alloys

2010 ◽  
Vol 108 (4) ◽  
pp. 043914 ◽  
Author(s):  
Thorsten Krenke ◽  
Seda Aksoy ◽  
Eyüp Duman ◽  
Mehmet Acet ◽  
Xavier Moya ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Martensitic Transition ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloys ◽  
The Magnetic Field

A New Type Electrohydraulic Servo Valve Based on Magnetic Shape Memory Alloy

2013 ◽  
Vol 873 ◽  
pp. 91-94
Author(s):  
Fu Quan Tu ◽  
Yang Mao ◽  
Ren Bo Xu
Keyword(s):  
Magnetic Field ◽  
Shape Memory ◽  
Functional Materials ◽  
Shape Variation ◽  
Magnetic Shape Memory ◽  
Servo Valve ◽  
Magnetic Shape Memory Alloy ◽  
New Type ◽  
Variation Mechanism ◽  
The Relationship

In this paper, the magnetically controlled characteristic and shape variation mechanism magnetic shape memory alloys (MSMA) sample are studied through the servo valve actuator based on the MSMA. The MSMA is a new type of functional materials, which has huge driving force and large controllability displacement. The kind of actuator is designed by differential mode of MSMA, employing bias coils to generate biasing magnetic field and applying field coils to provide magnetic field which is controllable. The relationship between displacement of the new actuator and time is got by numerical simulation using Maxwell software. Finally, motivated by the simulation results, the rationality of structural design of the new type of actuator is validated.

Shape Memory Effect in Fe-Pd Magnetic Shape Memory Alloy Thin Films

2010 ◽  
Vol 654-656 ◽  
pp. 2107-2110
Author(s):  
Jun Hyun Han ◽  
Tae Ahn ◽  
Hyun Kim ◽  
Kwang Koo Jee
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Stress Change ◽  
Composition Gradient ◽  
Cantilever Beams ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloy

The shape memory effect (SME) and magnetic shape memory effect (MSME) Fe-Pd thin film are using the film curvature method. The corresponding residual stress change due to theSME and MSME in Fe-Pd film is measuredduring thermal cycling and magnetic field changing. AFe-Pd thin film with a lateral composition gradient is deposited onto micromachined x7 cantilever beam arraysubstrate,such that each of the cantilever beams is coated with a film of different composition.There is abrupt stress change in only .1 at % Pd as the temperature of the film is cycled, and the corresponding stress change was measured as 0.16 GPa. The film with .4 at % Pd showsthe abrupt stress change at 0.7 Tesla, which means that the composition has the MSME.

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