FEM-Simulation of Magnetic Shape Memory Actuators

Schiepp, Thomas; Maier, Manuel C.; Pagounis, E.; Schluter, Andreas; Laufenberg, Marku

doi:10.1109/tmag.2013.2279205

Cited by 35 publications

(34 citation statements)

References 9 publications

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“…Since a longitudinally applied magnetic field produces a compressive stress in the MSM element (as shown in Fig. 1 (b)), the bending of magnetic field lines inside the MSM region implies production of compressive stresses along with tensile stresses acting on a twin boundary [13]. Thus, simplistic models would predict larger output stress and, hence larger output force of an actuator than a model that takes all the above effects into account.…”

Section: Discussionmentioning

confidence: 99%

“…2). Such an approach was recently developed by Schiepp et al [13]. However, the anisotropy of MSM twin variants and, hence its effects on magnetic field distribution is not captured in the existing modeling approaches.…”

Section: B Msm Microstructure and Propertiesmentioning

confidence: 99%

“…We model the twin variant distribution through breaking the MSM element into thin bands corresponding to different twin variants [13] using the known geometry of each variant [14]. Each variant is treated as anisotropic and magnetic properties are assigned according to the current orientation of crystallographic axes inside a variant.…”

Section: B Msm Microstructure and Propertiesmentioning

confidence: 99%

“…A 45 tilt of twin boundaries is an important feature of MSM twin variant geometry [13]. The field lines tend to change their direction inside the MSM element experiencing further bending on twin boundaries.…”

Section: Fig 2 Herementioning

confidence: 99%

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Study of Non-Homogeneity of Magnetic Field Distribution in Single-Crystal Ni-Mn-Ga Magnetic Shape Memory Element in Actuators due to its Anisotropic Twinned Microstructure

Gabdullin

Khan

2016

IEEE Trans. Magn.

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This is the accepted version of the paper.This version of the publication may differ from the final published version. This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Magnetic shape memory (MSM) alloys are relatively new and very promising "smart" materials which respond to magnetic fields and exhibit the shape memory effect at room temperature. Maximum strain varies from 6 to 12% of the MSM element's length depending on its microstructure. The shape memory effect and magnetic field-induced reorientation of MSM twin variants in lowtemperature martensite phase are subject to an ongoing research for almost two decades. However, the magnetic field distribution in the MSM elements and effects of its varying magnetic permeability on bias magnetic field are not well studied. In this paper we present an extension to the existing modeling approach for MSM elements applicable to actuator design. The effects arising from single-crystal anisotropy and demagnetization effects due to non-homogeneous multi-variant MSM microstructure are studied and discussed. The proposed approach is validated by comparing computational results with previously reported measurement data. Permanent repository linkIndex Terms-Magnetic shape memory (MSM) alloys, MSM actuators, electromagnetic analysis, non-homogeneous permeability, magnetic anisotropy

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Section: Discussionmentioning

confidence: 99%

Section: B Msm Microstructure and Propertiesmentioning

confidence: 99%

Section: B Msm Microstructure and Propertiesmentioning

confidence: 99%

Section: Fig 2 Herementioning

confidence: 99%

See 2 more Smart Citations

Study of Non-Homogeneity of Magnetic Field Distribution in Single-Crystal Ni-Mn-Ga Magnetic Shape Memory Element in Actuators due to its Anisotropic Twinned Microstructure

Gabdullin

Khan

2016

IEEE Trans. Magn.

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“…The actuator output characteristics are calculated using external magnetic fielddependent strain-stress curves published in [9]. The magnetomechanical behavior of the MSM element in the actuator is taken into account using an approach similar to the one proposed in [10]. This allows the design of MSM actuators taking into account change in MSM permeability which is particularly important for optimal magnetic circuit design [11].…”

Section: Large-force Actuator Design and Comparisonmentioning

confidence: 99%

Electromagnetic and Thermal Analyses of High-Performance Magnetic Shape Memory Actuators for Valve Applications

Gabdullin

Khan

2016

IEEE Trans. Magn.

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Magnetic shape memory (MSM) alloys are relatively new "smart" alloys which have enormous potential to be used in actuators, sensors and other electrical devices. Their large strain and considerable stress output can be controlled by magnetic fields or mechanical stresses. Maximum magnetic field-induced strain varies from 6 to 12% of the MSM element's length depending on its microstructure. However, very low operational temperature limit is one of the main drawbacks of conventional MSM alloys. This makes their application in high performance actuators challenging due to considerable power losses. This paper discusses different MSM actuator designs optimized particularly for large force output for pneumatic electromagnetic (EM) valve applications. The thermal problem is addressed through analyzing the heat transfer conditions of each particular design and the effects of different cooling systems. An energy-efficient operating cycle for varying actuator load that takes advantage of the shape memory effect is also proposed. This allows minimization of energy losses resulting in acceptable increase in temperature ensuring stable continuous actuation.Index Terms-Actuator design, magnetic shape memory alloys, electromagnetic analysis, thermal analysis, smart materials.

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New Insights into the Intermartensitic Transformation and Over 11% Magnetic Field‐Induced Strain in 14 m Ni−Mn−Ga Martensite

et al. 2021

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FEM-Simulation of Magnetic Shape Memory Actuators

Cited by 35 publications

References 9 publications

Study of Non-Homogeneity of Magnetic Field Distribution in Single-Crystal Ni-Mn-Ga Magnetic Shape Memory Element in Actuators due to its Anisotropic Twinned Microstructure

Study of Non-Homogeneity of Magnetic Field Distribution in Single-Crystal Ni-Mn-Ga Magnetic Shape Memory Element in Actuators due to its Anisotropic Twinned Microstructure

Electromagnetic and Thermal Analyses of High-Performance Magnetic Shape Memory Actuators for Valve Applications

New Insights into the Intermartensitic Transformation and Over 11% Magnetic Field‐Induced Strain in 14 m Ni−Mn−Ga Martensite

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