Sensing strain with Ni-Mn-Ga

Hobza, Anthony; Patrick, Charles L.; Ullakko, K.; Rafla, Nader; Lindquist, Paul; Müllner, Peter

doi:10.1016/j.sna.2017.11.002

Cited by 48 publications

(10 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A number of researchers have assessed the electrical resistivity-based self-sensing potential of SMAs (Dhanalakshmi, 2017; Gurley et al, 2017; Hobza et al, 2018; Lan et al, 2011; Lan and Fan, 2010; Zhang et al, 2013). Wu et al (1999) investigated the electrical resistance response of SMA wires with 0.5 mm diameter subjected to a single loading cycle with a 3% strain at various temperatures.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical and electrical response of a superelastic NiTi shape memory alloy cable

Sherif

Ozbulut

2020

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

Superelastic shape memory alloys are a unique class of smart materials that can recover up to 6% strains. Due to their appealing properties such as high energy dissipation and corrosion resistance, several researchers have assessed the use of such materials in numerous applications ranging from biomedical to civil engineering. This article investigates the thermomechanical and electrical response of a NiTi shape memory alloy cable with a complex configuration subjected to cyclic loading of various strain amplitudes ranging from 3% to 7%. The cable consists of several multi-layered strands with a cumulative outer diameter of 5.5 mm. The thermomechanical results indicate a good correlation of the change in cable temperature with the applied strains and maximum stresses. The temperature history can be used to map the degradation pattern of the shape memory alloy cable. In addition, due to the complex geometry of the cable, the global electrical resistance change does not predict the strain/stress state of the cable; however, it can be used to predict the onset of phase transformations.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermomechanical and electrical response of a superelastic NiTi shape memory alloy cable

Sherif

Ozbulut

2020

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

show abstract

“…MSM alloys do not exhibit this disadvantage and respond fast to magnetic fields, with a reaction time of several milliseconds [11]; thus, they are potential candidates for application in electromagnetic actuators, sensors, and energy harvesters [12]. Furthermore, the smart properties of MSM alloys enable the design of self-sensing actuators which can be controlled by monitoring the state of the MSM element without the use of additional sensors [13], [14]. This simplifies the actuator system, as compared to traditional camera actuator technology [15].…”

Section: A Magneto-mechanical Response Of Msm Alloysmentioning

confidence: 99%

Next Generation Autofocus and Optical Image Stabilization System for Camera Modules Using Magnetic Shape Memory Actuators

Gabdullin

Ahmad

2020

IEEE Access

View full text Add to dashboard Cite

Currently, camera modules are used in a wide range of applications ranging from micropositioning actuator systems used in smartphones to larger modules used in stationary cameras, CCTV, and others. Modern camera modules are required to perform positioning functions to improve the stability and quality of captured images. These functions mainly include the autofocus (AF) and optical image stabilization (OIS) functions. Traditionally, separate actuators and sensors are used for AF and OIS, each contributing towards energy consumption, module size, and manufacturing costs. This is particularly disadvantageous in the case of smartphones owing to their inherent space and battery charge limitations. This paper presents a novel Magnetic Shape Memory (MSM) actuator system that combines the AF and OIS functions, which are performed using two actuators; thus, this system is a simple, compact, and costeffective solution to the drawbacks of conventional technology. Furthermore, the smart properties of MSM alloys reduce the energy consumption of these systems through the utilization of their inherent holding forces and the associated shape memory effect. The realization of AF and OIS functions is discussed and verified experimentally for the proposed actuator system using data obtained from a fabricated prototype.

show abstract

“…Heusler-type ferromagnetic shape memory alloys (FeSMAs) based on the NiMnGa system are a class of smart environment-friendly materials that have received increasing attention since the 1990s [ 1 , 2 , 3 , 4 ]. Due to their peculiar magneto-mechanical properties, these alloys can find potential applications in the fields of magnetic refrigeration, actuators, sensors and energy harvesters [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. In particular, FeSMAs alloys exhibit the so-called giant magnetocaloric effect thanks to the strong coupling between magnetic and elastic degrees of freedom, which can be optimized by tuning the thermoelastic martensitic transition (TMT) through doping with an additive metallic element to overlap with the magnetic transition temperature [ 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Elastocaloric Properties of Polycrystalline Samples of NiMnGaCu Ferromagnetic Shape Memory Alloy under Compression: Effect of Improvement of Thermoelastic Martensitic Transformation

Villa

Bestetti²,

Frigerio³

et al. 2022

Materials

View full text Add to dashboard Cite

Shape memory alloys (SMAs) and ferromagnetic shape memory alloys (FeSMAs) have recently attracted interest for solid state refrigeration applications. Among NiMnGa-based quaternary systems, NiMnGaCu exhibits an interesting giant magnetocaloric effect thanks to the overlapping of the temperatures related to the magnetic transition and the thermoelastic martensitic transformation (TMT); in particular, for compositions with Cu content of approximately 6 at%. In the present work, we investigated the improvement effect of TMT on the total entropy change (DS) in the elastocaloric performances of polycrystalline Ni50Mn18.5Cu6.5Ga25 at% alloy samples, just above room temperature. We report an extensive calorimetric and thermomechanical characterization to explore correlations between microstructural properties induced by the selected thermal treatment and elastocaloric response, aiming at providing the basis to develop more efficient materials based on this quaternary system. Both DT and DS values obtained from mechanical curves at different temperatures and strain recovery tests under fixed load vs T were considered. Maximum values of DS = 55.9 J/KgK and DT = 4.5 K were attained with, respectively, a stress of 65 MPa and strain of 4%. The evaluation of the coefficient of performance (COP) was carried out from a cyclic test.

show abstract

Sensing strain with Ni-Mn-Ga

Cited by 48 publications

References 22 publications

Thermomechanical and electrical response of a superelastic NiTi shape memory alloy cable

Thermomechanical and electrical response of a superelastic NiTi shape memory alloy cable

Next Generation Autofocus and Optical Image Stabilization System for Camera Modules Using Magnetic Shape Memory Actuators

Elastocaloric Properties of Polycrystalline Samples of NiMnGaCu Ferromagnetic Shape Memory Alloy under Compression: Effect of Improvement of Thermoelastic Martensitic Transformation

Contact Info

Product

Resources

About