The shape – morphing performance of magnetoactive soft materials

Bastola, Anil K.; Hossain, Mokarram

doi:10.1016/j.matdes.2021.110172

Cited by 116 publications

(80 citation statements)

References 252 publications

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“…We apply the external magnetic field along the symmetry axis of a spheroidal MAE sample of the initial aspect ratio γ 0 and calculate the magneto-induced elongation in the applied field direction. For SCs, the values of dimensionless parameters ( f micro ) SC and (ζ) SC are positive and given by Equations ( 13) and (17), respectively. By substituting Equations ( 11) and ( 17) into (27), the corresponding Cauchy stress components can be calculated as:…”

Section: Smeared Columnsmentioning

confidence: 99%

“…Thus, these MAEs can be used in a variety of engineering applications including but not limited to actuators, adaptive engine mounts, metamaterials, artificial cilia, retina magnetic fixators, tunable vibration absorbers, long-term biofilm control, etc. [17][18][19][20][21][22][23][24]. The fabrication of such MAEs under the application of an external magnetic field rearranges the randomly distributed magnetic particles into chain-like or plane-like microstructures [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Magneto-Mechanical Enhancement of Elastic Moduli in Magnetoactive Elastomers with Anisotropic Microstructures

Chougale¹,

Romeis²,

Saphiannikova³

2022

Materials

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Magnetoactive elastomers (MAEs) have gained significant attention in recent years due to their wide range of engineering applications. This paper investigates the important interplay between the particle microstructure and the sample shape of MAEs. A simple analytical expression is derived based on geometrical arguments to describe the particle distribution inside MAEs. In particular, smeared microstructures are considered instead of a discrete particle distribution. As a consequence of considering structured particle arrangements, the elastic free energy is anisotropic. It is formulated with the help of the rule of mixtures. We show that the enhancement of elastic moduli arises not only from the induced dipole–dipole interactions in the presence of an external magnetic field but also considerably from the change in the particle microstructure.

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Section: Smeared Columnsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magneto-Mechanical Enhancement of Elastic Moduli in Magnetoactive Elastomers with Anisotropic Microstructures

Chougale¹,

Romeis²,

Saphiannikova³

2022

Materials

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“…In an external magnetic field, a compliant MAE object may change its dimensions or shape (morph) [ 22 ]. If an applied magnetic field is homogeneous, the corresponding strain during the process of magnetization is often designated as magnetostrictive strain.…”

Section: Introductionmentioning

confidence: 99%

Multiferroic Cantilevers Containing a Magnetoactive Elastomer: Magnetoelectric Response to Low-Frequency Magnetic Fields of Triangular and Sinusoidal Waveform

Glavan

Belyaeva

Shamonin

2022

Sensors

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In this work, multiferroic cantilevers comprise a layer of a magnetoactive elastomer (MAE) and a commercially available piezoelectric polymer-based vibration sensor. The structures are fixed at one end in the horizontal plane and the magnetic field is applied vertically. First, the magnetoelectric (ME) response to uniform, triangle-wave magnetic fields with five different slew rates is investigated experimentally. Time and field dependences of the generated voltage, electric charge, and observed mechanical deflection are obtained and compared for four different thicknesses of the MAE layer. The ME responses to triangular and sinusoidal wave excitations are examined in contrast. Second, the ME response at low frequencies (≤3 Hz) is studied by the standard method of harmonic magnetic field modulation. The highest ME coupling coefficient is observed in the bias magnetic field strength of ≈73 kA/m and it is estimated to be about 3.3 ns/m (ME voltage coefficient ≈ 25 V/A) at theoretically vanishing modulation frequency (f→0 Hz). Presented results demonstrate that the investigated heterostructures are promising for applications as magnetic-field sensors and energy harvesting devices.

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“…Polymeric additive manufacturing (AM) technologies are relatively recent, and their development is growing steadily. AM has mainly been used as rapid prototyping technology, but its application in manufacturing of customized end-use polymeric parts in small-series production is growing [ 1 , 2 , 3 , 4 ]. AM is a general term applied for describing production technologies that rely on the addition of material in a layer-by-layer fashion, which is opposed to the more commonly used subtractive production methods such as turning, milling, or drilling [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Setting the Optimal Laser Power for Sustainable Powder Bed Fusion Processing of Elastomeric Polyesters: A Combined Experimental and Theoretical Study

et al. 2022

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Additive manufacturing (AM) of polymeric materials offers many benefits, from rapid prototyping to the production of end-use material parts. Powder bed fusion (PBF), more specifically selective laser sintering (SLS), is a very promising AM technology. However, up until now, most SLS research has been directed toward polyamide powders. In addition, only basic models have been put forward that are less directed to the identification of the most suited operating conditions in a sustainable production context. In the present combined experimental and theoretical study, the impacts of several SLS processing parameters (e.g., laser power, part bed temperature, and layer thickness) are investigated for a thermoplastic elastomer polyester by means of colorimetric, morphological, physical, and mechanical analysis of the printed parts. It is shown that an optimal SLS processing window exists in which the printed polyester material presents a higher density and better mechanical properties as well as a low yellowing index, specifically upon using a laser power of 17–20 W. It is further highlighted that the current models are not accurate enough at predicting the laser power at which thermal degradation occurs. Updated and more fundamental equations are therefore proposed, and guidelines are formulated to better assess the laser power for degradation and the maximal temperature achieved during sintering. This is performed by employing the reflection and absorbance of the laser light and taking into account the particle size distribution of the powder material.

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The shape – morphing performance of magnetoactive soft materials

Cited by 116 publications

References 252 publications

Magneto-Mechanical Enhancement of Elastic Moduli in Magnetoactive Elastomers with Anisotropic Microstructures

Magneto-Mechanical Enhancement of Elastic Moduli in Magnetoactive Elastomers with Anisotropic Microstructures

Multiferroic Cantilevers Containing a Magnetoactive Elastomer: Magnetoelectric Response to Low-Frequency Magnetic Fields of Triangular and Sinusoidal Waveform

Setting the Optimal Laser Power for Sustainable Powder Bed Fusion Processing of Elastomeric Polyesters: A Combined Experimental and Theoretical Study

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