The dynamic compressive properties of magnetorheological plastomers: enhanced magnetic-induced stresses by non-magnetic particles
TL;DR: In this article, a series of hollow glass powder (HGP) reinforced magnetorheological plastomers (MRPs) were prepared to improve the impact resistance of the materials, and the dynamic compressive properties of MRPs under high strain rate were investigated by using a split Hopkinson pressure bar (SHPB) system equipped with a customized magnetic device.
About: This article is published in Journal of Materials Science & Technology.The article was published on 2022-03-10. It has received 9 citations till now. The article focuses on the topics: Materials science & Magnetorheological fluid.
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TL;DR: In this paper , the deformation-dependent magneto-mechanical properties of magnetorheological gel (MRG) under different working modes, i.e., quasi-static and dynamic, have been systematically analyzed and compared.
Abstract: Controlled over an external magnetic field, rheological response of magnetorheological gel (MRG), a smart composite that could change according to a specific stimulation, could be reversible and adjustable. This paper sheds light on the large deformation-dependent magneto-mechanical property of MRG under different working mode, i.e. quasi-static and dynamic mode, which has rarely been systematically analyzed and compared. The viscoelastic and hysteretic properties of MRG were evaluated by three kinds of experiments that were conducted under different strain excitations—linearly monotonic and cyclic strain, and harmonically cyclic strain. The results reveal that shear stress and normal stress display opposite trend with the increase of strain under quasi-static monotonic loading. A simple parametric model is proposed to describe the shear stress of MRG under quasi-static loading. Furthermore, for quantitatively characterizing the Payne effect of MRG under dynamic loading, the classical Maier-Goritz model predicting the Payne effect of material was modified by introducing a magnetic dipole theory that considers the effect of magnetic field on Payne effect. The magnetic dipole theory is established based on triangular double-chain rather than the conventional single chain. Moreover, in the presence of a magnetic field, the hysteretic loop of MRG would occur a overshoot phenomenon under dynamic working mode, which could not been found under quasi-static cyclic mode. Also, dynamic loading, compared with quasi-static one, could enable MRG to dissipate more energy. This paper is possibly conducive to understanding the working mechanisms about microstructures of MRG and designing MRG-based vibration control devices.
7 citations
TL;DR: In this paper, the effect of secondary particles on mechanical properties of MRPs with three kinds of secondary particle were investigated and their mechanical properties were systemically investigated, which showed that the incorporation of glass balls (20 μm in diameter) led to an increase in the mechanical properties and that SiO2 and Fe3O4 particles showed a conflicting behavior.
Abstract: Magnetorheological plastomers (MRPs) with two different types of fillers have attracted considerable attention for various advantages. However, the effect of secondary particles on mechanical properties is still under controversy due to its conflicting behaviors. In this work, MRPs with three kinds of secondary particles were prepared and their mechanical properties were systemically investigated. The experimental results showed the incorporation of glass balls (20 μm in diameter) led to an increase in the mechanical properties. By contrast, SiO2 and Fe3O4 particles (1 μm in diameter) showed a conflicting behavior. With the increase of secondary particle content, for MRP with SiO2, the storage modulus first increased and then decreased. But for MRP with Fe3O4, the storage modulus first decreased slightly and then increased. At last, the microstructures in MRPs were simulated by a particle-level dynamic method to investigate the effect of secondary particles on the microstructure and mechanical properties of MRPs.
2 citations
TL;DR: In this article , the effect of secondary particles on mechanical properties of MRPs with three kinds of secondary particle were investigated and their mechanical properties were systemically investigated, which showed that the incorporation of glass balls (20 μm in diameter) led to an increase in the mechanical properties and that SiO2 and Fe3O4 particles showed a conflicting behavior.
Abstract: Magnetorheological plastomers (MRPs) with two different types of fillers have attracted considerable attention for various advantages. However, the effect of secondary particles on mechanical properties is still under controversy due to its conflicting behaviors. In this work, MRPs with three kinds of secondary particles were prepared and their mechanical properties were systemically investigated. The experimental results showed the incorporation of glass balls (20 μm in diameter) led to an increase in the mechanical properties. By contrast, SiO2 and Fe3O4 particles (1 μm in diameter) showed a conflicting behavior. With the increase of secondary particle content, for MRP with SiO2, the storage modulus first increased and then decreased. But for MRP with Fe3O4, the storage modulus first decreased slightly and then increased. At last, the microstructures in MRPs were simulated by a particle-level dynamic method to investigate the effect of secondary particles on the microstructure and mechanical properties of MRPs.
2 citations
TL;DR: In this paper , the performance of a magnetorheological plastomer (MRP) damper with different annular shear gap sizes was analyzed using finite element analysis (FEA) and computational fluid dynamics (CFD).
1 citations
TL;DR: In this paper , an integrated model of computational fluid mechanics (CFD) and finite element analysis (FEA) is used to investigate the dynamic characteristics and the controllable damping force of shearmode MRP dampers.
1 citations
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TL;DR: In this article, a magnetorheological plastomer (MRP) was developed by dispersing iron particles into a plastic polyurethane (PU) matrix, and the dynamic properties of the MRP material were systematically tested and the influences of the iron particle content and magnetic field were analyzed.
Abstract: A novel high-performance magnetorheological material, named as magnetorheological plastomer (MRP), was developed by dispersing iron particles into a plastic polyurethane (PU) matrix. The dynamic properties (including storage modulus and loss factor) of the MRP material were systematically tested and the influences of the iron particle content and magnetic field were analyzed. It is found that the anisotropic MRP product with 80% iron particle weight fraction (A-MRP-80), shows a high dynamic property: the maximum magneto-induced storage modulus is 6.54 MPa; the relative MR effect reaches as high as 532%; the loss factor can be reduced to 0.03 by adjusting magnetic field. This kind of MRP shows a much higher magnetorheological performance than the previously reported magnetorhelogical elastomer (MRE). The mechanism for its high MR performance was proposed and the influence of the iron particle distribution and temperature on the dynamic properties were discussed.
144 citations
TL;DR: In this paper, the authors present various control strategies for application systems utilizing smart magneto-rheological fluid (MRF) and magneto rheological elastomers (MRE).
Abstract: This review presents various control strategies for application systems utilizing smart magneto-rheological fluid (MRF) and magneto-rheological elastomers (MRE). It is well known that both MRF and MRE are actively studied and applied to many practical systems such as vehicle dampers. The mandatory requirements for successful applications of MRF and MRE include several factors: advanced material properties, optimal mechanisms, suitable modeling, and appropriate control schemes. Among these requirements, the use of an appropriate control scheme is a crucial factor since it is the final action stage of the application systems to achieve the desired output responses. There are numerous different control strategies which have been applied to many different application systems of MRF and MRE, summarized in this review. In the literature review, advantages and disadvantages of each control scheme are discussed so that potential researchers can develop more effective strategies to achieve higher control performance of many application systems utilizing magneto-rheological materials.
126 citations
TL;DR: In this article, the static and dynamic properties of magnetorheological elastomers (MREs) were evaluated in shear mode as a function of the magnetic flux density, and the particular MRE sample with highest iron particles content (40% volume fraction) was chosen for subsequent dynamic characterizations under broad ranges shear strain amplitude (2.5-20%), excitation frequency (0.1-50) and applied magnetic flux densities (0-450mT).
Abstract: Magnetorheological elastomers (MREs) are novel class of magneto-active materials comprised of micron-sized ferromagnetic particles impregnated into an elastomeric matrix, which exhibit variable stiffness and damping properties in a reversible manner under the application of an external magnetic field. Characterization of highly complex behavior of these active composites is a fundamental necessity to design adaptive devices based on the MREs. This study is mainly concerned with in-depth experimental characterizations of static and dynamic properties of different types of MREs using methods defined in related standards. For this purpose, six different types of MRE samples with varying contents of rubber matrix and ferromagnetic particles were fabricated. The static characteristics of the samples were experimentally evaluated in shear mode as a function of the magnetic flux density. The particular MRE sample with highest iron particles content (40% volume fraction) was chosen for subsequent dynamic characterizations under broad ranges shear strain amplitude (2.5–20%), excitation frequency (0.1–50 Hz) and applied magnetic flux densities (0–450 mT). The results revealed nearly 1672% increase in the MRE storage modulus under the application of a magnetic flux of 450 mT, which confirms the potential of the novel fabricated MRE for control of vibration and noise in various engineering applications.
99 citations
TL;DR: This work presents a soft magnetic shape-memory composite produced by encasing liquid droplets of magneto-rheological fluid into a poly(dimethylsiloxane) matrix, which undergoes an exceptional stiffening transition, with an almost 30-fold increase in shear modulus.
Abstract: With a specific stimulus, shape-memory materials can assume a temporary shape and subsequently recover their original shape, a functionality that renders them relevant for applications in fields such as biomedicine, aerospace, and wearable electronics. Shape-memory in polymers and composites is usually achieved by exploiting a thermal transition to program a temporary shape and subsequently recover the original shape. This may be problematic for heat-sensitive environments, and when rapid and uniform heating is required. In this work, a soft magnetic shape-memory composite is produced by encasing liquid droplets of magneto-rheological fluid into a poly(dimethylsiloxane) matrix. Under the influence of a magnetic field, this material undergoes an exceptional stiffening transition, with an almost 30-fold increase in shear modulus. Exploiting this transition, fast and fully reversible magnetic shape-memory is demonstrated in three ways, by embossing, by simple shear, and by unconstrained 3D deformation. Using advanced synchrotron X-ray tomography techniques, the internal structure of the material is revealed, which can be correlated with the composite stiffening and shape-memory mechanism. This material concept, based on a simple emulsion process, can be extended to different fluids and elastomers, and can be manufactured with a wide range of methods.
95 citations
TL;DR: In this paper, a novel magnetorheological elastomer (MRE) containing polyaniline (PANI)-modified CIPs was used to improve the interface between the carbonyl iron particles and polyurethane/epoxy resin IPNs matrix.
92 citations