Fabrication and characterisation of short fibre reinforced elastomer composites for bending and twisting magnetic actuation

Stanier, D. C.; Ciambella, Jacopo; Rahatekar, Sameer S.

doi:10.1016/j.compositesa.2016.10.001

Cited by 52 publications

(56 citation statements)

References 37 publications

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“…This finding indeed confirms the results of other experiments carried out with a different technique in [28]. Moreover, it is shown that anisotropic susceptibility increases quadratically with the fibre aspect ratio within the investigated range (10 < aspect ratio < 50).…”

Section: Discussionsupporting

confidence: 81%

“…Magnetic fields up to 1 T can be generated in a normal lab environment through the proper assembly of neodymium magnets [28] without using large and complex electromagnets. In this sense, Eq.…”

Section: Theorymentioning

confidence: 99%

“…First of all, magnetic forces are contactless volume forces which do not produce any chemical alteration in the material and allow the remote orientation of anisotropic particles in 3D spatial configurations [20,26]. Second, permanent magnets and electromagnets are nowadays readily available and produce strong enough fields to orient the reinforcements and eventually actuate the composite [28]. Finally, compared to electric fields, magnetic fields are not sensitive to surface charge and pH [23].…”

Section: Introductionmentioning

confidence: 99%

“…Once the fibres are aligned to the magnetic field lines they can in turn offer control of the material properties, such as the mechanical performance 3 [28], thermal stability [4,11], energy dissipation [3], electrical conductivity [18,22,17] and even magnetic actuation [14,28]. However, the performance of the material depends critically on the degree of orientation; which is in turn dependent not only on the magnetic field strength applied but also on the size, shape, volume [6] and magnetic properties of reinforcing filler used, as well as the curing rate and viscosity of the matrix [1].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic alignment of short carbon fibres in curing composites

Ciambella

Stanier

Rahatekar

2017

Composites Part B: Engineering

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractAlignment of magnetic particles into a viscous fluid by a homogeneous magnetic field has been studied both experimentally and theoretically, but very few studies have investigated the effects of viscosity changes on the capability of achieving complex fibre assemblies in composite materials. In this paper, we study the alignment of short carbon fibres into a viscous matrix whose viscosity is made dependent on the time, in order to simulate the curing process of the composite. A simple model is derived which gives the evolution of fibre position and orientation in terms of the external field and shows good agreement with the experimental evidence on nickel coated carbon fibres embedded in PDMS. The model is used to predict the fibre distribution at curing and hence could be a useful tool to predict the mechanical, electrical and magnetic properties of the composite. A closed form expression of the minimum magnetic field intensity necessary to achieve the * Corresponding author

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Section: Discussionsupporting

confidence: 81%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic alignment of short carbon fibres in curing composites

Ciambella

Stanier

Rahatekar

2017

Composites Part B: Engineering

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“…Von Lockette et al [45] produced a silicone elastomer reinforced with spherical rigid and soft magnetic particles and studied the bending behaviour of a specimen suspended between the platelets of an electromagnets. A similar configuration was exploited by Stanier et al [41] to study the behaviour of silicone rubber reinforced with nickel coated carbon fibres; different instability mechanisms were highlighted according to the direction of the fibres. The magnetic properties of a MRE (PDMS with carbonyl iron particles) were measured in [13], where two peculiar properties were assessed.…”

Section: Introductionmentioning

confidence: 97%

A nonlinear theory for fibre-reinforced magneto-elastic rods

2018

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We derive a model for the finite motion of a magneto-elastic rod reinforced with isotropic (spherical) or anisotropic (ellipsoidal) inclusions. The particles are assumed weakly and uniformly magnetised, rigid and firmly embedded into the elastomeric matrix. We deduce closed form expressions of the quasi-static motion of the rod in terms of the external magnetic field and of the body forces. The dependences of the motion on the shape of the inclusions, their orientation, their anisotropic magnetic properties and the Young modulus of the matrix are analysed and discussed. Two case studies are presented in which the rod is used as an actuator suspended in a cantilever configuration. This work can foster new applications in the field of soft-actuators.

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Numerical Macroscale Modeling of a Magnetized Ferromagnetic Fiber in Viscous Fluidic Environments

et al. 2023

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Herein, the experimental results of discontinuous ferromagnetic-fiber manipulation using magnetic-field interaction are presented. High-aspect-ratio steel fibers are realigned in viscous polydimethylsiloxanes (PDMSs) with electromagnets. The influence of the matrix viscosity, magnetic-field strength, and fiberaspect ratio on the dynamics of the realignment process is investigated. To predict the fiber behavior under static magnetic fields, two commonly used theoretical models (hereinafter referred to as the torque model and the exponential model) are compared to a nonlinear regression model proposed by the authors. The latter model focuses on the alignment rate of a fiber as a function of the physical process parameters. To indicate the best fitting model for the experimental results, the statistical root-mean-square error (RMSE) values of the fitted models are assessed. A total of 54 comparisons are made between the exponential model and the authors' nonlinear regression model. In 50 cases, the nonlinear regression model provides a better fit.

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Fabrication and characterisation of short fibre reinforced elastomer composites for bending and twisting magnetic actuation

Cited by 52 publications

References 37 publications

Magnetic alignment of short carbon fibres in curing composites

Magnetic alignment of short carbon fibres in curing composites

A nonlinear theory for fibre-reinforced magneto-elastic rods

Numerical Macroscale Modeling of a Magnetized Ferromagnetic Fiber in Viscous Fluidic Environments

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