Dynamic Testing of Magnetic Elastomer Material Prototypes

A sample of a magnetically active composite with ferromagnetic fillers is studied. It is known that magnetoactive composites are of interest for use in a number of fields of science and technology. The characteristics of changes in the properties of magnetoactive composites with ferromagnetic fillers in compression tests under repeated loading are poorly studied. The study in different, wide force modes of compression to establish the conditions of self-restoration of the material shape is of practical and scientific interest for further use of the tested material. The machine on which the tests are carried out allows loading and studying the character of the sample behavior from small to extreme compression forces. The possibility of preserving the shape memory effect of the test material after a long period between the first and repeated test and under the condition of exceeding the compression force of the sample almost three times compared to the first test is determined. The dependence of the change in the magnitudes of the sample deformations on the compression load is determined. The ranges of non-linear character of variation of the sample deformations from the compression force starting practically from 60% of the value of its initial deformation are shown. The sample tested under extreme compression of up to 30 kN, as well as in the initial test, demonstrated self-recovery (shape memory effect). Thus, the effect of reversible deformation after extreme loads, which exceeded the initial ones by 3 times, was confirmed.

Section: Introductionmentioning

confidence: 99%

Self-repair of magnetically active composite sample in extreme compression test

Minaev

2024

“…When investigating the dynamic properties of magnetically active elastomers on vibrodynamic test benches, it was shown that exposure of the test specimens to magnetic fields resulted in significant shifts in the resonance frequencies [9]. The developed device using the resonance frequency control system made it possible to shift the resonance frequencies and thus, reduce undesirable vibration amplitudes in the operated product [10].…”

Section: Introductionmentioning

confidence: 99%

Stress-strain magnetoactive propulsion system

Minaev

Korovkin

2023

It is possible to create deformations in magnetically active polymeric materials by applying magnetic fields to them. This work develops a symmetrical design scheme of the device, in which the drive and control are carried out by two actuators located on opposite sides. The symmetric scheme with control from two sides allows transporting objects (cargo) in mutually opposite directions (forward and backward). It is proposed to use a magnetically active gel together with a magnetically active elastomer as magnetically active materials. The resulting force effect in the device actuator is produced by interaction of magnetic fields of electromagnets with magnetic fields of permanent magnets. Expressions for obtaining alternating magnetic fields which create conditions for generating alternating magnetic forces in the actuator of the device are given. A prototype design with a controller control device in which signals are generated for an optimum current pulse generator with adjustable duty cycle and duration is presented.

Testing of magnetoactive composite under extreme compression

Minaev

2024

This article examines a sample of magnetoactive composite with ferromagnetic fillers. Magnetoactive composites, due to the uniqueness of their physico-mechanical characteristics, can find application in various areas of industrial production. Previous studies have demonstrated the potential for self-recovery of a magnetoactive material sample after the removal of extreme compression loads of 10 kN and 30 kN. The tested sample, with an elastic modulus not exceeding 20 kPa, showed the ability to self-recover, practically without destruction. In this test, the sample had elastic modulus parameters more than twice as high as in previous tests and was subjected to higher extreme loads up to 50 kN. Similar to previous tests, the sample is also evaluated for the possibility of restoring its shape. Compression force changes are established against the values of strain, ranging from zero to exceeding 90% of its initial deformation, on recorded compression diagrams of the sample presented for testing. A sharp increase in compression forces is observed at deformations exceeding 70% of its initial deformation. The tested sample, subjected to extreme loads of 50 kN, partially self-recovered and experienced partial damage.