Rheological properties magnetically elastic material samples under extreme compression modes

Self Cite

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: Findings and Possible Research Directionsmentioning

confidence: 99%

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

Minaev

2024

Self Cite

RETRACTED: Tensile testing of composite elastomer specimen

Minaev

2024

Composite elastomers are polymers capable of large reversible highly elastic deformations over a wide temperature range. Production of elastomeric composite materials is one of the intensively developing areas of industry and science, the aim of which is to find materials ready to work in both domestic and extreme operating conditions. When creating new composite polymers, magnetically active elastomers, there are a number of physical and mechanical requirements for material characteristics that need to be checked on testing machines during tensile and compressive testing of specimens. These requirements include: elasticity, insignificant residual deformations under various test modes up to material rupture in tension. The specified requirements were tested on an automated testing machine in various modes. The diagrams of linear and nonlinear characteristics of tensile stresses of the specimen depending on the strain values up to the moment of its rupture were constructed and analyzed. The analysis of the constructed hysteresis loops at stretching - contraction of the specimen showed the possibility of its use as a shock-absorbing material. Establishing the relationship between the tensile forces and the resulting deformations, including the effect of a strong magnetic field on the material, is important for further work on selecting the most appropriate range of use of this material for various conditions of its application.

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.