scholarly journals Magnetorheological elastomers berbasis lateks cair sebagai matriks utama

2019 ◽  
Vol 14 (2) ◽  
pp. 64
Author(s):  
Virel Wibawa ◽  
U Ubaidillah

Kajian ini membahas MRE Isotropic bermatriks lateks dengan variasi fraksi massa CI particle (wt%) dan mengevaluasi karakteristik yang ditentukan, meliputi densitas, kekerasan, tegangan putus, perpanjangan putus dan swelling dari MRE yang dibuat dengan matrik lateks pekat yang berbeda-beda nilai perbandingan massa antara CI particle dan lateks pekat pada saat pencampuran. Komposisi MRE yang dibuat yaitu 0, 30, 40, 50, 60, 70 wt%, dilakukan di Laboratorium Pusat Penelitan Karet Indonesia yang memiliki alat uji karet yang sudah terstandarisasi untuk pengujian nilai tarik, keras dan swelling di Indonesia. Lateks murni dengan massa jenis 0,94 gr/cm3, terjadi peningkatan lebih dari 100% dengan penambahan CI particle 40%. Peningkatan jumlah CI particle juga meningkatan nilai keras yang semula nilai keras 35 point meningkat 15 point saat penambahan CI particle 70%. Penambahan CI particle menyebabkan penurunan hasil pengujian Tarik, terlihat saat lateks murni memperoleh hasil tegangan tarik 14,5 MPa dan perpanjangan putus mencapai 760%. Saat ditambahkan CI particle 70% tegangan putus menjadi turun mencapai 2 MPa dan perpanjangan putus 610%. Perubahan volume pada saat perendaman dengan larutan ASTM OIL 3 terlihat pada lateks murni yang mengalami penambahan volume 167,94% dan meningkat hampir 100% saat ditambahkan CI particle 70% menjadi 305,97%.

2021 ◽  
Vol 57 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Hossein Vatandoost ◽  
Subhash Rakheja ◽  
Ramin Sedaghati ◽  
Masoud Hemmatian

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1597
Author(s):  
Arturo Tagliabue ◽  
Fernando Eblagon ◽  
Frank Clemens

Magnetorheological elastomers (MRE) are increasing in popularity in many applications because of their ability to change stiffness by applying a magnetic field. Instead of liquid-based 1 K and 2 K silicone, thermoplastic elastomers (TPE), based on styrene-butadiene-styrene block copolymers, have been investigated as matrix material. Three different carbonyl iron particles (CIPs) with different surface treatments were used as magneto active filler material. For the sample fabrication, the thermoplastic pressing method was used, and the MR effect under static and dynamic load was investigated. We show that for filler contents above 40 vol.-%, the linear relationship between powder content and the magnetorheological effect is no longer valid. We showed how the SiO2 and phosphate coating of the CIPs affects the saturation magnetization and the shear modulus of MRE composites. A combined silica phosphate coating resulted in a higher shear modulus, and therefore, the MR effect decreased, while coating with SiO2 only improved the MR effect. The highest performance was achieved at low deformations; a static MR effect of 73% and a dynamic MR effect of 126% were recorded. It was also shown that a lower melting viscosity of the TPE matrix helps to increase the static MR effect of anisotropic MREs, while low shear modulus is crucial for achieving high dynamic MR. The knowledge from TPE-based magnetic composites will open up new opportunities for processing such as injection molding, extrusion, and fused deposition modeling (FDM).


2017 ◽  
Vol 177 ◽  
pp. 324-330 ◽  
Author(s):  
Mateusz Kukla ◽  
Jan Górecki ◽  
Ireneusz Malujda ◽  
Krzysztof Talaśka ◽  
Paweł Tarkowski

2013 ◽  
Vol 7 (3) ◽  
pp. 131-134 ◽  
Author(s):  
Mirosław Bocian ◽  
Jerzy Kaleta ◽  
Daniel Lewandowski ◽  
Michał Przybylski

Abstract Magnetorheological elastomers (MRE) are “SMART” materials that change their mechanical properties under influence of magnetic field. Thanks to that ability it is possible to create adaptive vibration dampers based on the MRE. To test vibration damping abilities of this material special test stand is required. This article presents design concept for such test stand with several options of testing.


2015 ◽  
Vol 133 (13) ◽  
pp. n/a-n/a ◽  
Author(s):  
Raa Khimi Shuib ◽  
Kim Louise Pickering

Author(s):  
SHULEI SUN ◽  
XIONGQI PENG ◽  
ZAOYANG GUO

Polymer matrix filled with ferromagnetic particles is a class of smart materials whose mechanical properties can be changed under different magnetic field. They are usually referred to as magnetorheological elastomers (MREs). A finite element simulation was presented to describe the mechanical behavior of MREs with the nonlinearity of the particle magnetization being incorporated. By introducing the Maxwell stress tensor, a representative volume element (RVE) was proposed to calculate the Young's modulus and shear modulus of MREs due to the applied magnetic field. The influences of the applied magnetic field and the particle volume fractions in the shear modulus and Young's modulus were studied. Results show that the shear modulus increases with the magnitude of the applied magnetic field, while the Young's modulus decreases.


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