Microstructural behavior of magnetorheological elastomer undergoing durability evaluation by stress relaxation

被引：18

作者：

Johari, Mohd Aidy Faizal ^{[1
]}

Mazlan, Saiful Amri ^{[1
]}

Nasef, Mohamed Mahmoud ^{[2
]}

Ubaidillah, U. ^{[3
]}

Nordin, Nur Azmah ^{[1
]}

Aziz, Siti Aishah Abdul ^{[1
]}

Johari, Norhasnidawani ^{[1
]}

Nazmi, Nurhazimah ^{[1
]}

机构：

[1] Univ Teknol Malaysia, Int Inst Technol MJIIT, Engn Mat & Struct eMast Ikhoza, Kuala Lumpur 54100, Malaysia

[2] Univ Teknol Malaysia, Ctr Hydrogen Energy, Inst Future Energy, Adv Mat Res Grp, Kuala Lumpur 54100, Malaysia

[3] Univ Sebelas Maret, Fac Engn, Mech Engn Dept, J1 Ir Sutami 36A, Surakarta 57126, Central Java, Indonesia

来源：

SCIENTIFIC REPORTS | 2021年 / 11卷 / 01期

关键词：

FORCE; MICROSCOPY; MODEL;

D O I：

10.1038/s41598-021-90484-0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The widespread use of magnetorheological elastomer (MRE) materials in various applications has yet to be limited due to the fact that there are substantial deficiencies in current experimental and theoretical research on its microstructural durability behavior. In this study, MRE composed of silicon rubber (SR) and 70 wt% of micron-sized carbonyl iron particles (CIP) was prepared and subjected to stress relaxation evaluation by torsional shear load. The microstructure and particle distribution of the obtained MRE was evaluated by a field emission scanning electron microscopy (FESEM). The influence of constant low strain at 0.01% is the continuing concern within the linear viscoelastic (LVE) region of MRE. Stress relaxation plays a significant role in the life cycle of MRE and revealed that storage modulus was reduced by 8.7%, normal force has weakened by 27%, and stress performance was reduced by 6.88% along approximately 84,000 s test duration time. This time scale was the longest ever reported being undertaken in the MRE stress relaxation study. Novel micro-mechanisms that responsible for the depleted performance of MRE was obtained by microstructurally observation using FESEM and in-phase mode of atomic force microscope (AFM). Attempts have been made to correlate strain localization produced by stress relaxation, with molecular deformation in MRE amorphous matrix. Exceptional attention was focused on the development of molecular slippage, disentanglement, microplasticity, microphase separation, and shear bands. The relation between these microstructural phenomena and the viscoelastic properties of MRE was diffusely defined and discussed. The presented MRE is homogeneous with uniform distribution of CIP. The most significant recent developments of systematic correlation between the effects of microstructural deformation and durability performance of MRE under stress relaxation has been observed and evaluated.

引用

页数：17

共 47 条

[1] Single and double-step stress relaxation and constitutive modeling of viscoelastic behavior of swelled and un-swelled natural rubber loaded with carbon black [J].