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Research Papers: Friction & Wear

Friction and Wear Characteristics of Magneto-Rheological Elastomers Based on Silicone/Polyurethane Hybrid

[+] Author and Article Information
Chenglong Lian, Kwang-Hee Lee

Department of Mechanical Engineering,
Inha University,
253 Yonghyeon-dong,
Nam-gu, Incheon 402-751, South Korea

Chul-Hee Lee

Department of Mechanical Engineering,
Inha University,
253 Yonghyeon-dong,
Nam-gu, Incheon 402-751, South Korea
e-mail: chulhee@inha.ac.kr

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 5, 2014; final manuscript received February 24, 2015; published online April 15, 2015. Assoc. Editor: George K. Nikas.

J. Tribol 137(3), 031607 (Jul 01, 2015) (7 pages) Paper No: TRIB-14-1248; doi: 10.1115/1.4029942 History: Received October 05, 2014; Revised February 24, 2015; Online April 15, 2015

The friction and wear properties of four different types of magneto-rheological (MR) elastomer were investigated. The MR elastomers have different matrix materials and structures. Most MR elastomers have a silicone matrix, since it has a more significant MR effect under a magnetic field compared to other materials. The mechanical properties of silicone, however, are poor compared to other materials, so it is difficult to use them in engineering applications. Therefore, a new polyurethane matrix material was used to enhance the friction and wear properties of MR elastomer. Additionally, two different matrix materials (silicone and polyurethane) were synthesized, and MR elastomers were structurally combined to improve the friction and wear performance. The friction characteristics of each MR elastomer were evaluated under reciprocating operating conditions. Wear depth was also measured to estimate the wear resistance. The test results show that the friction and wear performance of the modified MR elastomers are enhanced compared with the silicone-based MR elastomer.

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Figures

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Fig. 1

The structure of developed MR elastomers: (a) Si-MR elastomer; (b) Pu-MR elastomer; (c) Pu/Si-MR elastomer; and (d) Pu/w/Si-MR elastomer

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Fig. 2

SEM image of the Pu-MR elastomer

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Fig. 3

Dimensions of MR elastomer specimen

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Fig. 4

Synthesis of polyurethane composites with silicone

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Fig. 5

(a) Schematic diagram of reciprocating friction tester and (b) apparatus of reciprocating friction tester

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Fig. 6

SEM image of (a) Pu-MR elastomer and (b) Pu/Si-MR elastomer

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Fig. 7

Hardness of MR elastomers

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Fig. 8

Results of friction coefficient: (a) magnetic field off and (b) magnetic field on

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Fig. 9

Result of average friction coefficient

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Fig. 10

Result of wear depth

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Fig. 11

Surface state images after tests. (a)–(d) Si-MR elastomer, Pu-MR elastomer, Pu/Si-MR elastomer, and Pu/w/Si-MR elastomer without a magnetic field. (e)–(h) Si-MR elastomer, Pu-MR elastomer, Pu/Si-MR elastomer, and Pu/w/Si-MR elastomer with a magnetic field.

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