Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Acoustic Properties of Rubber Compound for Anechoic Coating

  • Bae, Jong Woo (Korea Institute of Footwear and Leather Technology) ;
  • Kim, Won Ho (Department of Material Engineering, Pusan National University) ;
  • Ahn, Byung Hyun (Department of Material Engineering, Pukyong National University)
  • Received : 2018.11.09
  • Accepted : 2018.11.23
  • Published : 2018.12.31
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Abstract

Three kinds of rubber compounds were prepared, and their underwater acoustical properties were investigated for anechoic coating. Dynamic mechanical properties of the rubber compounds were measured using a dynamic mechanical analyzer and extended to 100 kHz using time-temperature superposition. The sound speed, reflection coefficient, and attenuation constant were calculated. Silicone rubber showed the lowest reflection coefficient, and nitrile rubber showed the highest attenuation constant. The acoustic properties of nitrile rubber compounds with various compositions were investigated. The sound speed, reflection coefficient, and transmission coefficient of the nitrile rubber in the frequency range of 200-1000 kHz were measured in a water-filled tank.

Keywords

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Figure 1. E′ and master curves of silicon rubber (a), butyl rubber (b), and nitrile rubber (c).

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Figure 2. Sound speed of rubber compounds.

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Figure 3. Acoustic impedance of rubber compounds.

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Figure 4. Reflection coefficient of rubber compounds.

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Figure 5. Tanδ of rubber compounds.

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Figure 6. Attenuation constant of rubber compounds.

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Figure 7. Reflection coefficient (a) and attenuation constant (b) of nitrile rubber with various sulfur content.

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Figure 8. Reflection coefficient (a) and attenuation constant (b) of nitrile rubber with various carbon black content.

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Figure 9. Reflection coefficient (a) and attenuation constant (b) of nitrile rubber with various process oil content.

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Figure 10. A schematic diagram of water filled tank test apparatus.

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Figure 11. Sound speed of nitrile rubber measured in water filled tank.

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Figure 12. Reflection coefficient (a) and transmission coefficient (b) of nitrile rubber measured in water filled tank.

Table 1. The Recipe of Rubber Compounds

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Table 2. Curing Condition of Rubber Compounds

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