Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Structural Simulation of Wrist Band for Wearable Device According to Design and Material Model

  • Kwon, Soon Yong (Samyang Central R & D Center) ;
  • Cho, Jung Hwan (Samyang Central R & D Center) ;
  • Yoo, Jin (Samyang Central R & D Center) ;
  • Cho, Chul Jin (Samyang Central R & D Center) ;
  • Cho, Sung Hwan (Samyang Central R & D Center) ;
  • Woo, In Young (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology) ;
  • Lyu, Min-Young (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology)
  • Received : 2018.11.30
  • Accepted : 2018.12.12
  • Published : 2018.12.31
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Abstract

Elastomers based on the thermoplastics are widely used in rubber industries. Thermoplastic elastomers have the advantages of an easy shaping process and elimination of recycling problems. Thermoplastic polyester elastomer (TPE) is used for making rubber bands in wearable devices and its applications are increasing. In this study, five wrist bands were designed and their mechanical behaviors were examined by computer simulation, using hyper elastic models, Mooney-Rivlin and Ogden models, and a linear elastic model. Simulation results were compared and discussed in terms of band design and material model.

Keywords

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Figure 2. Four different TPE Stress-Strain Curves. 5300NA and 5400NA has low hardness than 5550NA and 5650NA.

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Figure 3. Design models of wearable band. (a) Model 1, (b) Model 2, (c) Model 3.

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Figure 5. Detail geometry of Model 3.

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Figure 6. Boundary condition for simulation.

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Figure 7. Curve fitting TRIEL 5300NA. (a) Ogden 1st order fitting (b) Mooney-Rivlin model fitting data.

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Figure 8. Curve fitting TRIEL 5550NA. (a) Ogden 1st order fitting (b) Mooney-Rivlin model fitting data.

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Figure 9. Equivalent stress distribution by design models (TRIEL 5300NA, Displacement 3 mm, Ogden model).

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Figure 10. Equivalent stress distribution by material models (TRIEL 5300NA, Model 2, Displacement 3 mm).

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Figure 11. Equivalent stress distribution by TPE grade (Model 3, Mooney-Rivlin model, displacement 3 mm).

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Figure 12. Equivalent stress distribution by displacement (TRIEL 5300NA, Model 3, Mooney-Rivlin model).

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Figure 13. Equivalent stress distribution in Model 3 (TRIEL 5300NA, Mooney-Rivlin model, displacement 3 mm).

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Figure 14. Variation of equivalent stress for design model. (a) Model 1, (b) Model 2, (c) Model 3.

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Figure 15. Variation of equivalent stress according to material models. (a) TRIEL 5300NA, (b) TRIEL 5550NA.

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Figure 16. Variation of equivalent strain according to model. (a) Model 1, (b) Model 2, (c) Model 3.

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Figure 17. Variation of equivalent strain according to material. (a) TRIEL 5300NA, (b) TRIEL 5550NA.

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Figure 18. Variation of equivalent stress in Model 3.

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Figure 1. (a) TPC-ET(TPE) Chemical structure (b) TPC-ET semi-crystalline structure.

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Figure 4. Mesh for computer simulation.

Table 1. Hardness of TPC-ET Used in This Study

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