The Effect of Repetitive Compression with Constant Stress on the Compressive Properties of Foams

일정 응력 반복압축이 발포체의 압축 특성에 미치는 영향

  • 박차철 (동서대학교 응용생명공학부)
  • Published : 2005.12.31

Abstract

To study the compressive stress, recovery force and permanent strain of foams for footwear midsole, polyurethane(PU), phylon(PH) and injection phylon(IP) foams were repetitively compressed with constant compressive stress. Maximum compressive stress of PU did not decrease with repetitive compression on the constant compressive stress, but that of IP largely decreased. Engineering strain of foams were formed by repetitively compressing the three types of foam. The engineering strain of PU was smaller than that of IP and PH. Compressive stress and recovery force of IP and PH at certain strain were decreased with repetitive compression, but that of PU was not noticeably changed.

References

  1. C. C. Park, 'The Effects of Hardness on the Compression-Rebounding Properties of Shoes Midsole', Elastomer, 39, 186 (2004)
  2. N. J. Mills, C. Fitzgerald, A. Gilchrist and R. Verdejo, 'Polymer Foams for Personal Protection: Cushion, Sshoes and Helmets', Composites Science and Technology, 63, 2389-2400 (2003) https://doi.org/10.1016/S0266-3538(03)00272-0
  3. R. Dubois, S. Karande, D. P. Write, and F. Martinez, 'The Use of Ehtylene/styrene Interpolymers in Cross-linked Foams for the Footwear Industry', Annual Technical Conference, Society of Plastic Engineer, 1655-1660 (2001)
  4. Y. Zhang, D. Rodrigue and A. Ait-kadi, 'Morphology and Mechnical Properties of Foamed Polyethylene Blend', Polymers, 22(4), 211-236 (2003)
  5. J. Lee, 'Microcellular Cross-linked EVA Foam by Injection Molding Process', Annual Technical Conference, Society of Plastic Engineer, 2060-2064 (1997)
  6. G. Kotzev, 'Studies of Mechanical Properties and Melting Behaviour of Foamed and Crosslinked LDPE/PP Blends', Cellular Polymers, 21, 431-443 (2002)
  7. N. C. Hilyard, 'Mechnics of Cellular Plastics', Macmillan Publishing Co., Chap. 1, New York (1982)
  8. N. C. Hilyard and A. Cunninghan, 'Low Density Cellular Plastics', Macmillan Publishing Co., Chap. 1, New York (1982)
  9. N. C. Hilyard, 'Mechnics of Cellular Plastics', Macmillan Publishing Co., Chap. 2, New York (1982)
  10. L. J. Gibson and M F. Ashby, 'Cellular Solids', Oxford, New York (1988)
  11. C. C. Park, 'Impact and Rebounding Properties of Shoes Midsole with Temperature', Elastomer, 39, 274 (2004)