A Study on Deformation and Strength of High-Strength Polymer Composites Using Automobiles

자동차용 고강도 폴리머 복합재료의 변형과 강도에 관한 연구

Im, Jae-Gyu;Sin, Jae-Hun;Park, Han-Ju;Shoji, T.;Takeda, H.

  • Published : 2001.07.01


Nowadays study on recycling disused plastics for automobiles was lively progressed. Rubber and talcum powder was added to retrieve degradation of physical properties caused by recycling disused polypropylene. The effect of the temperature, the fatigue load and the loading speed on DEN(double edged notch) specimen which was made by the pp-rubber composites during fracture was studied by. DEN specimen was made on PP-rubber composites through the injection molding. With increasing temperature the fracture strength was linearly decreased and the fracture energy was increased by $0^{\circ}C$ and after that decreased. In the same temperature the fracture strength during increasing the notch radius was hardly increased. The fracture behaviour at low and high loading speed was different entirely. At high loading speed plastic region was small and fracture behaviour was seen to brittle fracture tendency. With increasing fatigue load fracture energy was first rapidly decreased and subsequently steady when radius of notch tip was 2mm, but Maximum load during fracture scarcely varied. The deformation mechanism of polypropylene-rubber composites during fracture was studied by SEM fractography. A strong plastic deformation of the matrix ahead of the notch/crack occurred. The deformation seem to be enhanced by a thermal blunting of the notch/crack.


PP/Rubber Composite;Load Duration Section;Notch


  1. Bartczak, Z., Argon, A.S., Cohen R.E., Weinberg, M., 1999, 'Toughness Mechanism in Semi-Crystalline Polymer Blends: I .High-Density Polyethylene Toughed with Rubbers,' Polymer, Vol. 40, pp. 2331-2346
  2. 임재규, 박한주, 김연직, 1999, '단섬유강화 PP복합재료의 강도특성에 미치는 환경영향 평가,' 대한기계학회논문집 A권, 제23권, 제5호, pp. 772-779
  3. Kinloch, A. J. and Young, R. J., 1983, 'Fracture Behavior of Polymers,' Applied Science
  4. Kaush, H. H., 1990, 'Advances in Polymer Science 52/52,' Crazing in Polymers, Springer-Verlag
  5. Pavan, A. and Mercante, L., 1991, Makromol. Chem. Macromol. Symp., Vol. 48/49, p. 221
  6. Lazzeri, A. and Bucknall, C. B., 1993, J. Mater. Sci., Vol. 28, p. 679
  7. 김상욱, 1997, '자동차 재활용의 현황과 전망,' 자동차공학회지, Vol. 19, No. 6
  8. van der Wal A., Mulder, J. J., Oderkerk J. and Gaymans R. J., 1998, 'Polypropylene-Rubber Blends: 1. The Effect of the Matrix Properties on the Impact Behavior,' Polymer, Vol. 39 No. 26, pp. 6781-6787
  9. van der Wal A., Gaymans, R. J., 1999, 'Polypropylene - Rubber Blends: 5. Deformation Mechanism During Fracture,' Polymer, Vol .40, pp. 6067-6075
  10. Wildes, G., Keskkula, H., Raul, D. R., 1999, 'Fracture Characterization of PC/ABS Blends: Effect of Reactive Compatibilization, ABS Type and Rubber Concentration,' Polymer, Vol. 40, pp. 7087-7107
  11. Yon-Jig Kim and Jae-Kyoo Lim, 1997, 'A Study on Properties of Corrosion Fracture Surfaces of GFRP in Synthetic Sea Water,' KSME Int'l Journal, Vol. 11, No. 3, pp. 249-254
  12. Gensler, R., Plummer, C.J.G, Grein, C. and Kausch, H.H, 2000, 'Influence of the Loading Rate on the Fracture Resistance of Isotactic Polypropylene and Impact modified Isotactic Polypropylene,' Polymer, Vol. 41, pp. 3809-3819