The Influence of Cooling Conditions on the Mechanical Properties of Commingled Yarn Composites

Abstract

The influence of cooling conditions on the bending properties and Mode I interlaminar fracture toughness of commingled PET/GF and PA6/GF composites was investigated. The morphology and thermal properties of the composites were studied using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC).

The results show that cooling conditions had no major effect on bending properties, but the fracture toughness (GC) was affected; i.e., fracture toughness of gradual cooling was lower than rapid cooling. The bending properties are not significantly affected by crystallinity, but GC is strongly influenced by the level of crystallinity in the matrix resin.

References

1. Chang, I. Y. and J. K. Lees . 1988. "Recent Developments in Thermoplastic Composites: A Review of Matrix Systems and Processing Methods," J. Thermoplas. Comp. Mater., 1:277-295.

2. Matsuo, T. 1993. "Prospect of Thermoplastic Composites," J. Jap. Soc. Polym. Proc., 5:225-229.

3. Matsuo, T. 1992. 'Analysis of Thermoplastic Composites," Adv. Comp. Lett., 1:171-173.

4. Majidi, A. P. , M. J. Rotermund and L. E. Taske . 1988. "Thermoplastic Preform Fabrication and Processing," SAMPE J., 24:12-17.

5. Kiyohara, N. 1991. 'Application of Thermoplastic Filaments to Advanced Composite Materials," Jap. J. Reinf Plast., 38:131-137.

6. Lynch, T. 1989. "Thermoplastic/Graphite Fiber Hybrid Fabrics," SAMPE J., 25:17-22.

7. Ye, L. , V. Klinkmuller and K. Friedrich . 1992. "Impregnation and Consolidation in Composites made of GF/PP Powder Impregnated Bundles," J. Thermopl. Comp. Mater., 5:32-48.

8. Fujii, M. 1991. "Thermoplastic Composites," Jap. J. Reinf Plast., 38:131-137.

9. Harper, R. C. 1992. "Thermoforming of Thermoplastic Matrix Composites Pt. I., SAMPE J., 28:9-15.

10.

10. Lee, W. I. , M. F Talbott and G. S. Springer . 1987. "Effect of Cooling Rate on the Crystallinity and Mechanical Properties of Thermoplastic Composites," J. Reinf. Plast. Comp., 6:2-12.

11.

11. Ye, L. and K. Friedrich . 1993. "Mode I Interlaminar Fracture of Comingled Yarn Based Glass/Polypropylene Composites," Compos. Sci. Technol., 46:187-198.

12.

12. Leach, D. C. 1989. "Continuous Fibre Reinforced Composites," Advanced Composites, I. K. Partridge , ed., Essex: Elsevier Pub, pp. 43-109.

13.

13. Davies, P. , W. Cantwell , H. Richard , C. Moulin and H. H. Kausch . 1989. "Interlaminar Fracture Testing of Carbon Fiber/PEEK Composites," Proc. 3rd Int. Conf on Composite Materials, A. R. Bunsell , P. Lamicq and A. Massiah , eds., London: Elsevier Applied Science, pp. 747-755.

14.

14. Curtis, P. T.

'An Investigation of the Tensile Fatigue Behaviour of Improved Carbon Fiber Composite Materials,"

Proc. ICCMVI-ECCM2, F. L. Matthews , N. C. R. Buskell , J. M. Hodgkinson and J. Morton , eds., London: Elsevier Applied Science, pp. 4.54-4.64.

15.

15. Cantwell, W. J. , P. Davies and H. H. Kausch . 1990. "The Effect of Cooling Rate on Deformation and Fracture in IM6/PEEK Composites," Compos. Struct. 14:151-171.

16.

16. Kageyama, K. 1992. "Fracture Mechanics of Composites," J. Jap. Soc. Compos. Mater., 18:158-165.

17.

17. 1991. Japan Soc. Polym. Sci. Baihukan, Pub. p. 561-561.

18.

18. Shonaike, G. O. 1986. PhD thesis, University of London.

19.

19. Davies, P. and D. R. Moore . 1990. "Glass/Nylon-66 Composites: Delamination Resistance Testing," Compos. Sci. Technol., 38:211-227.

20.

20. Lee, W. I. , M. F Talbott , G. S. Springer and L. A. Berglund . 1987. "Effects of Cooling Rate on the Crystallinity and Mechanical Properties of Thermoplastic Composites," J. Reinf Plast. Compos., 6:2-12.

21.

21. Wittich, H. and K. Friedrich . 1988. "Interlaminar Fracture Energy of Laminates Made of Thermoplastic Impregnated Fiber Bundles," J. Thermopla. Compos. Mater., 1:221-231.

22.

22. Goffaux, B. , I. Verpoest and R. Legras . 1993, "The Toughness Transfer from Matrix to Unidirectional Thermoplastic Composites," Proc. 38th Inter. SAMPE Symposium, pp. 38-45.