AN EXPERIMENTAL STUDY ON THE BEHAVIOUR OF GLASS FILLED POLYPROPYLENE AND POLYETHYLENE COMPOSITE PIPES UNDER QUASI-STATIC AXIAL LOADING
DOI:
https://doi.org/10.11113/jt.v74.4841Keywords:
Glass filled polypropylene and polyethylene composite pipe, energy absorption, volume of fraction, fiber orientation, collapse modeAbstract
The behaviour of extruded glass fibre reinforced thermoplastic pipes under axial crushing load was investigated experimentally. It was envisaged that the difference between the axial and hoop moduli and strengths as well as the volume fraction would influence the mode of collapses and energy absorption. The ability to vary the moduli and the fibre volume fraction provides means of controlling the collapse mode in order to optimize specific energy absorption. Axial compression tests were performed on glass filled Polypropylene (GPP) and glass filled Polyethylene (GPE) composite pipes. The samples were chosen with a variety of fibre volume fraction (Vf = 5% to 20% and average angle of orientation 15θ">  = 50o to 80o) to evaluate the effect of anisotropy and Vf to the collapse modes when subjected to axial static loading. The results from the experiments revealed that typical axial and hoop modulus (Ea and 15Eθ"> ) of GPP and GPE pipes increased with increasing of 15θ">  from 55 15°">  to 75 15°">  and decreased gradually in between 75 15°">  to 80 15°"> . The axial modulus was increased constantly with the increase of Vf from 5 % to 20 %. However, the hoop modulus is the highest at 5% Vf, decreases significantly at 10%, and gradually increases at 20%. It is noticed that, the GPP and GPE pipes contain higher Vf and 15θ"> , collapsed in brittle failure mode (fragmentation), whereas those with less Vf and 15θ">  angle, collapsed in non-axis-symmetric (diamond) mode with the local fracture while the local fracture disappeared with lower fibre contents.
References
Hull, D. 1983. Axial Crushing of Fiber Reinforced Composite Tube. In Structural Crashworthiness, N. Jones and T. Wierzbicki, Butterworth, London. 35-118.
Haug, E. and Rouvray, A. D., Crush. Response of Composite Structures. Engineering System International. SA, 94578 Rungis-Cedex, France.
Thornton, P. H. 1979. Energy Absorption in Composite Structures. J. Composite Mat. 13: 247-262.
Farley, G. L. 1986. The Effect of Fibres and Maximum Strain on the Energy Absorption of Composite Materials. J. Composites Mat. 20: 322-334.
Schmueser, D. W. and Wickcliffe, L. E. 1987. Impact Energy Absorption of Continuous Fibre Composite Tubes. J Eng. Mat. Tech. 109: 72-77.
Price, J. N. & Hull, D. 1988. Crushing Behaviour of Square Section of Glass Fibre Polyester Tube. In How to Apply Advance Composite Tech. ASM International. 53-61.
Price, J. N. & Hull, D. 1987. Axial Crushing of Glass Fibre-Polyester Composite Cones. Composite Sc. Tech. 28: 30-211.
Thornton, P. H. and Jeryan, R. A. 1988. Crash Energy Management in Composite Automotive Structures. Int. J. Impact Eng. Mat. 7: 167-180.
Mamalies, A. G., Manolakos, D. E. and Viegelahn, G. L. 1989. The Axial Crushing of Thin PVC Tubes and Frusta of Square Cross Section. Int. J. Impact. Eng. 8: 64-241.
Carruthers, J. J., Kettle, A. P. and Robinson, A. M. 1998. Energy Absorption Capability and Crashworthiness of Composites. Appl. Mech. Rev. 51: 10.
Mamalies, A. G. Review Crashworthy Capacity of Composite Materials. Composite Structure. 37: 109-134.
Hull, D. 1991. A Unified Approach to Progressive Crushing of Fibre-reinforced Composite Tubes. Composite Science and Technology. 40: 377-421.
Farley, G. L. 1983. Energy Absorption of Composite Materials. J. Comp. Mat. 17, 267-279.
Thorton, P. H. and Edwards, P. J. 1982. Energy Absorption in Composite Tubes. J. Comp. Mat. 16: 521-45.
Farley, G. L. and Jones. 1992. Crushing Characteristic of Continuous Fibre-Reinforced Composite Tubes. J. Comp. Mat. 26: 37-50.
Farley, G. L. 1986. The Effect of Fibre and Matrix Maximum Strain on Energy Absorption of Composite Materials. J. Comp. Mat. 20: 322-334.
Mamalies, A. G. 1991. On the Axial Crushing of Fibre-Reinforced Composite Thin-Walled Cornical Shell. Int. J. Vehicle Des. 12: 450-467
Private communication with El-Sobky, H.
Farley, G. L 1986. Effect of Specimens Geometry on Energy Absorption Capability of Composite Materials. J. Comp. Mat. 20: 390-400.
Farley GL and Jones RM (1992)Crush characteristic of composite tubes with near elliptical cross-section. J. Comp. Mat. 13, 37-50
Isaac, M. D. and Ori Ishai. 1994. Engineering Mechanics of Composite Materials. New York, Oxford.
Doshi, S. R., Dealy, J. M. and Charrier, J. M. 1986. Flow Induced Fibre Orientation in an Expanding Channel Tubing Die. Polymer Engineering and Science. 26: 486-478.
Bilgin and Sobky. 1981. Extrusion of Pipes Using Rotating Die System. Msc. Thesis, Umist, Manchester, England.
Hull, D. 1981, 1996. An Introduction to Composites Materials. 2nd. Edition. Cambridge.
Jian Liu and Sobky. 1996. A Study of Fibres Orientation in Composite Melt Processing. Mphil Thesis, UMIST, Manchester England.
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