Role of Failure Modes on Energy Absorption in Unidirectional PMC Tubes

Abstract

The primary focus of this investigation was to study the effect of failure modes on key energy absorption parameters including the initial peak load (Ppeak), the drop in the peak load and the sustained crushing load (Pavg.) in the crushing process of unidirectional polymer matrix composite (PMC) tubes under quasi-static conditions. The failure modes of interest are the axial cracks, the transverse cracks and delamination. The roles of initiators with different radii and external constraints were carefully analyzed in the context of primary failure modes using a real time image acquisition system. The results for fiberglass/polyester tubes showed that the failure modes play a critical role on the load-deflection (P-) response of the tubes and their corresponding specific energy absorption (SEA). In addition, it was possible to control the failure modes for better crushing performance by using external constraints combined with initiators.

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References

1. Thornton, P. H. 1979. “Energy Absorption in Composite Structures.” Journal of Composite Materials, 13:247-262.

2. Thornton, P. H. , 1990. “The Crush Behavior of Pultruded Tubes at High Strain Rates.” Journal of Composite Materials, 24:549-615.

3. Farley, G. L. and Jones, R. M. , 1989. “Energy Absorption Capability of Composite Tubes and Beams,” NASA Technical Memorandum 101634, AVSCOM Technical Report 89-B-003.

4. Farley, G. L. and Jones, R. M. , 1992a. “Crushing Characteristics of Continuous Fiber-Reinforced Composite Tubes.” Journal of Composite Materials, 26:37-50.

5. Farley, G. L. and Jones, R. M. , 1992b. “Prediction of Energy-Absorption Capability of Composite Materials.” Journal of Composite Materials, 26:388-403.

6. Farley, G. L. and Jones, R. M. , 1992c. “Analogy for the Effect of Material and Geometrical Variables on Energy Absorption Capability of Composite Materials,” Journal of Composite Materials, 26:78-89.

7. Ramakrishna, S. and Hull, D. , 1993. “Energy Absorption Capability of Epoxy Composite Tubes with Knitted Fibre Fabric Reinforcement.” Composite Science and Technology, 49:349-356.

8. Mamalis, A. G. , Manolakos, D. E. , Viegelahn, J. L. , Demosthenous, G. A. , and Sin-Min-Yap , 1991. “Microscopic Failure of Thin-Walled Fibre-Reinforced Composite Frusta Under Static and Dynamic Axial Collapse.” International Journal of Vehicle Design, 12:557-578.

9. Mamalis, A. G. , Manolakos, D. E. , Demstheneous, G. A. and Ioannidis, M. B. , 1994. “Axial Collapse of Thin-Walled Fiberglass Composite Tubular Components at Elevated Strain Rates.” Composite Engineering, 4(6): 653-677.

10.

10. Mamalis, A. G. , Manolakos, D. E. , Demstheneous, G. A. and Ioannidis, M. B. , 1996a. “Analysis of Failure Mechanisms Observed in Axial Collapse of Thin-Walled Circular Fiberglass Composite Tubes.” Thin-Walled Structures, 24:335-352.

11.

11. Hamada, H. , Ramakrishna, S. , Nakamura, M. , Meakawa, Z. and Hull, D. , 1994. “Progressive Crushing Behavior of Glass/Epoxy Composite Tubes with Different Surface Treatment.” Composite Interfaces, 2(2):127-142.

12.

12. Hull, D. , 1991. “A Unified Approach to Progressive Crushing of Fibre-Reinforced Composite Tubes.” Composite Science and Technology, 40:377-421.

13.

13. Abdel-Haq, M. , Broggiato, G. B. , and Newaz, G. M. , 1999. “Constraint Effects on Energy Absorption of Unidirectional PMC Tubes.” Journal of Composite Materials, 33:774-793.

14.

14. Abdel-Haq, M. and Newaz, G. M. , 1998. “An Innovative Approach to Improve Energy Absorption in Polymeric Composite Tubes.” Presented in ASME Symposium on Life Prediction of Materials and Structures, IMECE’98, Nov., Anaheim, CA.