Damage Characteristics of Cross Ply GFRP and Woven AFRP under Various Impact Velocities

Abstract:

Ankle Foot Orthosis (A.F.O) should endure the uncountable repeating impact and fatigue loadings due to the gait characteristics. This study investigated the impact deflection and relationship between the absorbed energy and the residual strength rate using the cross ply GFRP (glass/epoxy) and the woven AFRP (aramid/epoxy) for the leaf spring in A.F.O. In conclusion, the equation was suggested to evaluate the absorbed energy and the residual strength rate by the different impact velocities. When the cross ply GFRP and the woven AFRP was selected for the leaf spring in A.F.O, it was reasonable to use the cross ply GFRP for the parts subject to the large impact and the woven AFRP for the parts to require the high elastic energy such as the large deformation.

• Periodical: Key Engineering Materials (Volumes 334-335)
• Pages: 409-412
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.334-335.409
• Online since: March 2007
• Authors: Cheol Woong Kim, Sung Hyuk Lee, Sang Heon Lee, Kee Joo Kim
• Keywords: Ankle Foot Orthosis AFO, Aramid/Epoxy, Deflection, Delamination, Elastic Energy, Glass/Epoxy, Impact Energy, Impact Load, Indentation, Rebound Energy, Residual Strength Rate

References

[1] Shamp: Journal of Prosthetics and Orthotics, Vol. 2, No. 1 (2000), p.14~32.

[2] G. E. Husman, J. M. Whitney and J. C. Halpin: ASTM STP 568 (1975), p.92~113.

[3] J. K. Kim and K. W. Kang: Transaction of the KSME, A, Vol. 23, No. 2 (1999), p.294~303.

[4] M. E. Waddoups, J. R. Eisenmann and B. E. Laminski: Journal of Composite Materials, Vol. 5 (1971), p.446~454.