Graphite-epoxy beams were subjected to an eccentric axial impact load in a drop tower test fixture in order to study their large displacement flexural behavior. The time history of the transient axial load exhibited a large magnitude occurring just after impact, which was many times greater than the static failure load. The damage caused by this peak dynamic load was measured by the reduction in energy absorption of the impacted beam relative to a virgin beam in static tests. For the thirty-ply specimens, the amount of damage increased with increasing axial stiffness.
Get full access to this article
View all access options for this article.
References
1.
Fasanella, E.L. , R.J. Hayduk, M.P. Robinson and E. Widmayer "Analysis of a Transport Fuselage Section Drop Test. Research in Structures and Dynamics—1984," Robert J Hayduk and Ahmed K. Noor, Compliers, NASA CP-2335, pp. 347-368 (June, 1984).
2.
Derian, E.J. and M.W. Hyer "Large Deformation Dynamic Bending of Composite Beams," NASA Contractor Report 4006 (August, 1986)
3.
Sensmeier, M.D. , O.H. Griffin and E.R. Johnson. "Static and Dynamic Large Deflection Flexural Response of Graphite-Epoxy Beams," Center for Composite Materials and Structures Report CCMS-87-07 and College of Engineering Report VPI-E-87-7 , Virginia Polytechnic Institute and State University , Blacksburg, Virginia (May, 1987 )
