Interlaminar and In-Plane Shear Strengths of a Unidirectional Carbon/Epoxy Laminated Composite under Impact Loading

摘要

The interlaminar (out-of-plane) and in-plane shear strengths of a unidirectional carbon/epoxy (T700/2521) laminated composite with a thickness of 10.05 mm at high rates of deformation are evaluated using the standard split Hopkinson pressure bar. Two kinds of double-notch shear (DNS) specimens with lateral constraint from a supporting jig are used in the static and impact compressive-shear tests. It is shown that both shear strengths increase very slightly with increasing deformation rate at failure up to nearly (δ{top}·){sub}f = 3.2m/s (γ{top}·=640/s), and the interlaminar shear strength is about 30% lower than the in-plane shear strength at low and high rates of deformation. SEM observations are performed to examine the effect of deformation rate on the failure modes in the two kinds of the DNS specimens.