J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 797-804
Evaluation of interlaminar shear strength of a unidirectional carbon/epoxy laminated composite under impact loadingT. Yokoyama and K. Nakai
Department of Mechanical Engineering, Okayama University of Science, Okayama 700-0005, Japan
Published online: 26 July 2006
The interlaminar shear strength (ILSS) of a unidirectional carbon/epoxy (T700/2521) laminated composite under impact loading is determined using the conventional split Hopkinson pressure bar. Double-notch shear (DNS) specimens with lateral constraint from a supporting jig are used in the static and impact interlaminar compressive shear tests. Short-beam shear specimens are also used under static 3-point bending. Numerical stress analyses are performed to determine the shear stress and normal stress distributions on the expected failure plane in the DNS specimen using the MSC/NASTRAN package. The effect of deformation rate on the ILSS and failure mode is investigated. It is observed that the ILSS is independent of the deformation rate up to nearly 1.5m/s ( ). The validity of the test results is confirmed by microscopic examinations of both static and impact failure surfaces for the DNS specimens.
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