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Numéro
J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 797 - 804
DOI https://doi.org/10.1051/jp4:2006134123
Publié en ligne 26 juillet 2006
EURODYMAT 2006 - 8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 797-804
DOI: 10.1051/jp4:2006134123

Evaluation of interlaminar shear strength of a unidirectional carbon/epoxy laminated composite under impact loading

T. Yokoyama and K. Nakai

Department of Mechanical Engineering, Okayama University of Science, Okayama 700-0005, Japan


Published online: 26 July 2006

Abstract
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 ( $\dot{\gamma} \approx 780/{\rm s}$). 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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