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Tensile fracture of centre-notched angle ply (0/±45/0)S and (0/90)2S graphite — epoxy composites

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Abstract

The fracture behaviour of centre-notched (0/± 45/0)S and (0/90)2S laminates with increasing notch length has been studied. Two test series have been investigated: specimens of constant width (W=20 mm) and small notch length (2a ⩽ 12 mm), and specimens with various notch lengths (5 ⩽ 2a ⩽ 35 mm) and a constant relative notch length (2a/W=0.5). An X-ray technique showed that the damage at the notch tip, which is formed at increasing load, consists mainly of subcracks parallel to the fibres of the constituent layers. The damage zone causes the crack opening displacement (COD) to deviate from the original linearity. TheK R curve concept has been applied assuming that the COD deviation from linearity is completely the result of original crack extension. This approach fails to describe the notch length effect, because a tangent point between theK R andK curves was not found and because of a strong dependency of the maximum fracture resistanceK Rmax on notch length. The fracture behaviour of 20 mm wide specimens could be explained with the point and average stress criteria, based on characteristic lengths which are independent of notch length. At various notch lengths at a constant 2a/W=0.5, however, the characteristic lengths increased with increasing notch length.

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Author notes

  1. S. Ochiai

    Present address: Department of Metallurgy, Faculty of Engineering, Kyoto University, Sakyo-ku, 606, Kyoto, Japan

Authors and Affiliations

  1. Institut für Werkstoff-Forschung, DFVLR, Postfach 90 60 58, D-5000, Köln 90, West Germany

    S. Ochiai & P. W. M. Peters

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  1. S. Ochiai
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Ochiai, S., Peters, P.W.M. Tensile fracture of centre-notched angle ply (0/±45/0)S and (0/90)2S graphite — epoxy composites. J Mater Sci 17, 417–428 (1982). https://doi.org/10.1007/BF00591477

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  • DOI: https://doi.org/10.1007/BF00591477

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