Abstract
In this paper, the classical solution of the opening mode crack in the 90° layer of 0/90/0 laminates has been determined by means of Fourier transformations and the procedure of Copson for a pair of dual integral equations. The fracture behavior and the in situ transverse strength of the 90° layer have been quantitatively studied in graphite/epoxy laminates, based on the solution obtained above.
The results show that the stress intensity factor of this kind of laminates, which is different from that of a single unidirectional 90° layer, decreases with the increase in thicknessb, or modulusE L orG LT of the 0° layer and also decreases with the decrease in the thickness of the 90° layer. So the lamination effect manifests itself and thein situ transverse strength of the 90° layer is thereby enchanced. The theoretical calculations agree with the experimental data presented by D.L. Flaggs.
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Supported by National Natural Science Fundation of China.
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Fuqun, F., Wanlin, D. & Jianxiang, W. A study of the in situ transverse tensile lamina strength and the classical solution of the opening mode crack in a 0/90/0 laminate. Acta Mech Sinica 4, 327–336 (1988). https://doi.org/10.1007/BF02486666
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DOI: https://doi.org/10.1007/BF02486666