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International Journal of Damage Mechanics
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Saturation of Transverse Cracking with Delamination in Polymer Cross-Ply Composite Laminates

L. R. Dharani

Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla Rolla, MO 65409-0050, USA

J. Wei

Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla Rolla, MO 65409-0050, USA

F. S. Ji

Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla Rolla, MO 65409-0050, USA

J. H. Zhao

Department of Modern Mechanics University of Science and Technology of China Hefei 230027, P.R. China

Delamination along the 0°/90° interface following transverse cracking in the 90° plies of a cross-ply composite laminate is analyzed based on the principle of minimum potential energy. The laminate is subjected to longitudinal applied tensile loading and internal residual thermal stresses. The strain energy release rate criterion has been employed to evaluate the critical applied stresses for transverse cracking and interface delamination. The effect of delamination along the 0°/90° interface on laminate stiffness and thermal property is presented for E-glass/epoxy and graphite/epoxy composite laminates. The longitudinal tensile stress in the 90° plies decreases gradually as the transverse crack density increases and thereby decreasing the tendency for transverse crack multiplication. For a given laminate configuration there exists a saturation (limit) crack density. Continued loading beyond this limit, delamination at the 0°/90° interface would occur. The analytical results are compared with the available experimental data.

Key Words: composite laminates • transverse crack • delamination • energy release rate

International Journal of Damage Mechanics, Vol. 12, No. 2, 89-114 (2003)
DOI: 10.1177/1056789503012002001
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