Abstract
Calculation of the total strain energy release rate, G, during crack-growth of edge delaminations is based on the classical lamination theory and includes residual stresses due to temperature and moisture. The plane of delamination may be located between any two layers of the laminate, and the sublaminates thus formed may exhibit any type of stiffness coupling. The influence of mechanical strain, temperature and moisture on the strain energy release rates of two characteristic laminates is shown in comprehensive plots. the effect of residual stresses on G is relatively mild for the [ (±30) 2, 90, 90] s laminate once proposed by O'Brien for fracture toughness measurements but much more significant in the case of the [ 0 4, 90, 90] s laminate.
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