STRESS SINGULARITY OF EDGE DELAMINATION IN ANGLE-PLY AND CROSS-PLY LAMINATES

By utilizing the general solutions derived for the plies with arbitrar y fiber orientations under uniform axial strain (Huang and Chen, 1994) , the explicit solutions of the edge-delamination stress singularities for the angle-ply and cross-ply laminates are obtained. The dominant edge-delamination stress singularities for the angle-ply laminates are found to be a real constant, -1/2, and a pair of complex conjugates, -1/2 +/- i/2 pi In {(b + root b(2) - a(2))/a}. Far the cross-ply lamin ates, the significant effect of transverse shear stresses of the lamin ate is considered and the dominant edge-delamination stress singularit ies are shown as -1/2 and -1/2 +/- i/2 pi ln {(c(2) + root c(2)(2) - 4 c(1)c(3))/2c(1)}. a, b, c(1), c(2), and c(3) are the corresponding com bined complex constants. In addition, two elementary forms of edge-del amination stress singularity, say, r(-1/2) and r(delta r) (ln r)(n)(de lta(r) = n - 3/2, n = 1, 2...) exist for both the angle-ply and cross- ply laminates. Excellent correlations between tile present results and available solutions show the validity of the approach. The deficienci es of the solutions available in the literature ape compensated. New r esults for other angle-ply and cross-ply laminates are also provided.