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An Efficient Stress Function Approximation for the Free-Edge Stresses in Laminates

Gerry Flanagan
Journal / Anthology

International Journal of Solids and Structures
Year: 1994
Volume: 31
Issue: 7
Page range: 941-952

A solution method is derived for determining the free-edge stresses in composite laminates. The method is based on expanding stress functions in terms of a harmonic series in the thickness direction. Using the principle of minimum complementary energy, a system of ordinary differential equations is derived for the distribution in the width direction. Cross-ply and angle-ply laminates are examined to establish the validity of the solution. Eight- and 16-ply quasi-isotropic laminates are also examined to demonstrate a convergence criterion based on average stress. The method proves to be a relatively simple and efficient approach for this problem.

*Engineering > Mechanical and Structural Engineering