Prediction of strength characteristics of a composite structure depend
s upon a large number of parameters including ply orientation, ply thi
ckness, stacking sequence and geometry. Analytical solutions alone are
not sufficient for practical design considerations. In this work, an
effective application of a numerical optimization method has been demo
nstrated for the design of a turbine blade, rotating at a constant ang
ular velocity. The analytical blade model used in the optimization is
based on the free-edge stress observations for large width-to-thicknes
s composite configuration. Ply strength ratios were selected as the ob
jective functions and ply orientations were chosen as the design varia
bles. Maximum stress and quadratic failure criteria were satisfied at
multiple cross-sections to obtain the optimum design.