Manufacturing issues
Blending rule  Plies may be droped in the > direction starting from the key element 
Design space
Two optimization problem formulations were introduced
to incorporate blending rules.
t  Formulation t_{i(j,k)} binary thickness
variable indicating presence of a ply i in an element (j,k)
minimize f(q,t)
subject to g_{l}(q,t)
>
0 l = 1,...,m
dFormulation d_{i(j)}  distance variable indicating
number of elements a ply i occupies ina row j
minimize f(q,d)
subject to g_{l}(q,t)
>
0 l = 1,...,m
N = maximum number of plies in each element

Examples
Sample 4x3 panel
Layup for a blended panel using d variables 
Home  Composite
Design
 Global Optimization
Penalty Formulation  Hierarchical
Formulation  IHR  SA 
Domain
Stiffened Panels  Load
Redistribution  Manufacturing Issues  Design
Space  Examples
Direction Generators  Step
Size Generators
Publications  People
 Software