Memetic Computing Applied to the Design of Composite Materials and Structures
Table 4
Local search operators.
Operator
Description
Function
Number 1
It operates on the geometry IU of the laminate, varying the orientation of the laminas, moving each of them 10° closer to 0°. If the orientation of a lamina is 0°, it is left unchanged.
To obtain solutions with improved longitudinal stress tolerance along the -axis better.
Number 2
It operates on the geometry IU of the laminate, varying the orientation of the laminas, moving each of them 10° closer to 90°. If the orientation of a lamina is 90°, it is left unchanged, and if it is −80° it is changed to 90°.
To obtain solutions with improved longitudinal stress tolerance along the -axis better.
Number 3
It operates on the geometry IU of the laminate, varying the orientation of the laminas, moving each of them 10° closer to +45° or −45°, depending on whether it is positive or negative. If the orientation of a lamina is 40°, 50°, −40° or −50°, it is left unchanged, and if it is 0° it is changed to 10°.
To obtain solutions with improved shear stress tolerance.
Number 4
It operates on the geometry IU of the laminate, adding an individual lamina with random orientation and positioning. If the number of laminas is already the maximum possible, it is left unchanged.
To explore into the direction of the greatest number of laminas
Number 5
It operates on the geometry I.U. of the laminate, removing an individual lamina, chosen at random. If there is only one lamina, it is left unchanged.
To explore into the direction of the least number of laminas
Number 6
It operates on the geometry IU of the laminate, changing the orientation of a lamina, chosen at random and relocated in a new position, also chosen at random.
To explore into the direction of new orientations.
Number 7
It operates on the fiber IU, changing it by a distinct one, chosen at random, maintaining the matrix, the volume fraction, the number of laminas and their orientation constant.
To explore into the subspace solution of the fibres alone.
Number 8
It operates on the matrix I.U., changing it by a distinct one, chosen at random, maintaining the fiber, the volume fraction, the number of laminas and their orientation constant.
To explore into the subspace solution of the matrices alone.
Number 9
It operates on the volume fraction IU, changing its value for a distinct one, chosen at random, within the acceptable limits, maintaining the fiber, the matrix, the number of laminas and their orientation constant.
To explore into the subspace solution of the volume fraction alone.
Number 10
It operates on the geometry IU of the laminate, adding an individual lamina with orientation of −10° from the last positioned lamina. If the number of laminas is already the maximum possible, it is left unchanged.
To explore into the greatest number of laminas.
Number 11
It operates on the geometry IU of the laminate, removing an individual lamina, the closest to the last removed lamina, with different angular orientation. If there is only one lamina, it is left unchanged.
