A level-set-based strategy for thickness optimization of blended composite structures

F. Farzan Nasab (Corresponding Author), H. J.M. Geijselaers, I. Baran, R. Akkerman, A. de Boer

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

An approach is presented for the thickness optimization of stiffened composite skins, which guarantees the continuity (blending) of plies over all individual panels. To fulfill design guidelines with respect to symmetry, covering ply, disorientation, percentage rule, balance, and contiguity of the layup, first a stacking sequence table is generated. Next, a level-set gradient-based method is introduced for the global optimization of the location of ply drops. The method aims at turning the discrete optimization associated with the integer number of plies into a continuous problem. It gives the optimum thickness distribution over the structure in relation to a specific stacking sequence table. The developed method is verified by application to the well-known 18-panel Horseshoe Problem. Subsequently, the proposed method is applied to the optimization of a composite stiffened skin of a wing torsion box. The problem objective is mass minimization and the constraint is local buckling.

Original languageEnglish
Pages (from-to)903-920
Number of pages18
JournalComposite structures
Volume206
DOIs
Publication statusPublished - 15 Dec 2018

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Composite structures
Skin
Composite materials
Global optimization
Torsional stress
Buckling

Keywords

  • Blending
  • Buckling optimization
  • Composite panel
  • Level-set method
  • Stacking sequence table (SST)

Cite this

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title = "A level-set-based strategy for thickness optimization of blended composite structures",
abstract = "An approach is presented for the thickness optimization of stiffened composite skins, which guarantees the continuity (blending) of plies over all individual panels. To fulfill design guidelines with respect to symmetry, covering ply, disorientation, percentage rule, balance, and contiguity of the layup, first a stacking sequence table is generated. Next, a level-set gradient-based method is introduced for the global optimization of the location of ply drops. The method aims at turning the discrete optimization associated with the integer number of plies into a continuous problem. It gives the optimum thickness distribution over the structure in relation to a specific stacking sequence table. The developed method is verified by application to the well-known 18-panel Horseshoe Problem. Subsequently, the proposed method is applied to the optimization of a composite stiffened skin of a wing torsion box. The problem objective is mass minimization and the constraint is local buckling.",
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A level-set-based strategy for thickness optimization of blended composite structures. / Farzan Nasab, F. (Corresponding Author); Geijselaers, H. J.M.; Baran, I.; Akkerman, R.; de Boer, A.

In: Composite structures, Vol. 206, 15.12.2018, p. 903-920.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - A level-set-based strategy for thickness optimization of blended composite structures

AU - Farzan Nasab, F.

AU - Geijselaers, H. J.M.

AU - Baran, I.

AU - Akkerman, R.

AU - de Boer, A.

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AB - An approach is presented for the thickness optimization of stiffened composite skins, which guarantees the continuity (blending) of plies over all individual panels. To fulfill design guidelines with respect to symmetry, covering ply, disorientation, percentage rule, balance, and contiguity of the layup, first a stacking sequence table is generated. Next, a level-set gradient-based method is introduced for the global optimization of the location of ply drops. The method aims at turning the discrete optimization associated with the integer number of plies into a continuous problem. It gives the optimum thickness distribution over the structure in relation to a specific stacking sequence table. The developed method is verified by application to the well-known 18-panel Horseshoe Problem. Subsequently, the proposed method is applied to the optimization of a composite stiffened skin of a wing torsion box. The problem objective is mass minimization and the constraint is local buckling.

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KW - Buckling optimization

KW - Composite panel

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