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

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    2 Citations (Scopus)
    13 Downloads (Pure)

    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

    Fingerprint

    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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    year = "2018",
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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.

    PY - 2018/12/15

    Y1 - 2018/12/15

    N2 - 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.

    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.

    KW - Blending

    KW - Buckling optimization

    KW - Composite panel

    KW - Level-set method

    KW - Stacking sequence table (SST)

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