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Layup optimization of composite material systems
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0002-0307-8917
1993 (English)In: / [ed] Pedersen, P., Amsterdam: Elsevier, 1993, 311-336 p.Conference paper (Refereed)
Abstract [en]

Layup optimization of laminated composite structures is considered. Lamination parameters rather than layup angles and ply thicknesses are used as design parameters, thus any physically possible layup is included and the number of design variables is kept small; twelve for the most general layup. These twelve parameters are functions of the in-plane coordinates if the layup changes from point to point in the structure. It is shown that the feasible region of the parameters is convex, and the object functions to be maximized (stiffnesses, vibration frequencies, or buckling loads) are concave functions; local optima are therefore avoided and the optimization is accordingly significantly simplified. In order to use these parameters for optimization, their feasible region has to be known. The current knowledge is summarized, and some new results concerning the feasible region of the parameters of an orthotropic laminate are presented. When the feasible region of the lamination parameters is known, optimization of general composite material structures can efficiently be performed. A number of simple examples are included, such as flat in-plane homogeneous (same layup and thickness in every point) plates concerning deflections under uniform loads, vibration frequencies, and buckling under uni-axial or shearing loads.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 1993. 311-336 p.
Keyword [en]
layup optimization, composites
National Category
Applied Mechanics
Research subject
Solid Mechanics
URN: urn:nbn:se:kth:diva-196715ISBN: 9780444898692OAI: diva2:1047714
Optimal Design with Advanced Materials, Ed. P. Pedersen, Elsevier Science Publishers, Amsterdam

QCR 20161201

Available from: 2016-11-18 Created: 2016-11-18 Last updated: 2016-12-01Bibliographically approved

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