Optimising the ply dropping order in variabel stiffness, variable thickness laminates using stacking sequence tables

Daniel Peeters, F.X. Irisarri, Mostafa Abdalla

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Modern composite structures o
er two avenues of optimising performance. One, optimising a single stacking sequence over the structure leading to constant sti
ness designs. Two, varying the sti
ness over the structure. This may be achieved by dropping plies, changing the thickness, or by steering the fibres, changing the fibre angles. Optimising ply drops involves two decisions: the selection of ply drop boundaries, and of the ply drop order. Previous work considered the problems of optimising the fibre angle distribution and ply drop boundaries but ply drop order was pre-specified. This paper extends the work to simultaneously optimise the fibre angle distribution, the ply drop boundaries, and order. The optimisation of fibre angle distribution lends itself to gradient-based methods. The ply drop boundary optimisation is formulated using topology optimisation techniques and is thus also solvable using gradient-based methods. The ply drop order optimisation requires discrete variables and is hence approached using an evolutionary algorithm based on stacking sequence tables. In this paper an e
cient multi-step algorithm is developed combining the optimisation of all aspects of variable sti
ness laminates. The results indicate that significant improvements may be obtained by including the ply drop order in the optimisation at a relatively modest computational cost.
Original languageEnglish
Title of host publication17th European Conference on Composite Materials
Subtitle of host publicationMunich, Germany
PublisherKIT
Number of pages8
ISBN (Print)978-3-00-053387-7
Publication statusPublished - 2016
Event17th European Conference on Composite Materials, ECCM 2016 - Munich, Germany
Duration: 26 Jun 201630 Jun 2016
Conference number: 17
http://www.eccm17.org/

Conference

Conference17th European Conference on Composite Materials, ECCM 2016
Abbreviated titleECCM 2016
CountryGermany
CityMunich
Period26/06/1630/06/16
Internet address

Keywords

  • optimisation
  • Variable thickness
  • Variable stiffness
  • Stacking sequence table

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