Structural efficiency via minimisation of elastic energy in damage tolerant laminates

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2 Citations (Scopus)

Abstract

Genetic Algorithm and exhaustive search techniques identify balanced symmetric stacking sequences that minimise elastic energy to produce optimal structural efficiency under combined loading. Constraints are added to account for use of standard ply angles, laminate design rules and damage tolerance. The damage tolerant strength constraint produces a bilevel optimization problem: surface plies are orientated to sufficiently minimise energy available for sublaminate buckling driven delamination propagation; core plies are orientated to maximise stiffness in response to a uniaxial load case. The proposed methodology demonstrates that current, standard ply angle, aerospace designs can be near optimal for undamaged strength. However, continuous angles and relaxation of design rules offer significant scope for improved damage tolerance.

Original languageEnglish
Title of host publication16th European Conference on Composite Materials, ECCM 2014
PublisherEuropean Society for Composite Materials
ISBN (Print)9780000000002
Publication statusPublished - 2014
Event16th European Conference on Composite Materials, ECCM 2014 - Seville, UK United Kingdom
Duration: 22 Jun 201426 Jun 2014

Conference

Conference16th European Conference on Composite Materials, ECCM 2014
CountryUK United Kingdom
CitySeville
Period22/06/1426/06/14

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Keywords

  • Damage tolerance
  • Elastic energy
  • Minimum mass
  • Optimization

Cite this

Nielsen, M., Rhead, A. T., & Butler, R. (2014). Structural efficiency via minimisation of elastic energy in damage tolerant laminates. In 16th European Conference on Composite Materials, ECCM 2014 European Society for Composite Materials.