Multi-objective optimization of variable stiffness laminated plates modeled using Bezier curves

Coskun O., Türkmen H. S.

COMPOSITE STRUCTURES, vol.279, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 279
  • Publication Date: 2022
  • Doi Number: 10.1016/j.compstruct.2021.114814
  • Journal Name: COMPOSITE STRUCTURES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Variable stiffness composites, Bezier curve, Multi-objective optimization, Buckling load, Effective stiffness, CURVILINEAR FIBER FORMAT, COMPOSITE PANELS, DESIGN OPTIMIZATION, PARAMETERS, ORIENTATIONS, INPLANE
  • Istanbul Technical University Affiliated: Yes

Abstract

In this paper, intuitive fiber path definition methods using cubic and quadratic Bezier curves are proposed for variable stiffness (VS) laminates designed with Direct Fiber Path Parameterization (DFPP) technique. These methods construct fiber paths with nonlinear angle variation defined by simple design variables that are segment/station angles and multipliers/curvature. At its simplest, balanced symmetric VS laminates defined with two segment/station angles are illustrated, implemented in finite element model under uniaxial compression, and optimized using surrogate based multi-objective non-dominated sorting genetic algorithm (NSGA-II) for maximum buckling load and stiffness. The optimization results of VS laminates using cubic Bezier interpolation and quadratic Bezier approximation curves as fiber paths are compared for three different plate sizes and boundary conditions. The largest simply supported VS laminate that uses cubic Bezier curves of constant curvature as fiber path shows 103% increase in buckling load against 44% reduction in stiffness compared to quasi-isotropic laminate.