Effect of in-plane boundary restraints on optimal design of skew laminates under buckling loads

ÇAĞDAŞ İ. U., ADALI S.

COMPOSITE STRUCTURES, cilt.93, sa.8, ss.2060-2069, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 93 Sayı: 8
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.compstruct.2011.02.015
  • Dergi Adı: COMPOSITE STRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2060-2069
  • Anahtar Kelimeler: Pre-buckling stresses, Skew laminates, Stress diffusion, Buckling, Optimal design, PLATES, SHEAR, COMPRESSION, STABILITY, BEHAVIOR
  • Akdeniz Üniversitesi Adresli: Evet

Özet

Symmetrically laminated cross-ply and angle-ply skew plates subject to uniaxial buckling loads and various combinations of in-plane boundary restraints are studied using a shear deformable theory. For this purpose a finite element code is developed and applied to a couple of verification problems. The formulation of the parabolic iso-parametric plate element is briefly given and numerical results obtained for the verification problems related to stability analysis and stress diffusion are presented. The effect of in-plane restraints on the non-uniform distribution of in-plane stresses is studied by means of contour graphs. Next the buckling loads are maximized with respect to layer thicknesses in the case of cross-ply laminates and with respect to fiber orientations in the case of angle-ply laminates. The optimization results show that the exclusion of the in-plane restraints, which arise in several engineering applications, may lead to errors in the stability analysis and consequently in the design of laminated plates against buckling. (C) 2011 Elsevier Ltd. All rights reserved.