A new parameter to describe crippling strength: Experimental and theoretical investigations for post-buckling behaviors of the composite structures

Yıldırım E. G., ÜNAL R.

Polymer Composites, cilt.45, sa.2, ss.1585-1599, 2024 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 45 Sayı: 2
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1002/pc.27875
  • Dergi Adı: Polymer Composites
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1585-1599
  • Anahtar Kelimeler: composite, crippling, ply position, post-buckling, progressive failure
  • Gazi Üniversitesi Adresli: Evet

Özet

The post-buckling strength, which is simply called as crippling, is investigated for laminated composite structures in this study. L profiles that had various stacking sequences of carbon fiber reinforced epoxies were tested. Three different layups configurations were used by changing flange-to-thickness ratios. The main objective of this research was to show that flange-to-thickness ratio was not the only effecting parameter for crippling. Therefore, a new parameter, EGY number, was developed by considering the positions of 0° and 45° plies. Depending on EGY number, a new semi-empirical formulation was presented to calculate crippling strength of the laminated composite structures. One of the test results was employed to verification of EGY number. In addition, the test results were validated with finite element analyses. Static, Riks and Dynamic, Explicit computational results were compared to simulate the experiments. Highlights: Determination of crippling strength both experimentally and theoretically. Comparison of numerical models: Static, Riks versus Dynamic, Explicit. Developing a new parameter called as EGY number. Developing of a new analytical semi-empirical formula for crippling strength.