Free vibration analysis and damage localization in tapered beams with cracks using finite element method

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KAHYA V., ŞİMŞEK S., Gunes S. D.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, cilt.36, sa.2, ss.841-854, 2021 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 36 Sayı: 2
  • Basım Tarihi: 2021
  • Doi Numarası: 10.17341/gazimmfd.711044
  • Dergi Adı: JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Art Source, Compendex, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.841-854
  • Anahtar Kelimeler: Tapered beam, Damage, finite element method, free vibration, modal curvature, NONUNIFORM BEAM, FREQUENCY
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

In this study, a finite element model with two nodes and four degrees of freedom per node (horizontal and vertical translations, rotation and curvature) is presented for free vibration analysis of tapered beams with damages. Element stiffness and mass matrices for Bernoulli-Euler beam with variable cross-section are derived by using the Galerkin method. In the finite element formulation, linear Lagrange polynomials for extensional vibrations and fifth-order Hermitian polynomials for bending vibrations are chosen. Damage is introduced by a stiffness loss coefficient to the element stiffness matrix. The element mass matrix is assumed to be unchanged due to the damage effect. The accuracy of the proposed element is shown by comparison with available literature. Some numerical results are presented to show the success of modal curvature change in finding damage (crack) locations.