Finite element model calibration of a nonlinear perforated plate

David A Ehrhardt*, Matthew S. Allen, Timothy J. Beberniss, Simon A. Neild

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)
245 Downloads (Pure)

Abstract

This paper presents a case study in which the finite element model for a curved circular plate is calibrated to reproduce both the linear and nonlinear dynamic response measured from two nominally identical samples. The linear dynamic response is described with the linear natural frequencies and mode shapes identified with a roving hammer test. Due to the uncertainty in the stiffness characteristics from the manufactured perforations, the linear natural frequencies are used to update the effective modulus of elasticity of the full order finite element model (FEM). The nonlinear dynamic response is described with nonlinear normal modes (NNMs) measured using force appropriation and high speed 3D digital image correlation (3D-DIC). The measured NNMs are used to update the boundary conditions of the full order FEM through comparison with NNMs calculated from a nonlinear reduced order model (NLROM). This comparison revealed that the nonlinear behavior could not be captured without accounting for the small curvature of the plate from manufacturing as confirmed in literature. So, 3D-DIC was also used to identify the initial static curvature of each plate and the resulting curvature was included in the full order FEM. The updated models are then used to understand how the stress distribution changes at large response amplitudes providing a possible explanation of failures observed during testing.

Original languageEnglish
Pages (from-to)280-294
Number of pages15
JournalJournal of Sound and Vibration
Volume392
Early online date29 Dec 2016
DOIs
Publication statusPublished - 31 Mar 2017

Keywords

  • Geometric nonlinearity
  • Model calibration
  • Nonlinear normal modes

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