Identification of the plastic behavior of aluminum plates under free air explosions using inverse methods and full-field measurements

Ken Spranghers, Ioannis Vasilakos, David Lecompte, Hugo Sol, John Vantomme

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

This article describes an inverse method for the identification of the plastic behavior of aluminum plates subjected to sudden blast loads. The method uses full-field optical measurements taken during the first milliseconds of a free air explosion and the finite element method for the numerical prediction of the blast response. The identification is based on a damped least-squares solution according to the Levenberg-Marquardt formulation. Three different rate-dependent plasticity models are examined. First, a combined model based on linear strain hardening and the strain rate term of the Cowper-Symonds model, secondly, the Johnson-Cook model and finally, a combined model based on a bi-exponential relation for the strain hardening term and the strain rate term of the Cowper-Symonds model. A validation of the method and its sensitivity to measurement uncertainties is first provided according to virtual measurements generated with the finite element method. Next, the plastic behavior of aluminum is identified using measurements from real free air explosions obtained from a controlled detonation of C4. The results show that inverse methods can be successfully applied for the identification of the plastic behavior of metals subjected to blast waves. In addition, the material parameters identified with inverse methods enable the numerical prediction of the material's response with increased accuracy.
Original languageEnglish
Pages (from-to)210-226
Number of pages17
JournalInternational Journal of Solids and Structures
Volume51
Issue numberDOI 10.1016/j.ijsolstr.2013.09.027
Publication statusPublished - 2014

Keywords

  • Inverse method
  • Free air explosion
  • Finite Element Model
  • Strain Hardening
  • Plastic behavior of aluminum
  • Full-field measurements

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