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Communication Dans Un Congrès Année : 2001

Increasing the maximum strain measured with elastic and viscoelastic bars

Ramzi Ohtman
  • Fonction : Auteur
Pierre Collet
  • Fonction : Auteur
  • PersonId : 842597
Gérard Gary
  • Fonction : Auteur
  • PersonId : 837062

Résumé

A new method has been developed for separating dispersive waves in elastic and viscoelastic rods from multi-point strain and velocity measurements. Knowing then the basic waves, the stress, the strain, the displacement and the particle velocity can be calculated at any point of the bar. The method is based on the assumption of one dimensional and single mode dispersive wave propagation and it takes account of the wave dispersion. It is shown that the method is stable with respect to noise, so that the measuring time is increased considerably. Subsequently, the maximum strain which can be measured in a material tested with a classical SHPB (Split Hopkinson Pressure Bar) set-up is also increased and is no longer limited by the length of the bars. The method is illustrated here by applying it successfully to the analysis of a real test of aluminum honeycomb. It can also be applied to other kinds of one-dimensional and single-mode dispersive waves such as flexural waves in beams and acoustic waves in wave-guides.
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Dates et versions

hal-00116217 , version 1 (24-11-2006)

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Identifiants

  • HAL Id : hal-00116217 , version 1

Citer

Ramzi Ohtman, Marie-Noëlle Bussac, Pierre Collet, Gérard Gary. Increasing the maximum strain measured with elastic and viscoelastic bars. 4th International Symposium on Impact Engineering, 2001, Kumamoto, Japan. pp.49-56. ⟨hal-00116217⟩
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