Digital Image Mechanical Identification (DIMI)

Abstract : A continuous pathway from digital images acquired during a mechanical test to quantitative identification of a constitutive law is presented herein based on displacement field analysis. From images, displacement fields are directly estimated within a finite element framework. From the latter, the application of the equilibrium gap method provides the means for rigidity field evaluation. In the present case, a reconditioned formulation is proposed for a better stability. Last, postulating a specific form of a damage law, a linear system is formed that gives a direct access to the (non-linear) damage growth law in one step. The two last procedures are presented, validated on an artificial case, and applied to the case of a biaxial tension of a composite sample driven up to failure. A quantitative estimate of the quality of the determination is proposed, and in the last application, it is shown that no more than 7% of the displacement field fluctuations are not accounted for by the determined damage law.
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https://hal.archives-ouvertes.fr/hal-00200974
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Submitted on : Saturday, December 22, 2007 - 11:45:26 AM
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  • HAL Id : hal-00200974, version 1
  • ARXIV : 0712.3918

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Stéphane Roux, François Hild. Digital Image Mechanical Identification (DIMI). Experimental Mechanics, Society for Experimental Mechanics, 2008, 48 (4), pp.495-508. ⟨hal-00200974⟩

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