A stress scale in full-field identification procedures: a diffuse stress gauge

Roux, Stéphane; Hild, François; Pagano, Stéphane

doi:10.1016/j.euromechsol.2005.02.002

Cited by 15 publications

(14 citation statements)

References 16 publications

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“…Another one, referred to as an integrated analysis , considers the library of displacement fields X n and Ç n and performing, for instance, digital image correlation to identify directly the unknown components x n and t n . It corresponds to yet another way of using the concept of ''diffuse stress gauging" (Roux et al, 2005;. By using an integrated approach, the support of the gauge is diffuse on the sample face.…”

Section: Resultsmentioning

confidence: 99%

Enriched kinematic fields of cracked structures

Henninger¹,

Roux²,

Hild³

2010

International Journal of Solids and Structures

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a b s t r a c tFar from the crack tip process zone where non-linear phenomena take place, the mechanical behavior of a cracked medium can be analyzed within the framework of elasticity. Apart from the classical singular stress field associated with the elastic behavior, the effect of a confined process zone is decomposed over a set of (super-singular) fields. Because these fields are indexed by the exponent of their decay with distance from the crack tip, the dominant effect of non-linear mechanisms is characterized by the amplitudes of the first super-singular fields (modes I and II). This approach provides a macroscopic characterization of crack tip non-linearities and describes accurately the displacement field. As an application, the cyclic loading of a cracked elasto-plastic medium is discussed.

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Section: Resultsmentioning

confidence: 99%

Enriched kinematic fields of cracked structures

Henninger¹,

Roux²,

Hild³

2010

International Journal of Solids and Structures

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“…The constraints corresponding to observations at the boundary [equation (7) or equation (10)]are superimposed to this system using Lagrange multipliers.…”

Section: First Minimization: Stress Field Computationmentioning

confidence: 99%

“…The identification of material properties from field measurements is a particularly active research area that has led to the development of various approaches, with some of the most widespread being: the finite element model updating method [5], the virtual field method [6], or the equilibrium gap method [7].…”

Section: Introductionmentioning

confidence: 99%

Elastoplastic Behavior Identification for Heterogeneous Loadings and Materials

et al. 2007

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Image processing techniques provide access to full field measurements of different thermomechanical data (strain; strain-rate, Wattrisse et al., J Exp Mech, 41:29-38, 2001; temperature, Chrysochoos and Louche, Int J Eng Sci 38:1759-1788, 2000. These techniques have become increasingly useful for obtaining fine and local descriptions of material properties. As they can measure complete thermal and mechanical fields, they can be used to identify several parameters of constitutive equations during a single deformation process using specifically designed heterogeneous tests (Grédiac, Composites: Part A 35:751-761, 2004). In Geymonat and Pagano (Meccanica 38:535-545, 2003), surface strain fields obtained by digital image correlation were used to identify the distribution of elastic parameters and stress fields by minimizing a given energy functional. In this paper, the previous method is improved through a relevant choice for stress approximation, and then extended to a wider class of elastoplastic materials. Its reliability is then checked through applications on simulated data obtained under small perturbation and plane stress assumptions. In particular, the robustness of the method with respect to measurement noise is studied on the basis of numerical data. An experimental application to heterogeneous material identification is finally proposed.

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“…as already developed to analyze a Flamant problem [20]. Consequently, a first analysis consists in considering a ROI close to the zone where the load is applied (ROI 1, see Figure 1a).…”

Section: Elastic Analysis: Load Gaugementioning

confidence: 99%

Calibration of constitutive models of steel beams subject to local buckling by using digital image correlation

Hild¹,

Roux²,

Guerrero³

et al. 2011

European Journal of Mechanics - A/Solids

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It is proposed to identify the behavior of steel beams prior to and after the inception of local buckling by using Digital Image Correlation. Full field measurements are used to evaluate kinematic and static fields for determining constitutive laws. It enables for the detection of local buckling inception and the evaluation of the postbuckled behavior. Constitutive models are tuned by using measured Euler-Bernoulli kinematics.

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A stress scale in full-field identification procedures: a diffuse stress gauge

Cited by 15 publications

References 16 publications

Enriched kinematic fields of cracked structures

Enriched kinematic fields of cracked structures

Elastoplastic Behavior Identification for Heterogeneous Loadings and Materials

Calibration of constitutive models of steel beams subject to local buckling by using digital image correlation

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