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Communication Dans Un Congrès Année : 2021

From discrete to continuum modelling of crack induced anisotropy in concrete

Résumé

The behavior of a quasi-brittle material such as concrete is closely linked to the development of cracking. Therefore, Discrete Elements Models-which are designed to describe discontinuous media-are able to reproduce the failure of concrete. Even though their use for structural computations is still limited because of the mesh density required for such modeling, they can be used as a virtual testing tool to establish and identify the constitutive equations of a macroscopic model. In this contribution, the formulation and identification of an anisotropic damage model is presented. It is proposed to use a beam-particle model [1, 2] to perform numerical characterization tests. Indeed, those discrete elements models explicitly describe cracking by allowing displacement discontinuities and thus capture crack induced anisotropy. Those simulations allow to complete the standard experimental tests and thus improve the identification of the continuum damage model. Through 2D discrete simulations, the evolution of the effective elasticity tensor for various loading test up to failure is obtained. The analysis of these tensors through bi-dimensional harmonic decomposition [3, 4] is then performed to estimate the tensorial damage evolution and thus formulate an equivalent anisotropic damage model. As a by-product of present work we obtain, and use, an upper bound of the distance to orthotropic symmetry class in 2D elasticity.
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Dates et versions

hal-03229227 , version 1 (21-05-2021)

Identifiants

  • HAL Id : hal-03229227 , version 1

Citer

Cécile Oliver Oliver-Leblond, Rodrigue Desmorat, Boris Kolev. From discrete to continuum modelling of crack induced anisotropy in concrete. WCCM-ECCOMAS 2020, Jan 2021, Paris, France. ⟨hal-03229227⟩
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