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Lecture

WEB 3D-anisotropic visco-elastic damage model for modeling alkali silica reaction damage at microscale

Wednesday (23.09.2020)
17:05 - 17:20 M: Modelling and Simulation 2
Part of:


Alkali silica reaction (ASR) damage is an important example of chemo-mechanical coupling [1]. Simulating it at the microstructure level needs a comprehensive constitutive model for multi-phase concrete. We represent a physical 3D non-symmetric rate dependent (visco-elastic) damage model. The proposed model can be characterized by (i) general anisotropic and non-symmetric response (ii) continuum damage (strain softening) (iii) recovery of elasticity for very fast or very slow processes (standard linear solid model employed as intact material) (iv) uncoupled volumetric and deviatoric

responses. The proposed model is an extension of the visco-elastic damage model

presented in [2].

In addition to the model’s formulation, its computational aspects are also discussed. The presented model can be used to predict the behavior of cement paste and, in its simplified form also for aggregates. Therefore, the proposed model is a suitable candidate for simulating ASR damage at the microstructure level.

The damage model used here is inspired by Mazars damage [3] model in which the contribution of tensile and compressive principal maximum load endured by the material are considered separately in order to distinguish crush (compression) and crack growth (tension) failure mechanisms.

The proposed constitutive law is tested using efficient solvers provided by the μSpectre platform in which a Fourier-Galerkin method [4, 5] is utilized for solving a strain loading problems in periodic media.

 

Speaker:
Ali Falsafi
École Polytechnique Fédérale de Lausanne EPFL
Additional Authors:
  • Dr. Till Junge
    EPFL