A coupled-hyperelastic constitutive approach for modelling the mechanical behaviour of crushable granular soils
A coupled-hyperelastic constitutive approach for modelling the mechanical behaviour of crushable granular soils
Particle breakage plays a fundamental role in the mechanical response of specific granular materials, and the corresponding effects could be incorporated into finite element simulations. Hence, accurate constitutive models are required for the mechanical description of soils with breakable grains. This study presents a hyperelastic constitutive model, which predicts the elastic response of crushable granular soils in a thermodynamically consistent frame. A revised free energy function is employed to derive the hyperelastic description of the material within the yield surface, incorporating an internal variable representing the particle size. In order to quantify the extent of particle breakage, a breakage index as a function of plastic shear strain and void ratio is used. The breakage index acts as a coupling variable by capturing the effect of plastic strain on the elastic properties of the soil in terms of an elastoplastic coupling mechanism. The performance of the new constitutive formulation in terms of response envelopes has been compared to experimental results on Karlsruhe Fine Sand (KFS).
Nazanin Irani; Merita Tafili; Luis Felipe Prada-Sarmiento; T. Wichtmann
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
1. Constitutive modelling for saturated and unsaturated soils
https://doi.org/10.53243/NUMGE2023-178
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