Modelling and numerical simulation of the anode compaction process at laboratory scale

摘要

This work deals with the modelling and numerical simulation of the anode compaction process at laboratory scale.For this purpose, a finite-strain viscoplastic constitutive law was developed and implemented in Abaqus software.It was based on the thermodynamic framework and the multiplicative decomposition of the deformation gradient into its elastic and irreversible deformation parts.The permanent deformation was characterized using a dissipation potential.The state of stress was defined through a Helmholtz free energy.To characterize the mechanical behaviour of the anode paste, compaction tests using a thin mould wall were carried out at 150°C.An inverse identification procedure using finite element method showed that the proposed constitutive model reproduces experimental trends.Compaction tests using complex geometries such as slots and stub holes were carried out in order to evaluate model predictive capabilities.Numerical simulations show that the model predicts quite successfully the density distribution of the anode paste obtained through the CT scan.