Material modelling input into the FEM code (3)

The NN material behaviour prediction is introduced into the FEM code according to the following procedure
The work hardening, temperature and strain rate effects on the flow stress must be computed, i.e. table(x), table(y) and table(z) are needed
These tables can be calculated by considering the stress as the product of a function of strain, a function of temperature and a function of strain rate and by neglecting the coupling effects
Thus, the flow stress is given by:

This work a part of a wider scope research on the thermo-mechanical coupled FEM simulation of AISI 1010 C steel machining
The material rheological behaviour was modelled through a NN approach able to account for the real effects of strain hardening, strain rate and temperature dependencies of the workpiece material into the FEM analysis
By utilizing a learned NN endowed with the knowledge on flow stress of the AISI 1010 C steel, the work material properties can be provided to the FEM code for each node of the workpiece mesh during the simulation
The enormous potential of NN material modelling can be exploited in the simulation of processes, like metal cutting, where classical material description is unsatisfactory
To achieve this results, a continuous information exchange between the learned NN and the FEM code during each iteration must be achieved