A mean-field model for trip - algorithms and parameter identification

Abstract eng:
Recently a meso-macro mean-field model formulated in the framework of viscoplasticity, including backstress effects, has been proposed to depict the effects of transformation induced plasticity (TRIP) in Maraging steels for non-proportional loadings [1]. This model has now been implemented in an implicit return-mapping formalism in the finite element code Zebulon. The implementaion is discussed and the stability of the solution as a function of the time step is compared to an explicit solution. Performance tests for fully implicit and mixed implicit-explicit solutions are carried out on larger structures. Local divergence issues, arising from the application of the Newton-Raphson scheme and the strong coupling between the phase fraction and evolution equations are discussed. As a next step a micro-scale model incorporating realistic transformation strains for lath martensite and crystal plasticity is developed, for the calibration of the macroscopic transformation yield function as well as stress and temperature dependent kinetics.

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