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  • On the importance of visco-plastic material properties in the structural and instability analyses of first wall components of a tokamak fusion reactor


The theory of visco-plasticity based on total strain and overstress developed by Cernocky and Krempl has been used for the development of a numerical model that can predict the sensitivity to the rate of loading of a fusion reactor candidate material, namely stainless steel type AISI 316L. The constitutive model has been implemented within two transient finite element computer codes, using a stress update algorithm (based on the elastic predictor-return mapping concept) originally developed for linear viscosity by Simo and Ortiz and extended to non-linear viscosity cases. The calibration of the model under monotonic and cyclic loading conditions was based on experimental data obtained at JRC/Ispra. In order to demonstrate the significant effect of the rate of loading on structural behaviour, numerical examples are presented based on non-linear visco-plastic behaviour and, for comparison purposes, inviscid plasticity.

Additional information

Authors: YOUTSOS A G, JRC Petten (NL)
Bibliographic Reference: Paper presented: First National Congress on Computational Mechanics (GR), September 3-4, 1992
Availability: Available from (1) as Paper EN 36860 ORA
Record Number: 199210798 / Last updated on: 1994-12-02
Original language: en
Available languages: en