behavior of austenitic steels at different strain rates and temperatures ..... obtain the plastic strain rate tensor components as follows. Ëep ij ¼. 3Ëep r. 2req exp Ð.
Mechanics of Materials 41 (2009) 1277–1287
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Finite-element and finite-difference simulations of the mechanical behavior of austenitic steels at different strain rates and temperatures R.R. Balokhonov a,*, V.A. Romanova a, S. Schmauder b a b
Institute of Strength Physics and Materials Science, SB, RAS, 634021 Tomsk, Russia Institut für Materialprüfung, Werkstoffkunde und Festigkeitslehre, University of Stuttgart, Germany
a r t i c l e
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Article history: Received 12 June 2008 Received in revised form 31 July 2009
a b s t r a c t Presented in this paper are the computational results on deformation of austenitic steels at different strain rates and temperatures. To describe the dynamic response of steels a relaxation constitutive equation was developed using a thermomechanical physically-based model. On the base of experimental data on uniaxial loading of new steels in the range of strain rates from 0.001 to 500 s1 the model parameters were derived, and dynamic responses of the steels were predicted, within the range of strain rates up to 8000 s1 and at initial temperatures from 77 to 600 K, with the strains exceeding 60% being calculated. A plane stress analysis was performed using the ABAQUS finite-element procedure with a user-defined subroutine developed. The physically-based model was developed to take into consideration an evolution of the dislocation density and the Lüders band propagation. Plane strain simulations of thermomechanical response of HSLA-65 steel were carried out for different strain rates and initial temperatures at the initial stage of compression (strain
