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Development and application of micromechanical material models for the characterization of materials
|Pineau, A.; Rousselier, G.:|
EUROMECH - MECAMAT '96. 1st European Mechanics of Materials Conference on Local Approach to Fracture
Les Ulis: Editions de Physique, 1996 (Journal de physique. 4 Colloque)
|European Mechanics of Materials Conference <1, 1996, Fontainebleau>|
| Conference Paper|
|Fraunhofer IWM ()|
The concept of the local approach is applied to different damage mechanisms of structural steels by micromechanical material models. Static and dynamic fracture resistance curves for a neutron-embrittled weld material are derived from tensile and Charpy-type specimens with the modified Gurson model. The behaviour of a test piece with a crack in the ferri tic base material beneath an austenitic cladding could well be predicted. A constitutive model for creep and creep rupture was developed, implemented in a finite element program and applied to tests on a 12 per cent Cr steel. The model is a combination of the viscoplastic Robinson model and a damage mechanics model. It is formulated with internal variables for isotropic and kinematic hardening and with a scalar damage parameter. The application of the model to modified C(T) specimen with different hole diameters shows a good agreement between the predictions and the experiments.