Influence of the hydrostatic and the deviatoric components of stress on ductility of metals

Corallo, D. and La Rosa, G. and Mirone, G. (2009) Influence of the hydrostatic and the deviatoric components of stress on ductility of metals. Il nuovo cimento C, 32 (1). pp. 39-53. ISSN 1826-9885

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Failure of ductile metals occurring as microvoids growth is known to strongly depend on the stress triaxiality parameter which is a conventional measure of the first stress invariant normalized with respect to the equivalent von Mises stress, which in turn is a conventional measure of the second stress invariant. The triaxiality parameter is usually assumed to not influence the stress-strain behavior of metals according to the von Mises plasticity. The effects of the Lode angle and of the stress triaxiality are investigated here with regard to ductile failure and to the stress-strain behavior. Experimental results and numerical predictions are compared for different metals and different specimen geometries, by investigating about various failure criteria and a procedure for the post-necking stress-strain characterization. Tensile specimens and notched plates are loaded up to failure, then finite elements simulations are verified by comparison with experimental data. The verified numerical data are then used to calculate local variables within the volume of failing specimens; the knowledge of these local variables enables to predict global and local failure conditions according to the selected failure models.

Item Type: Article
Uncontrolled Keywords: Cracks ; Deformation and flow ; Ductility; malleability ; Plasticity and superplasticity
Subjects: 600 Tecnologia - Scienze applicate > 620 Ingegneria e attivita' affini > 621 Fisica applicata; Ingegneria meccanica
Depositing User: Marina Spanti
Date Deposited: 24 Mar 2020 16:15
Last Modified: 24 Mar 2020 16:15

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