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See detailMaterial behavior of the hexagonal alpha phase of a titanium alloy identified from nanoindentation tests
Gerday, Anne-Françoise ULg; Ben Bettaieb, Mohamed ULg; Duchene, Laurent ULg et al

in European Journal of Mechanics A : Solids (2011), 30

This article focuses on the numerical modeling of nanoindentation tests performed on the hexagonal a phase of Ti-5553 alloy in order to identify its mechanical behavior. The main goal consists in ... [more ▼]

This article focuses on the numerical modeling of nanoindentation tests performed on the hexagonal a phase of Ti-5553 alloy in order to identify its mechanical behavior. The main goal consists in determining the relative strength of the slip modes in the a phase of Ti-5553. This work was performed using an elastoviscoplastic crystal plasticity-based constitutive law. The difficulties in determining the slip systems that can be activated and their corresponding critical resolved shear stresses (CRSS) are discussed. Numerical predictions are compared to experimental nanoindentation curves. [less ▲]

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See detailAnalysis of the sensivity of FEM predictions to numerical parameters in deep drawing simulations
Duchene, Laurent ULg; Habraken, Anne ULg

in European Journal of Mechanics A : Solids (2005), (24), 614-629

In this study, deep drawing finite element (FE) simulations are compared with experimental results. The steel grade, the geometry and the parameters of the experimental deep drawing processes are detailed ... [more ▼]

In this study, deep drawing finite element (FE) simulations are compared with experimental results. The steel grade, the geometry and the parameters of the experimental deep drawing processes are detailed in this paper. Particular attention is paid to numerical models. The main part of the article is dedicated to a broad sensitivity study. The influence of several numerical parameters on the predicted punch force and earing profile is analysed. A quadratic [Hill, R., 1948. A theory of the yielding and plastic flow of anisotropic metals. Proc. Roy. Soc. London Ser. A 193, 281–297] constitutive law is compared with more sophisticated micro-macro constitutive laws. The sensitivity of these laws to the initial data characterizing material behaviour is presented. A significant influence of the FE type and the number of FE layers is noticed. Finally, it also appears that friction parameters (penalty coefficient and Coulomb friction coefficient) have a significant influence on numerical results. The low anisotropy of the steel sheet increases the influence of several numerical parameters. That influence would not be observed with a highly anisotropic steel. [less ▲]

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See detailCoupled thermo-mechanical-metallurgical analysis during the cooling of steel pieces
Habraken, Anne ULg; Bourdouxhe, M.

in European Journal of Mechanics A : Solids (1992), 11(3), 381-402

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See detailA note on the response to simple shear of elasto-plastic materials with isotropic hardening
Cescotto, Serge ULg; Habraken, Anne ULg

in European Journal of Mechanics A : Solids (1991), 10(1), 1-13

Detailed reference viewed: 13 (1 ULg)