Reference : Study of bendability of steel sheets
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Study of bendability of steel sheets
Ben Bettaieb, Mohamed mailto [Université de Liège - ULiège > Département Argenco : Secteur MS2F > Département Argenco : Secteur MS2F >]
Lemoine, Xavier [ > > ]
Duchene, Laurent mailto [Université de Liège - ULiège > Département Argenco : Secteur MS2F > Département Argenco : Secteur MS2F >]
Habraken, Anne mailto [Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo >]
Steel Research International
Verlag Stahleisen GmbH
[en] bendability ; Gurson law ; semi-analytical model ; LIMARC
[en] In the present contribution bending tests are modeled and the bendability of steel sheets is evaluated. Bendability refers to the ratio of the minimum bend radius to the initial sheet thickness at which the bending proc-ess is successfully accomplished [1]. The metallurgic microstructure of the studied sheet consists in two principal phases: a fully dense matrix (which may be itself composed by several metallurgic phases) and spherical voids. For that purpose, the Gurson Tvergaard Needleman law ([2], [3], [4]) is used and significantly modified. The behavior of the fully dense matrix is de-fined by the anisotropic Hill 48 function and the Swift hardening law. The width of the sheet is assumed to be large enough to neglect the transversal strains and the stress component in the thickness direction is also neglected. The bending operation can thus be modelled by a plane strain-plane stress loading. The influence of mechanical pa-rameters such as the initial porosity, the Lankford coefficient and the strain harden-ing exponent on the bendability is studied herein. The failure here is defined by the onset coalescence of neighbour voids and is checked by using Thomason [5], Pardoen [6] and Brunet [7] coalescence models. So the influence of other phenomena (like the shear band development and the localized necking) on the bendability is neglected here.

File(s) associated to this reference

Fulltext file(s):

Open access
Study of bendability of steel sheets (2008).pdfAuthor postprint157.66 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.