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This paper deals with an original study on serration, supposed to be the result of residual stresses in the strip metal edge,
due to edge trimming and revealed during the cold rolling process. The aim of this research work is to predict the formation
of serration and the finite element methodology will be used to model edge trimming. The first part...
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Citations
... For example, the coupled ductile fracture criteria considering damage accumulation induced by the evolution of microvoids, including the modified Gurson Tvergaard Needleman (GTN) model [23], and Lou-Huh model [24], have been successfully applied in the simulation of the shearing process. Additionally, uncoupled ductile fracture criteria, including the Cockcroft and Latham model [25][26][27], Modified Mohr-Coulomb (MMC) model [28][29][30], and Oyane model [31], have also been employed to characterize the fracture behavior in the shearing process. Compared with the coupled criteria, the uncoupled criteria are preferred for industrial applications due to their simplicity. ...
Ultra-high-strength quenching and partitioning (Q&P) steels have achieved remarkable lightweight effect in automotive manufacture due to the excellent mechanical performances. However, the problem of sheared-edge cracking greatly limits their application. In this work, the damage generated in the shearing process of QP980 steel is experimentally investigated via microstructure characterization and micro-/macromechanical property evaluation. Moreover, the shearing deformation is simulated with six widely used damage models. The experimental results reveal that microvoids, microcracks, and work-hardening behavior are the main damage factors affecting the formability of sheared edges. Microvoids mainly formed at phase interfaces have a small size (≤5 μm), while microvoids generated from inclusions with a small number have a large size (>5 μm). As deformation continuously grows, microvoids distributed around the sheared surface are split into microcracks, which act as crack initiators in the subsequent forming step. Additionally, the highest microhardness in the fracture zone further enhances the susceptibility of edge cracking. Furthermore, the optimum damage model for QP980 steel was determined by developing user-defined subroutine VUSDFLD in Abaqus, which can be used in the prediction of fracture behavior of QP980 steel to reduce the risk of edge cracking.
... The aim of this paper is to develop a modeling strategy in order to study a sequence of two steel strip working processes, by means of the Finite Element Method. The first process is modeled using the plane strain assumption to reduce computations costs (Hubert et al., 2009). It is followed by a second process, which is modeled in 3D since the regions of interest for the results analysis are not in-plane. ...
... The identification of the material parameters K and m, performed on tensile specimens, showed a strong dependency of the material to damage (Hubert et al., 2009). It has been decided to develop a user material subroutine to take into account the elastoplastic behavior coupled to a damage law. ...
... Due to angles˛1 and˛2, the path of a given point on the upper knife edge evolves in 3D and thus, the edge-trimming process should be modeled in three dimensions. In a previous study, Hubert et al. (2009) showed that modeling the edge-trimming process in 3D gives roughly the same results as a 2D plane strain computation, especially in terms of final equivalent plastic strain on the cut edges. Moreover, the computation time for a 30 mm long strip is several days on a SGI Altix XE1200 with 16 dual core processors. ...
In small deformation with hot rolling process, metals and alloys are subjected to complex stresses, strain, strain-rate, stress flow, pressure, tensile triaxiality stress and compressive triaxiality stress which make it very complex to analyse. Study of damage in small deformation with hot rolling is important for manufacturing for development of defect free products. Damage is an attributed to crack and fracture during process in material. Triaxiality stress especially compressive triaxiality stress develops the tendency of fracture in material during the hot rolling process. In the present study, FE simulation of hot rolling process for small deformation has been carried out by using commercial available ABAQUS/Explicit software. Damage during the small deformation has been examined and salient conclusions are drawn.
