Investigation of Material Flow During Linear Flow Splitting Using Tracer Diffusion Experiments and Finite‐Element Simulations. Issue 6 (17th March 2021)

• Record Type: Journal Article
• Authors: Ahmels, Laura; Dehtyriov, Daniel; Bruder, Enrico; Molotnikov, Andrey
• Is Part Of: Advanced engineering materials. Volume 23:Issue 6(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-17
• Subjects: finite-element modeling -- linear flow splitting -- severe plastic deformation; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.202100014
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : The deformation behavior and evolution of strain distributions of flat metal sheets subjected to the high‐strain forming process of linear flow splitting (LFS) are studied using experimental and numerical techniques. The new tracer gradient method for the mapping of material flow based on diffusional concentration gradients is proposed. The method is validated using theoretical predictions for rolling of a sheet and shown to overcome the limitations of previous techniques. A parametric finite‐element model for LFS of a HC800LA grade steel is developed and validated against the results of the tracer gradient method. A sensitivity study is undertaken to investigate the effects of strain‐hardening behavior and sheet thicknesses on the LFS process. A good agreement between experimental and numerical results is obtained, with the friction between rolls and sheet found to be a critical parameter in the modeling of the process. It is further observed that the formation of the characteristic steady state in the LFS process is linked to the material‐hardening behavior and not the geometry of the sheet. Abstract : A newly developed tracer gradient method in combination with finite‐element simulations is used to track the material flow in the linear flow splitting (LFS) process up to severe plastic strains. This allows new insights into the LFS process regarding the relation between processing and material parameters and the evolution of a steady state of deformation.