Experimental FLC Determination of High Strength Steel Sheet Metal

Abstract

To assess formability in sheet forming, experimentally determined Forming Limit Curves (FLC) are often used. These conventional FLCs represent the forming limits (i.e. onset of necking) of a sheet material subjected to in-plane deformation or almost in-plane deformation. A widely used approach to experimentally determine the onset of necking of sheet material subjected to in-plane and almost in-plane deformation is formulated in ISO 12004. The aim of this work is to investigate limit strains for deep drawing quality sheet metal of HX180BD made by ArcelorMittal with nominal thickness 0.6 mm. The FLC curve has been measured by implementation of Nakajima test on universal testing machine Erichsen 145-60. The Nakajima test has been measured according to EN ISO 12004-2. Limit strains have been measured using 3D photogrammetric system ARAMIS by GOM. Forming limit curve was evaluated both the section method and the time dependent technique. The resulting experimental FLC curves were compared. With the time based method for the determination of FLC a greater strain values was achieved.

Changes in the mechanical properties and microstructure of anisotropic austenitic stainless sheet steel after uniaxial tensile test

“…Many research teams [1,2] are dealing with the problem of the unequal deformation of sheet metal materials during the technological process of manufacturing of different parts. One of the aspects in turns of cold plastic deformation is the unequal thickness reduction during the complex loading schemes that leads to earlier destruction of the material.…”

Influence of friction condition on failure location of AA5754 aluminium sheet in Nakajima test

“…This is understandable, since different failure criteria can lead to different FLCs. For example, according to [5,7], the criteria of the time dependent methods predict higher critical strains than other methods.…”

“…To improve the quality of sheet metal forming analysis, some works on failure analysis have been reported by the authors in [5][6][7]. In these works, various procedures for limit strain prediction are discussed, such as theoretical/analytical methods, experimental methods, and FE simulations.…”

Mechanical Properties Laser Welding Automotive Steel Sheets

“…Compared to a titanium grade the niobium stabilized IF steel exhibits always finer grain size and thus higher yield strength. The finer grain size derives from the already finer grain size in the hot strip material as a result of niobium's role to retard the austenite recrystallization during the final rolling passes [8].…”