Abstract
b An alternative procedure for the determination of the FLC 0 value, the limit strain value corresponding to the plane strain mode of the Forming Limit Curves (FLC), a critical parameter in the sheet formability analysis, is suggested and compared with conventional Nakazima simulation tests. The procedure was tested using two different materials: interstitial-free quality steel (IF) and a spheroidized SAE 1050 steel. The intrinsic tensile test, in a near plane strain state, was performed using a small number of samples, with dimensions suggested by the literature. The results were checked against Nakazima test results using the same materials. The plane strain test was reliable in determining consistent FLC 0 values and should be preferred since it is not affected by the geometric aspects and by friction, which do affect the Nakazima test. The reliability of the FLC 0 values obtained by near plane strain was also corroborated through comparison with literature data.
Highlights
IntroductionThe last decade saw an increasing interest in the understanding of the physical metallurgy associated with the evolution (during straining) of both microstructure (damage accumulation/microvoids evolution) and crystallographic texture, aiming at locating the yield point and, ductile fracture during sheet metal drawing[1,2]
The last decade saw an increasing interest in the understanding of the physical metallurgy associated with the evolution of both microstructure and crystallographic texture, aiming at locating the yield point and, ductile fracture during sheet metal drawing[1,2]
The objective of this work is to evaluate the possibility of replacing Nakazima tests by a fast and safe determination of the FLC0 value through tensile tests that will lead to near plane strain deformation, using a smaller number of samples
Summary
The last decade saw an increasing interest in the understanding of the physical metallurgy associated with the evolution (during straining) of both microstructure (damage accumulation/microvoids evolution) and crystallographic texture, aiming at locating the yield point and, ductile fracture during sheet metal drawing[1,2]. This interest relies on the support of true stress - true strain curves, on using alternative flow criteria (quadratic and nonquadratic) and on using Forming Limit Curves FLCs, i.e., on characteristics of the material to be drawn.
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