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• W2897619119 endingPage "012005" @default.
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• W2897619119 abstract "Forming limit diagrams (FLDs) are generally used to reflect the strain limits of sheet metal materials. These diagrams contain essential information for planning of high series stamping processes, however the experimental definition is still a difficult and time-consuming procedure. Five or more samples are needed to cover the different strain paths sufficiently, from pure shear (ε1 = -2ε2) up to biaxial stretch forming (ε1 = ε2), moreover the experimental detection of the onset of local necking depends on the capability of the measuring equipment and person. The determination of the measurement results is further complicated by the material and other influencing conditions, like strain path (deformation history), rolling direction, sheet thickness, temperature, measuring grid size, tool surfaces, friction and vibrations. All these things supports the development of clearly theoretical and semi-empirical models for defining FLDs. This paper presents a comparative study of some kind of well-known theoretical models and experimental FLDs of automotive dual phase (DP) thin sheets. The experimental determination was carried out by Nakajima tests on five different sample geometries. We used follow-up strain analysis on the cracked samples. The results highlighted that most of the theoretical and semi-empirical models can be appropriately used in the negative quadrant of the FLD despite of the effect of the friction. However, in the positive quadrant, there are some more visible deviations due to outer conditions like lubricant." @default.
• W2897619119 created "2018-10-26" @default.
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• W2897619119 date "2018-10-18" @default.
• W2897619119 modified "2023-09-23" @default.
• W2897619119 title "Comparative study on theoretical and experimental evaluation of forming limit diagrams" @default.
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• W2897619119 doi "https://doi.org/10.1088/1757-899x/426/1/012005" @default.
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