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Advanced Models for the Prediction of Forming Limit Curves
2016During the forming of flat sheet metal into a more complex shape, a number of plastic instabilities may occur subsequently. A ‘plastic instability’ occurs when the zone of plastic deformation is suddenly confined to a smaller zone. The first plastic instability which usually occurs in forming processes is the onset of diffuse necking, in which plastic ...
Dorel Banabic +4 more
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Effect of friction in stretch forming and its influence on the forming limit curve
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2014Formability is an important property requirement in sheet metal forming and mostly useful to automobile and aerospace industries. Every product design starts with finite element simulation before the die design and material selection stage. The forming limit curve along with finite element results acts as tool to investigate whether the design is ...
G Manikandan +2 more
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An Approach for Prediction of Coil Specific Forming Limit Curves
BHM Berg- und Hüttenmännische Monatshefte, 2019Forming limit curves (FLCs) are widely used for predicting failure in sheet metal forming operations. FLCs are determined in the laboratory according to ISO 12004‑2 using the Nakajima test. The testing procedure involves stretching a series of dog-bone shaped blanks with a hemispherical punch until failure occurs.
Timo Manninen +2 more
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A few methods of analytical calculation of forming-limit curves
Journal of Materials Processing Technology, 1995Abstract The main aim of the present work is the modification of analytical calculation methods for forming limit curves. The calculated curves were compared with experimental data for steel and aluminium sheets and the best modifications were chosen.
Jerzy Gronostajski, Zbigniew Zimniak
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An Innovative Procedure for the Experimental Determination of the Forming Limit Curves
2015A new procedure for the experimental determination of the FLCs has been proposed. The procedure is based on the hydraulic bulging of two specimens. The upper blank has a pair of holes pierced in symmetric positions with respect to the center, while the lower blank acts both as a carrier and a deformable punch. By modifying the dimensions and reciprocal
Banabic, Dorel +2 more
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Pre-strain correction of forming limit curves
Materials Research ProceedingsAbstract. Inherent features of the Nakajima test to determine forming limit curves (FLC) are inevitable bending strains and pre-strains originating from evolving punch contact in the early stage. Both effects are very annoying and bias the resulting FLC considerably, so that a direct comparison of materials with different gauges is impossible.
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Modelling of Metal Formability in Forming Processes (Forming Limit Curves-FLC)
2003The basic purpose of formability modelling is the defining of mathematical models that are indispensable for simulation and determination of the formability limit of metals, that is, the limiting degree of deformation in forming processes. The results obtained indicate that the formability limit of metals is a great extent dependent on the state of ...
Jurković, Milan, Jurković, Zoran
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Influence of strain path on the forming-limit curve in aluminum
Metallurgical and Materials Transactions A, 2005The influence of a two-stage strain path on the forming-limit curve (FLC) in aluminum has been investigated. Uniaxial tensile straining followed by orthogonal uniaxial tensile straining decreases the forming-limit strains. Equibiaxial tensile straining followed by uniaxial tensile straining increases the forming-limit strains in the region of plane ...
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An investigation of the strain path dependence of the forming limit curve
International Journal of Solids and Structures, 1982Abstract The dependence of the forming limit curve on the deformation history is examined by considering two specific examples of sheet metal forming, representative of two classes of non-proportional strain path: one example is an axisymmetric punch stretching problem, which gives rise to a gradual variation in the strain path from a proportional ...
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Development of Forming Limit Curves for Aerospace Aluminum Alloys
1978The objective was to develop forming limit curve (FLCs),tensile(elastic and plastic) properties, and production stretch-form test data for two alloys. A laboratory technique developed by Hecker and his associates at General Motors Research Laboratories was used to develop FLCs for 2024-T3 and 2219-T31 aluminum alloys.
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