Results 211 to 220 of about 1,062 (237)

An Approach for Prediction of Coil Specific Forming Limit Curves

BHM Berg- und Hüttenmännische Monatshefte, 2019
Forming 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, Jari Larkiola, Mikko Palosaari   +2 more
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Forming limit curves: Out-of-plane and in-plane stretching

Journal of Mechanical Working Technology, 1982
Abstract The study of deformation and failure of biaxially stretched sheets is of considerable practical interest in the area of sheet metal press forming. During biaxial stretching of sheet metal, the uniform plastic straining regime is often followed by a localised plastic straining regime which finally leads to fracture. The technique of analysing
A.R. Ragab, B. Baudelet
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Prediction of Forming Limit Curves from Hardness for Steels

Journal of Materials Engineering and Performance, 2016
This paper presents a method for predicting the strain-based forming limit curve (FLC) for steels using hardness. The stretching side (positive minor strain component) of the FLC was calculated by using a Marciniak-Kuczynski model with a non-quadratic yield function, while the drawing side (negative minor strain component) of the FLC was predicted ...
Erik J. Pavlina, Chester J. Van Tyne
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An investigation of the strain path dependence of the forming limit curve

International Journal of Solids and Structures, 1982
Abstract 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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Modelling of Metal Formability in Forming Processes (Forming Limit Curves-FLC)

2003
The 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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Formability Limiting Curve of Mild Steel by Explosive Forming

1990
At the advent of increasing interest in high velocity forming techniques, the knowledge of maximum extent of formation without the risk of any failure becomes necessary. A Formability Limit Curve will represent a critical level curve separating FAIL region from SAFE region.
K. Raghukandan, P. V. Vaidyanathan, M. Rathinasabapathi   +2 more
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Pre-strain correction of forming limit curves

Materials Research Proceedings
Abstract. 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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Influence of strain path on the forming-limit curve in aluminum

Metallurgical and Materials Transactions A, 2005
The 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 Innovative Procedure for the Experimental Determination of the Forming Limit Curves

2015
A 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, Lazarescu, Lucian, Comsa, Dan-Sorin   +2 more
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Development of Forming Limit Curves for Aerospace Aluminum Alloys

1978
The 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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