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Determining a probabilistic forming limit curve
AIP Conference Proceedings, 2013Forming Limit Curves are surrounded by uncertainty - in particular the uncertainty surrounding the calculation of limit strains from experimental data. The position dependent method outlined in ISO12004-2 is known to make assumptions regarding the behavior of sheet metal at the onset of necking.
N. Small +6 more
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Forming Limit Curves for Complex Strain Paths
Archives of Metallurgy and Materials, 2013This paper presents results of experimental studies of forming limit curves (FLC) for sheet forming under complex strain paths. The Nakazima-type formability tests have been performed for the as-received steel blank and for the blank pre-strained by13%.
J. Rojek +5 more
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Experimental and numerical investigations on forming limit curves in micro forming
Advances in Materials and Processing Technologies, 2020The Forming limit diagram is an important tool in metal forming processes, as it indicates the failure limits for ductile damage and onsite necking.
Gyan Patel +2 more
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Limiting Functional Forms for Market Demand Curves
Econometrica, 1972On the basic assumption that individual consumption of a good is a stochastic phenomenon, the first part of this article shows that under general conditions market quantity demanded is asymptotically (as n, the number of individuals in the market, increases) distributed as normal with mean and variance a function of own price given all other prices and
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2011
In a deforming sheet, the strain state is defined as the ratio between minor strain and major strain. The formability depends on this strain state and can be expressed as the so-called forming limit curve (FLC). In complex strain states the deformation is limited by an instability just as in a tensile test. In cases of negative minor strain this can be
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In a deforming sheet, the strain state is defined as the ratio between minor strain and major strain. The formability depends on this strain state and can be expressed as the so-called forming limit curve (FLC). In complex strain states the deformation is limited by an instability just as in a tensile test. In cases of negative minor strain this can be
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AIP Conference Proceedings, 2011
Forming limit strains of 270 MPa grade cold rolled steel sheet have been precisely measured under linear and combined strain paths using a newly developed, double‐action punch‐stretching testing apparatus. In the combined strain paths, the test material is subjected to equibiaxial tension followed by plane‐strain tension.
Fuminori Sugawara +7 more
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Forming limit strains of 270 MPa grade cold rolled steel sheet have been precisely measured under linear and combined strain paths using a newly developed, double‐action punch‐stretching testing apparatus. In the combined strain paths, the test material is subjected to equibiaxial tension followed by plane‐strain tension.
Fuminori Sugawara +7 more
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Determination of Forming Limit and Fracture Limit Curves Using Digital Image Correlation
SAE International Journal of Materials and Manufacturing, 2014<div class="section abstract"><div class="htmlview paragraph">Forming limit curve (FLC) and fracture forming limit curve (FFLC) are valuable tools for failure prediction in forming simulation and die try-out in press shops. In this paper, methods are presented to determine FLC and FFLC for sheets of advanced high strength steels (AHSS ...
Gang Huang +2 more
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Improved predictability of forming limit curves through microstructural inputs
International Journal of Material Forming, 2009Forming Limit Curves (FLCs) were determined experimentally through limiting dome height (LDH) tests in AA1050, AISI 316L and AISI 304L. FLCs were also simulated through FE (finite element) analysis. Simulations involved both constant and varying (with strain and strain path) material properties — namely, strain hardening exponent (n) and normal ...
S. K. Mishra +4 more
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Calculation of the forming limit curve at fracture
Journal of Materials Science, 1983The prediction of the forming limit diagram at fracture (FLDF) is of great importance, specially in cases where forming is controlled by fracture instead of necking. A physical model of coalescence is proposed in two cases of internal damage: (i) damage by decohesion of the particle matrix interface, and (ii) damage by failure of the particle.
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Prediction of Forming Limit Curves from Hardness for Steels
Journal of Materials Engineering and Performance, 2016This 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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