PREDICTION OF LOCAL NECKING LIMIT CURVE IN SHEET METAL FORMING

The present work examines the mathematical models for the industrial processes involving biaxial stretching and drawing of sheet metal such as deep drawing and stamping operations, aiming at obtaining the theoretical forming limit strain curve or the local necking limit curve for the final shaped pr...

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Bibliographic Details
Published inJournal of machining and forming technologies Vol. 3; no. 1/2; p. 101
Main Author Bressan, José Divo
Format Journal Article
LanguageEnglish
Published Hauppauge Nova Science Publishers, Inc 01.01.2011
Subjects
Computer programs
Costs
Formability
Forming
Laboratories
Mathematical models
Mechanical properties
Metal forming
Necking
Sheet metal
Software
Stamping
Strain
Stress-strain curves
Studies
Titanium alloys
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Summary:The present work examines the mathematical models for the industrial processes involving biaxial stretching and drawing of sheet metal such as deep drawing and stamping operations, aiming at obtaining the theoretical forming limit strain curve or the local necking limit curve for the final shaped product. Historically, sheet metal formability has been assessed by simple laboratory testing such as the Erichsen test. Lately, the concept of experimental Forming Limit Curve was developed to evaluate formability. Some experimental results of forming limit curve obtained from literature for steel sheets are compared with the theoretical predicted curves. A new model for the theoretical prediction of the forming limit curve, based on the D-Bressan model for the development of the initial thickness defects and material properties which generates a strain gradient and ends in the local necking and sheet metal rupture, is analysed. Limit strains are obtained from a software developed by the author.
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ISSN:1947-4369