Prediction of the limit strains of sheet steel thermally and mechanically worked in relation to surface integrity changes: A theoretical model

A theoretical model is proposed to predict the limit strains and the forming-limit diagrams both in the first (I) and in the second (II) quadrants of the strain locus of thin sheets subjected to biaxial stretching. Based on the Marciniak-Kuczynski model and employing the non-quadratic m-yield criter...

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Bibliographic Details
Published in:Journal of materials processing technology 1991-02, Vol.25 (1), p.15-33
Main Authors: Mamalis, A.G., Karafillis, A.P., Vaxevanidis, N.M.
Format: Article
Language:English
Subjects:
sheet metalworking
steel
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Summary:A theoretical model is proposed to predict the limit strains and the forming-limit diagrams both in the first (I) and in the second (II) quadrants of the strain locus of thin sheets subjected to biaxial stretching. Based on the Marciniak-Kuczynski model and employing the non-quadratic m-yield criterion, the proposed model also correlates surface integrity changes resulting from mechanical processing; either low-speed directional rolling or stochastic ball-drop forming and thermal stochastic electro-discharge machining. Theoretical predictions and experimental data from previous work are compared and the suitability of the theoretical model in studying the deformation behaviour in sheet metal forming is discussed.
ISSN:0924-0136
DOI:10.1016/0924-0136(91)90100-S