naa a22 4500 51079064X CHVBK 20180411083318.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s12289-011-1068-1 doi (NATIONALLICENCE)springer-10.1007/s12289-011-1068-1 Determination and validation of micro-forming limit diagrams for very thin materials [Elektronische Daten] [Ndèye Sène, Pascale Balland, Robert Arrieux, Pierre Vacher] As a result of an increasing industrial demand for very small parts, this paper proposes an extension of the concept of forming limit diagrams for very thin sheets (thicknesses of 0.1mm) called micro-forming limit diagrams (MFLD). A specific drawing tool of small size was designed and subsequently achieved in the laboratory. The formability of a rolled and annealed 1050A aluminum sheet (99.5%) was characterized and analyzed. Seeing the size of the specimen and the tool, the spacer is replaced by a central electro-discharged smaller thickness. The micro-forming press was coupled with a system for strain measurements based on image analysis with a correlation method. After experimental tests with 7 different geometries, the strains were determined at the beginning of the necking from the various images. Based on this, three methods of determination of the MFLD were proposed (white pixel emergence, polynomial method and strain profile analysis) and compared. Finally, an experimental deep drawing cylindrical cup test rendered it possible to validate the most accurate method for determining the micro-forming limit diagram. Springer-Verlag France, 2011 Thin sheet material nationallicence Micro-deep drawing nationallicence Micro-forming limit diagrams nationallicence Sène Ndèye Laboratoire SYMME, Polytech Annecy-Chambéry, Université de Savoie, BP 80439, 74944, Annecy le Vieux, Cedex, France aut Balland Pascale Laboratoire SYMME, Polytech Annecy-Chambéry, Université de Savoie, BP 80439, 74944, Annecy le Vieux, Cedex, France aut Arrieux Robert Laboratoire SYMME, Polytech Annecy-Chambéry, Université de Savoie, BP 80439, 74944, Annecy le Vieux, Cedex, France aut Vacher Pierre Laboratoire SYMME, Polytech Annecy-Chambéry, Université de Savoie, BP 80439, 74944, Annecy le Vieux, Cedex, France aut International Journal of Material Forming Springer-Verlag 6/1(2013-03-01), 41-48 1960-6206 6:1<41 2013 6 12289 https://doi.org/10.1007/s12289-011-1068-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12289-011-1068-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sène Ndèye Laboratoire SYMME, Polytech Annecy-Chambéry, Université de Savoie, BP 80439, 74944, Annecy le Vieux, Cedex, France aut NATIONALLICENCE 700 1- Balland Pascale Laboratoire SYMME, Polytech Annecy-Chambéry, Université de Savoie, BP 80439, 74944, Annecy le Vieux, Cedex, France aut NATIONALLICENCE 700 1- Arrieux Robert Laboratoire SYMME, Polytech Annecy-Chambéry, Université de Savoie, BP 80439, 74944, Annecy le Vieux, Cedex, France aut NATIONALLICENCE 700 1- Vacher Pierre Laboratoire SYMME, Polytech Annecy-Chambéry, Université de Savoie, BP 80439, 74944, Annecy le Vieux, Cedex, France aut NATIONALLICENCE 773 0- International Journal of Material Forming Springer-Verlag 6/1(2013-03-01), 41-48 1960-6206 6:1<41 2013 6 12289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer