TY  - BOOK
AU  - Ahmed Awadallah Ahmed Elsayed Mowafy
AU  - Alexander Tatarczyk , 
AU  - Nahed Elmahallawy , 
AU  - Rainer Hank , 
TI  - Determination of parameters to manipulate the evenness of perforated sheets with non-circular contours of holes / 
PY  - 2013///
CY  - Cairo : 
PB  - Ahmed Awadallah Ahmed Elsayed Mowafy , 
N1  - Thesis (M.Sc.) - German University - Faculty of Postgraduate Studies and Scientific Research - Department of Design and Production Engineering
N2  - During the punching operation the work piece is subjected to residual stresses. A compressive layer of residual stresses is formed on the top side while a tensile residual stress layer is formed on the lower surface of the sheet, which create a bending moment on the sheet which lead to its unevenness. The unevenness can be stated as the non-flatness of the sheet metal on a flat surface
UR  - http://172.23.153.220/th.pdf
ER  -