TY - JOUR

T1 - Numerical and experimental determination of cut-edge after blanking of thin steel sheet of DP1000 within use of stress based damage model

AU - Behrens, Bernd Arno

AU - Bouguecha, Anas

AU - Vucetic, Milan

AU - Krimm, Richard

AU - Hasselbusch, Tobias

AU - Bonk, Christian

N1 - Funding information: Though it was shown, that force versus time can be accurately predicted with the flow curve determined by a stack compression test. If only a tensile test is available Ludwig extrapolation brings insufficiently accurate results and another extrapolation should be used to handle high plastic strains. The modification of the fracture locus for negative stress triaxialities leads to some improvement of the determined sheared edge. Moreover, experiments show that velocity of punch does not influence the punching force. One possible explanation could be that the temperature increase in shearing zone leads to significant increase of yield stress and quasi adiabatic conditions. In the future further investigations should be carried out to determine real temperature field in shearing zone. The authors thank the DFG (German Research Foundation) for the financial support of the project “Experimentelle Analyse und Entwicklung eines Finite Elemente Modells zur verbesserten numerischen Abbildung des Scherschneidprozesses” (BE-1691/133-1).

PY - 2014/10/15

Y1 - 2014/10/15

N2 - The proposed study focuses on blanking of thin steel sheets of Dogal1000DP +Z100MBO. Numerical and experimental investigations of the influence of clearance and punch speed on the cutting force and the geometry of the sheared edge were done. Tensile and stack compression test at elevated temperatures has been chosen to determine the flow and fracture behavior of Dogal1000DP +Z100MBO at different stress states. It is shown that the flow curve determined by stack compression test leads to better results in force - displacement prediction of a blanking process compared to determination of flow curve by tensile test. Stress based fracture criterion were chosen to describe damage behaviour. Moreover significant influence of fracture locus for negative stress triaxialities on the geometry of the numerically predicted sheared edge is shown.

AB - The proposed study focuses on blanking of thin steel sheets of Dogal1000DP +Z100MBO. Numerical and experimental investigations of the influence of clearance and punch speed on the cutting force and the geometry of the sheared edge were done. Tensile and stack compression test at elevated temperatures has been chosen to determine the flow and fracture behavior of Dogal1000DP +Z100MBO at different stress states. It is shown that the flow curve determined by stack compression test leads to better results in force - displacement prediction of a blanking process compared to determination of flow curve by tensile test. Stress based fracture criterion were chosen to describe damage behaviour. Moreover significant influence of fracture locus for negative stress triaxialities on the geometry of the numerically predicted sheared edge is shown.

KW - Blanking

KW - Damage

KW - Dual phase steel

KW - FE-simulation

KW - Stack-compression test

KW - Tensile test

UR - http://www.scopus.com/inward/record.url?scp=84949135740&partnerID=8YFLogxK

U2 - 10.1016/j.proeng.2014.10.200

DO - 10.1016/j.proeng.2014.10.200

M3 - Conference article

AN - SCOPUS:84949135740

VL - 81

SP - 1096

EP - 1101

JO - Procedia Engineering

JF - Procedia Engineering

SN - 1877-7058

T2 - 11th International Conference on Technology of Plasticity, ICTP 2014

Y2 - 19 October 2014 through 24 October 2014

ER -