Journal
14TH INTERNATIONAL CONFERENCE ON MATERIAL FORMING ESAFORM, 2011 PROCEEDINGS
Volume 1353, Issue -, Pages 1464-1469Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3589723
Keywords
Ductile damage; Dual phase steel; Mechanical testing; Micro-tomography
Funding
- Agence Nationale de la Recherche [ANR-09-MAPR-0010-(01 and 02).]
- Agence Nationale de la Recherche (ANR) [ANR-09-MAPR-0010] Funding Source: Agence Nationale de la Recherche (ANR)
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This study is part of a broader research project on the prediction of formability limits in bending on radius of the order of the sheet thickness, based on ductile damage. As a first step, ductile damage in DP980 steel sheet was investigated by means of micro-tomography and mechanical testing, including tensile and simple shear tests. The local strain in tension was measured with a digital image correlation device up to rupture, on macroscopic samples of standard dimensions. Moreover, interrupted tensile tests on smaller specimen were also performed, in order to analyze the void distribution by X-ray micro-tomography. The final aim is to perform numerical simulation of the tests, with Gurson-Tvergaard-Needleman model, to take into account the influence of ductile damage on the mechanical behavior. A fair description of the void volume fraction was obtained as well as the stress level, in the case of small-size specimen.
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