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  Micromechanical characterization of ductile damage in DP steel

Hoefnagels, J. P., Tasan, C. C., Peters, F. J., & Geers, M. G. D. (2013). Micromechanical characterization of ductile damage in DP steel. In Conference Proceedings of the Society for Experimental Mechanics Series (pp. 29-35). doi:10.1007/978-1-4614-4226-4_4.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E3B4-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E3B7-0
Genre: Conference Paper

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 Creators:
Hoefnagels, Johan P.M.1, Author              
Tasan, Cemal Cem2, Author              
Peters, Fayola J.3, Author              
Geers, Marc G. D.4, Author              
Affiliations:
1Eindhoven University of Technology, Dep. of Mech. Eng., P.O. Box 513, 5600MB Eindhoven, The Netherlands, ou_persistent22              
2Adaptive Structural Materials (Experiment), Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863382              
3Department of Mechanical Engineering, Eindhoven University of Technology (TU/e), P.O.Box 513, Eindhoven, The Netherlands, ou_persistent22              
4Department of Mechanical Engineering, Mechanics of Materials, TU Eindhoven, The Netherlands, ou_persistent22              

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Free keywords: Advanced high strength steel; Biaxial tensions; Damage characterization; Damage mechanism; Deformation modes; Different damages; DP-steel; Dual-phase steel; Ductile damage; Ferrite grain size; Gain insight; In-situ SEM; Mechanical points; Micromechanical characterization; Microstructural damage; Microstructural parameters; Microvoid; Plane strain tension; Strain paths; Uniaxial tensions; Viewing area; Volume percentage; Weight minimization, Automotive industry; Deformation; Ductile fracture; Failure (mechanical); Microstructure, Strain
 Abstract: Weight minimization triggered the automotive industry to introduce new advanced high strength steels that show ductile fracture by microvoid evolution under deformation, resulting in unexpected failure without significant necking. Therefore, an extensive study was initiated to gain insight on the formation and development of microstructural damage in dual phase (DP) steel from a mechanical point of view. Different DP (model) microstructures were created that are very similar except for a single microstructural parameter (ferrite grain size or martensite volume percentage). Using our miniaturized Marciniak setup, these DP microstructures were deformed to fracture for three strain paths (uniaxial tension, plane strain tension, and biaxial tension). Exploiting the in-situ SEM visualization capabilities of the miniaturized Marciniak setup, the relevant damage mechanisms were identified and their evolution studied. Finally, a procedure was developed to quantitatively analyze the evolution of these damage mechanisms (post-mortem) by semi-automatically categorizing each damage site over large SEM viewing areas to obtain statistically relevant trends of each damage mechanism with increasing strain, for the strain paths and microstructures. This procedure yielded rich data on the evolutions of the different damage mechanisms as a function of the DP microstructure and deformation mode. Some preliminary observations and hypotheses were formulated. © The Society for Experimental Mechanics. Inc. 2013.

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Language(s): eng - English
 Dates: 2012-09-062013
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1007/978-1-4614-4226-4_4
BibTex Citekey: Hoefnagels201329
ISSN: 21915644
ISBN: 978-146144225-7
 Degree: -

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Title: 2012 Annual Conference on Experimental and Applied Mechanics
Place of Event: Costa Mesa, CA, USA
Start-/End Date: 2013-06-11 - 2013-06-14

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Title: Conference Proceedings of the Society for Experimental Mechanics Series
Source Genre: Proceedings
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Pages: - Volume / Issue: 4 Sequence Number: - Start / End Page: 29 - 35 Identifier: -