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Modeling of Damage and Failure of Dual Phase Steel in Nakajima Test
Key Engineering Materials, 2012For modern high strength steels, instead of metal instability, ductile damage triggered by the formation of microvoids or microcracks resulting from the complex material microstructure, has become the key factor responsible for the final failure in the forming process of such steels.
Jun He Lian +2 more
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Determination of Forming Limit Diagrams for Thin Foil Materials Based on Scaled Nakajima Test
Applied Mechanics and Materials, 2015For a better process understanding of micro deep drawing processes and reliable prediction of component failure in FE simulations, it requires the most accurate knowledge of actual material behaviour. However, it is not sufficient to describe material failure for a multi axial stress state in deep drawing using a mechanical parameter as the elongation ...
Stefan Veenaas +3 more
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Numerical-experimental investigation of load paths in DP800 dual phase steel during Nakajima test
AIP Conference Proceedings, 2018Fuel efficiency requirements demand lightweight construction of vehicle body parts. The usage of advanced high strength steels permits a reduction of sheet thickness while still maintaining the overall strength required for crash safety. However, damage, internal defects (voids, inclusions, micro fractures), microstructural defects (varying grain size ...
Thomas Bergs +4 more
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AIP Conference Proceedings, 2017
Material characteristics such as yield strength and failure strain are affected by the loading speed. Even the start of instability and necking depends not only on the strain hardening coefficient but also on the strain rate sensitivity parameter. Therefore, the strain rate dependence of materials for both plasticity and the failure behavior is taken ...
Nathalie Weiß-Borkowski +5 more
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Material characteristics such as yield strength and failure strain are affected by the loading speed. Even the start of instability and necking depends not only on the strain hardening coefficient but also on the strain rate sensitivity parameter. Therefore, the strain rate dependence of materials for both plasticity and the failure behavior is taken ...
Nathalie Weiß-Borkowski +5 more
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CIRP Annals, 2018
Abstract Since an inhomogeneous punch pressure distribution occurs in the Nakajima test, equibiaxial flow curves have been determined solely in the hydraulic bulge test so far. By using an innovative measurement technique, it is possible to determine both the punch pressure and strains that occur in the Nakajima test. In this paper, a calibration and
Matthias Eder +4 more
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Abstract Since an inhomogeneous punch pressure distribution occurs in the Nakajima test, equibiaxial flow curves have been determined solely in the hydraulic bulge test so far. By using an innovative measurement technique, it is possible to determine both the punch pressure and strains that occur in the Nakajima test. In this paper, a calibration and
Matthias Eder +4 more
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AIP Conference Proceedings, 2018
Determination of forming limit curves (FLC) to describe the multi-axial forming behaviour is possible via either experimental measurements or theoretical calculations. In case of theoretical determination, different models are available and some of them consider the influence of strain rate in the quasi-static and dynamic strain rate regime ...
Nathalie Weiß-Borkowski +7 more
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Determination of forming limit curves (FLC) to describe the multi-axial forming behaviour is possible via either experimental measurements or theoretical calculations. In case of theoretical determination, different models are available and some of them consider the influence of strain rate in the quasi-static and dynamic strain rate regime ...
Nathalie Weiß-Borkowski +7 more
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Finite-element modelling of Nakajima tests in due consideration of anisotropic ductile damage
2010IDDRG - Conference Proceedings - Tools and Technologies for the Processing of ultra high strength ...
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2014
In a typical forming limit curve (FLC), the minimum major strain where the minor value is equal to zero is located at y axes. In many forming processes, failure occurs at this region. Many studies in literature indicates that minimum major strain value is obtained about at y axis. In this study, the minimum major strain value is not determined on the y
Dilmeç, Murat +2 more
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In a typical forming limit curve (FLC), the minimum major strain where the minor value is equal to zero is located at y axes. In many forming processes, failure occurs at this region. Many studies in literature indicates that minimum major strain value is obtained about at y axis. In this study, the minimum major strain value is not determined on the y
Dilmeç, Murat +2 more
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A Study on the influence of Friction Coefficients to Sheet Metal Forming in Nakajima Test in Abaqus
2014Berardo, José Manuel Vicente +1 more
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