Experimental study on the formability of AA6016 sheets pre-strained by rolling
| Autor: | Térence Coudert, Odd-Geir Lademo, Aase Gavina Roberg Reyes, Dmitry Vysochinskiy, Odd Sture Hopperstad |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Digital image correlation
Materials science Tension (physics) Stress space 02 engineering and technology Plasticity 021001 nanoscience & nanotechnology 020303 mechanical engineering & transports Forming limit diagram 0203 mechanical engineering Formability General Materials Science Composite material 0210 nano-technology Anisotropy Plane stress |
| Zdroj: | International Journal of Material Forming |
| Popis: | The effects of prestrain by rolling on the formability of AA6016 sheets in the biaxial stretching region are studied in this paper. An experimental program including formability experiments has been carried out for as-received and prestrained sheets. Forming limit strains are determined by the digital image correlation technique and then mapped into stress space using an anisotropic plasticity model in order to assess the pathindependence of forming limit stresses. Different diagrams for description of formability such as the traditional strain-based forming limit diagram (FLD), the forming limit stress diagram (FLSD) and various equivalent plastic strain based (EPS-based) diagrams are applied in order to study the effect of prestrain. It is shown that prestrain by rolling has the same effect on the forming limit strains as prestrain by plane strain tension. Furthermore, the forming limits of the virgin material nearly coincide with the forming limits of the prestrained material in the FLSD and EPS-based diagrams, serving as a conservative estimate for the prestrained material. Due to the roping phenomenon, the material displays significant anisotropy in forming limit strains. At the same time, the presence of roping does not affect the path-independence of the forming limits in the FLSD and EPS-based diagrams. © Springer-Verlag France SAS 2017. This is the authors' accepted and peer-reviewed manuscript, locked until 22 June 2018 due to copyright restrictions.The final authenticated version is available online at: http://dx.doi.org/10.1007/s12289-017-1363-6 |
| Databáze: | OpenAIRE |
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