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Experimental and numerical prediction of the static and dynamic forming properties of Ti6Al4V

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Abstract
The strain rate dependence of the plastic yield and failure properties displayed by most metals affects energies, forces and forming limits involved in high speed forming processes. In this contribution a technique is presented to assess the influence of the strain rate on the forming properties of Ti6Al4V sheet. In a first step, static and dynamic tensile experiments are carried out using a classical tensile test device and a split Hopkinson tensile bar facility respectively. Next to uniaxial tensile, also purpose-developed plain strain and shear stress samples are tested. The experimental results clearly show that the mechanical behaviour of Ti6Al4V is strain rate dependent. Indeed, with increasing strain rate, plastic stress levels increase, however, this occurs at the expense of the deformation capacity. Subsequently, to allow simulation of forming processes, Johnson-Cook, Swift and Voce material model parameters are determined. Finally, the influence of the strain rate on the forming limits is assessed using the uni-axial tensile test results. Prediction of the initiation of necking in the Ti6Al4V sheets subjected to multi-axial strain states is based on the Marciniak-Kuczynski model. The thus obtained forming limit diagrams (FLDs) show a non-negligible effect of the strain rate. The reduced ductility at higher strain rates is reflected into an unfavourable downward shift of the FLD. Compared with the experimental data, the static FLD is clearly conservative.
Keywords
Ti6Al4V, Forming Limit Diagram, Dynamic Material behaviour

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MLA
Verleysen, Patricia, and Jesus Galan-Lopez. “Experimental and Numerical Prediction of the Static and Dynamic Forming Properties of Ti6Al4V.” International Conference on High Speed Forming 2016. 2016. Print.
APA
Verleysen, P., & Galan-Lopez, J. (2016). Experimental and numerical prediction of the static and dynamic forming properties of Ti6Al4V. International conference on High Speed Forming 2016. Presented at the International conference on High Speed Forming 2016.
Chicago author-date
Verleysen, Patricia, and Jesus Galan-Lopez. 2016. “Experimental and Numerical Prediction of the Static and Dynamic Forming Properties of Ti6Al4V.” In International Conference on High Speed Forming 2016.
Chicago author-date (all authors)
Verleysen, Patricia, and Jesus Galan-Lopez. 2016. “Experimental and Numerical Prediction of the Static and Dynamic Forming Properties of Ti6Al4V.” In International Conference on High Speed Forming 2016.
Vancouver
1.
Verleysen P, Galan-Lopez J. Experimental and numerical prediction of the static and dynamic forming properties of Ti6Al4V. International conference on High Speed Forming 2016. 2016.
IEEE
[1]
P. Verleysen and J. Galan-Lopez, “Experimental and numerical prediction of the static and dynamic forming properties of Ti6Al4V,” in International conference on High Speed Forming 2016, Dortmund, 2016.
@inproceedings{8094251,
  abstract     = {The strain rate dependence of the plastic yield and failure properties displayed by most metals affects energies, forces and forming limits involved in high speed forming processes. In this contribution a technique is presented to assess the influence of the strain rate on the forming properties of Ti6Al4V sheet. In a first step, static and dynamic tensile experiments are carried out using a classical tensile test device and a split Hopkinson tensile bar facility respectively. Next to uniaxial tensile, also purpose-developed plain strain and shear stress samples are tested. The experimental results clearly show that the mechanical behaviour of Ti6Al4V is strain rate dependent. Indeed, with increasing strain rate, plastic stress levels increase, however, this occurs at the expense of the deformation capacity. Subsequently, to allow simulation of forming processes, Johnson-Cook, Swift and Voce material model parameters are determined. Finally, the influence of the strain rate on the forming limits is assessed using the uni-axial tensile test results. Prediction of the initiation of necking in the Ti6Al4V sheets subjected to multi-axial strain states is based on the Marciniak-Kuczynski model. The thus obtained forming limit diagrams (FLDs) show a non-negligible effect of the strain rate. The reduced ductility at higher strain rates is reflected into an unfavourable downward shift of the FLD. Compared with the experimental data, the static FLD is clearly conservative.},
  author       = {Verleysen, Patricia and Galan-Lopez, Jesus},
  booktitle    = {International conference on High Speed Forming 2016},
  keywords     = {Ti6Al4V,Forming Limit Diagram,Dynamic Material behaviour},
  language     = {eng},
  location     = {Dortmund},
  title        = {Experimental and numerical prediction of the static and dynamic forming properties of Ti6Al4V},
  year         = {2016},
}