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Experimental investigation and crystal plasticity-based prediction of AA1050 sheet formability

Hajian, M ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1177/0954405415597843
  3. Publisher: SAGE Publications Ltd , 2017
  4. Abstract:
  5. This article presents a crystal plasticity methodology to evaluate the AA1050 sheet formability. In order to determine the orientation distribution of the crystals, initial texture of the material is measured through X-ray diffraction technique. Also, the stress-strain behavior of the material is determined by performing tensile test. In order to simulate the path-dependent crystal plasticity behavior of body-centered cubic crystal structures, a UMAT subroutine that employs the rate-dependent crystal plasticity model along with the power law hardening was developed previously by the authors and linked to the finite element software ABAQUS. This subroutine was further developed to simulate face-centered cubic crystal structures. The second-order derivative of sheet thickness variations with respect to time is considered as the instability factor, and forming limit diagram of the material is predicted. In order to assess the validity of formability prediction results for face-centered cubic materials, forming limit diagram of AA1050 sheet is also experimentally extracted by conducting hemi-spherical punch test. It is observed that the predicted forming limit diagram is in agreement with the experimental results. Finally, the prediction accuracy in different regions of forming limit diagram is discussed and some suggestions for further improving the accuracy are made. © 2017 Institution of Mechanical Engineers
  6. Keywords:
  7. AA1050 sheet ; Formability prediction ; Forming limit diagram ; Hemi-spherical punch test ; X-ray diffraction ; ABAQUS ; Crystal orientation ; Crystal structure ; Finite element method ; Forecasting ; Plasticity ; Subroutines ; Tensile testing ; X ray diffraction ; Body-centered cubic crystals ; Experimental investigations ; Face centered cubic crystal structure ; Forming limit diagrams ; Punch tests ; Texture measurement ; X-ray diffraction techniques ; Plasticity testing
  8. Source: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture ; Volume 231, Issue 8 , 2017 , Pages 1341-1349 ; 09544054 (ISSN)
  9. URL: http://journals.sagepub.com/doi/10.1177/0954405415597843