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Formability analysis of pre-strained AA5754-O sheet metal using Yld96 plasticity theory : role of amount and direction of uni-axial pre-strain
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Dhara, Sisir, Basak, S., Panda, S. K., Hazra, S. K. , Shollock, Barbara A. and Dashwood, R. J. (2016) Formability analysis of pre-strained AA5754-O sheet metal using Yld96 plasticity theory : role of amount and direction of uni-axial pre-strain. Journal of Manufacturing Processes, 24 . pp. 270-282. doi:10.1016/j.jmapro.2016.09.014
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WRAP-formability-analysis-pre-strained-AA5754-O-sheet-metal-Yld96-plasticity-theory-Dashwood-2018.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (2256Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.jmapro.2016.09.014
Abstract
Automotive industries are very much interested in formability of different pre-strained aluminum alloy sheets in the context of multistage stamping to fabricate complex components. In the present work, different uni-axial pre-strains of 6.4% and 12.2% were induced in AA5754-O aluminum alloy both along rolling direction (RD) and transverse direction (TD). The true stress-strain response, limiting dome height (LDH) and strain based forming limit diagram (ε-FLD) of as received and all pre-strained materials were evaluated experimentally. The anisotropy constitutive material model was developed using the Yld96 plasticity theory in-conjunction with the Hollomon isotropic hardening law to predict the yield strength evolution of the pre-strained materials. Also, it was found that the limiting strains in ε-FLD shifted significantly depending on the amount and direction of uni-axial pre-strain. Hence, the limiting strains of the as-received materials were transposed into stress space to estimate the stress based forming limit diagram (σ-FLD) using the anisotropy constitutive material model. Further, the dynamic shifts of ε-FLDs of four different pre-strained materials were predicted by successfully decoupling the σ-FLD of as-received materials within root mean square error of 0.008. Finite element models of both uni-axial pre-straining and subsequent LDH tests were developed, and the forming behavior of the pre-strained materials were predicted implementing the Yld96 plasticity model and estimated σ-FLD. It was found that LDH was significantly influenced by the amount of pre-strain, and the maximum thinning location shifted close to pole in the case of 12.2% pre-strained materials. However, the effect of uni-axial pre-strain direction on both LDH and maximum thinning location in AA5754-O material was very negligible.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TL Motor vehicles. Aeronautics. Astronautics T Technology > TS Manufactures |
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| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Library of Congress Subject Headings (LCSH): | Sheet-metal, Aluminum in automobiles, Finite element method, Steel, High strength -- Mechanical properties, Metals -- Plastic properties | ||||||||
| Journal or Publication Title: | Journal of Manufacturing Processes | ||||||||
| Publisher: | Elsevier | ||||||||
| ISSN: | 1526-6125 | ||||||||
| Official Date: | October 2016 | ||||||||
| Dates: |
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| Volume: | 24 | ||||||||
| Page Range: | pp. 270-282 | ||||||||
| DOI: | 10.1016/j.jmapro.2016.09.014 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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