Influence of material models on theoretical forming limit diagram prediction for Ti–6Al–4V alloy under warm condition
| Autor: | Nitin Kotkunde, Sashank Srinivasan, Amit Gupta, Swadesh Kumar Singh, Geetha Krishna |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science business.industry Constitutive equation Metals and Alloys Thermodynamics Forming processes 02 engineering and technology Structural engineering 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics 01 natural sciences Power law Forming limit diagram visual_art 0103 physical sciences Materials Chemistry visual_art.visual_art_medium Hardening (metallurgy) 0210 nano-technology Sheet metal Anisotropy business Necking |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 26:736-746 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(16)64140-7 |
| Popis: | Forming limit diagram (FLD) is an important performance index to describe the maximum limit of principal strains that can be sustained by sheet metals till to the onset of localized necking. It offers a convenient and useful tool to predict the forming limit in the sheet metal forming processes. In the present study, FLD has been determined experimentally for Ti–6Al–4V alloy at 400 °C by conducting a Nakazima test with specimens of different widths. Additionally, for theoretical FLD prediction, various anisotropic yield criteria (Barlat 1989, Barlat 1996, Hill 1993) and different hardening models viz., Hollomon power law (HPL), Johnson–Cook (JC), modified Zerilli–Armstrong (m-ZA), modified Arrhenius (m-Arr) models have been developed. Theoretical FLDs have been determined using Marciniak and Kuczynski (M–K) theory incorporating the developed yield criteria and constitutive models. It has been observed that the effect of yield model is more pronounced than the effect of constitutive model for theoretical FLDs prediction. However, the value of thickness imperfection factor ( f 0 ) is solely dependent on hardening model. Hill (1993) yield criterion is best suited for FLD prediction in the right hand side region. Moreover, Barlat (1989) yield criterion is best suited for FLD prediction in left hand side region. Therefore, the proposed hybrid FLD in combination with Barlat (1989) and Hill (1993) yield models with m-Arr hardening model is in the best agreement with experimental FLD. |
| Databáze: | OpenAIRE |
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