Influence of the post-necking prediction of hardening law on the theoretical forming limit curve of aluminium sheets
| Autor: | Kee-Cheol Park, Quoc Tuan Pham, Bong-Hyun Lee, Young-Suk Kim |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0209 industrial biotechnology
Materials science Mechanical Engineering chemistry.chemical_element 02 engineering and technology Condensed Matter Physics Yield function 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering chemistry Mechanics of Materials Aluminium visual_art Law Aluminium alloy visual_art.visual_art_medium Curve fitting Hardening (metallurgy) General Materials Science Linear combination Civil and Structural Engineering Plane stress Necking |
| Zdroj: | International Journal of Mechanical Sciences. 140:521-536 |
| ISSN: | 0020-7403 |
| DOI: | 10.1016/j.ijmecsci.2018.02.040 |
| Popis: | This study clarified the influence of the post-necking prediction of the hardening law on the theoretical forming limit curve (FLC) of aluminium sheets subjected to punch-stretching tests. A procedure was developed to identify the parameters of a recently developed hardening model (Kim–Tuan hardening model) based on the curve fitting method. Subsequently, this model was used to capture the post-necking behaviours of two aluminium alloy sheets (AL5052-O and AL6016-T4), which were compared with those of various other hardening models, including the Swift model, Voce model, Hockett–Sherby model, Ghosh model, and a linear combination of the Swift and Voce models. These hardening models, with their extrapolations for post-necking prediction, were employed to analytically calculate the FLCs of the tested materials based on the modified maximum force criterion (MMFC). Furthermore, a simple and effective method was found to estimate the level of limited strain in the plane strain mode, namely FLC0. The proposed method was used to clarify the influence of the hardening law and yield function on the level of the computed FLC. The results indicated that the flow curves predicted by the Kim–Tuan hardening model effectively matched the experimental data obtained from uniaxial tensile tests, while their extrapolations provided intermediate predictions of the post-necking behaviour between the flow curves of the Swift and Voce models. In addition, the proposed hardening model improved the accuracy of the computed FLC for the studied materials. |
| Databáze: | OpenAIRE |
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