Compression Behavior of Sheets Metals of Pure Titanium 2 and Ti6Al4V Alloy under High Temperature: Evaluation of the Tension–Compression Asymmetry
Determining the intrinsic indices of sheet metals under compression states at high temperatures is vital to accurately predict the behavior of the material in arm/hot forming processes. Nevertheless, the literature contains little previous experimental data in this regard due to the difficulty of ca...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad de Castilla-La Mancha |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/43276 |
| Acceso en línea: | https://hdl.handle.net/10578/43276 |
| Access Level: | acceso abierto |
| Palabra clave: | Compression anisotropy High temperature Sheet metal compression Tension-compression asymmetry Titanium alloys |
| Sumario: | Determining the intrinsic indices of sheet metals under compression states at high temperatures is vital to accurately predict the behavior of the material in arm/hot forming processes. Nevertheless, the literature contains little previous experimental data in this regard due to the difficulty of carrying out specific test ethodologies in sheet metals. The authors of the present manuscript previously developed an approach to evaluate the in-plane compression behavior under a wide range of test conditions, which was applied here to characterize pure titanium and Ti6Al4V alloy until 750 C. This procedure allowed us to quantify the asymmetric and Nisotropic tension–compression (T-C) response of the materials involved and their evolution with temperature and strain rate. The asymmetry detected at room temperature showed a higher compression response in all cases, mostly reaching differences of around 10%. For the lowest strain rate studied, the typical assumed symmetric T-C behavior was observed from 300 and 450 C onwards, for the rolling and transverse direction, respectively. In addition, stepped compression tests led us to deduce the anisotropy indices, which were different from those found under tension, in contrast to the r-values applied by most authors. Using the experimental results, a factor related to the asymmetry found was proposed to formulate an extended constitutive model. The asymmetry and anisotropy data supplied for compression under warm/hot conditions are the main novelty of this research. |
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