Forming limit prediction using a self-consistent crystal plasticity framework: a case study for body-centered cubic materials
| Autor: | Mark A. Iadicola, Minh-Son Pham, Adam A. Creuziger, Youngung Jeong, Timothy J. Foecke |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology Cubic crystal system 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Measure (mathematics) Article Computer Science Applications Stress (mechanics) Crystallography Forming limit diagram Mechanics of Materials Modeling and Simulation 0103 physical sciences General Materials Science Statistical physics Limit (mathematics) Texture (crystalline) 0210 nano-technology Anisotropy Plane stress |
| Zdroj: | Model Simul Mat Sci Eng |
| Popis: | A rate-dependent self-consistent crystal plasticity model was incorporated with the Marciniak–Kuczyński model in order to study the effects of anisotropy on the forming limits of BCC materials. The computational speed of the model was improved by a factor of 24 when running the simulations for several strain paths in parallel. This speed-up enabled a comprehensive investigation of the forming limits of various BCC textures, such as γ, σ, α, η and ϵ fibers and a uniform (random) texture. These simulations demonstrate that the crystallographic texture has significant (both positive and negative) effects on the resulting forming limit diagrams. For example, the γ fiber texture, which is often sought through thermo-mechanical processing due to a high r-value, had the highest forming limit in the balanced biaxial strain path but the lowest forming limit under the plane strain path among the textures under consideration. A systematic investigation based on the results produced by the current model, referred to as ‘VPSC-FLD’, suggests that the r-value does not serve as a good measure of forming limit strain. However, model predictions show a degree of correlation between the r-value and the forming limit stress. |
| Databáze: | OpenAIRE |
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