Necking of anisotropic micro-films with strain-gradient effects |
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Authors: | Brian Nyvang Legarth |
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Affiliation: | (1) Department of Mechanical Engineering, Solid Mechanics, Technical University of Denmark, 2800 Kgs Lyngby, Denmark |
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Abstract: | Necking of stubby micro-films of aluminum is investigated numerically by considering tension of a specimen with an initial imperfection used to onset localisation. Plastic anisotropy is represented by two different yield criteria and strain-gradient effects are accounted for using the visco-plastic finite strain model. Furthermore, the model is extended to isotropic anisotropic hardening (evolving anisotropy). For isotropic hardening plastic anisotropy affects the predicted overall nominal stress level, while the peak stress remains at an overall logarithmic strain corresponding to the hardening exponent. This holds true for both local and nonlocal materials. Anisotropic hardening delays the point of maximum overall nominal stress. |
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Keywords: | Micro-film Finite strain Nonlocal anisotropic visco-plasticity Anisotropic hardening |
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