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首页> 外文期刊>Procedia Manufacturing >Finite element analysis of strain gradients in aluminium alloy sheets processed by asymmetric rolling
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Finite element analysis of strain gradients in aluminium alloy sheets processed by asymmetric rolling

机译：非对称轧制铝合金薄板应变梯度的有限元分析

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Gradient microstructures can be achieved due to creating of strain gradient, which can be considered as a mechanism to simultaneous improves the ductility and strength of metallic materials. Asymmetric rolling is one of the methods of severe plastic deformation and this process can be used to fabricate metallic materials with gradient microstructures. Searching the process parameters which provide predetermined strain gradient is very important. This paper presents the distributions of the effective strain through strip thickness of aluminum alloy Al-6.2Mg-0.7Mn processed by a single-pass asymmetric rolling. Effects of thickness reduction per pass (10…60%), rolls speed ratio (1…60%), diameters of the rolls (50…500 mm), contact friction coefficient (0.1…0.4) and initial strip thickness (1…8 mm) were investigated by the rigid-plastic finite-element analysis. The non-linear effect of rolls speed ratio on the strain gradient during asymmetric rolling was found. Extremely high predetermined strain gradient up to e ≈ 3…6 was reached during a single-pass asymmetric rolling. Finite element analysis of the deformation characteristics, presented in this study, can be used for development of the asymmetric rolling process as a method of fabrication of metallic materials with gradient microstructures.
机译：可以通过产生应变梯度来实现梯度微结构，可以将其视为同时提高金属材料的延展性和强度的机制。不对称轧制是严重塑性变形的方法之一，该过程可用于制造具有梯度微结构的金属材料。搜索提供预定应变梯度的工艺参数非常重要。本文介绍了通过单道次不对称轧制加工的铝合金Al-6.2Mg-0.7Mn的带材厚度的有效应变分布。每道次减薄（10…60％），轧辊速度比（1…60％），轧辊直径（50…500 mm），接触摩擦系数（0.1…0.4）和初始带钢厚度（1…8）的影响毫米）进行了刚塑性有限元分析。发现轧辊速度比对非对称轧制过程中应变梯度的非线性影响。在单道次非对称轧制过程中，达到了非常高的预定应变梯度，最高e≈3…6。这项研究中提出的变形特征的有限元分析可用于开发不对称轧制工艺，作为一种具有梯度微结构的金属材料的制造方法。

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