Influence of specimen width on the deformation and fracture behaviour of AA5182 sheets
Influence of specimen width on the deformation and fracture behaviour of AA5182 sheets
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DOI：
10.1016/j.engfracmech.2013.07.007
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发表时间：
2013-09
影响因子：
5.4
通讯作者：
G. Straffelini;V. Fontanari;M. Zadra
中科院分区：
文献类型：
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作者：
G. Straffelini;V. Fontanari;M. Zadra
在这项工作中，试样宽度（在6-15毫米的范围内）的AA 5182铝合金板材的拉伸变形和断裂行为的影响，其特征在于波特文-勒Chatelier效应，进行了研究。实验结果表明，颈缩时的延伸率和断裂时的塑性应变受试样几何形状的影响，特别是在宽度为12.5 mm时达到最大值。实验结果进行了讨论的基础上的有限元建模的拉伸试验。该材料的本构行为的实施以下的方法，考虑到微观结构的不均匀性，通过考虑该材料是由一个矩阵（主要成分）和区域的强度略高和略低。三个微观组织成分的塑性特性表示通过插值的拉伸应力-应变曲线使用Voce的关系。在这种方式中，它示出的试样的几何形状的影响的发生和发展的应力三轴性在塑性变形，从而解释了试样的宽度效应观察到的实验结果。
In this work, the influence of specimen width (in the range 6–15 mm) on the tensile deformation and fracture behaviour of AA5182 aluminium alloy sheets, characterised by the Portevin-Le Chatelier effect, was investigated. The experimental results showed that the elongation at necking and the plastic strain at fracture are influenced by the specimen geometry and, in particular, reached a maximum at a width of 12.5 mm. The experimental results are discussed on the basis of a finite element modelling of the tensile test. The material’s constitutive behaviour was implemented following an approach that accounts for microstructural inhomogeneities by considering the material to be composed of a matrix (main component) and regions of slightly higher and lower strength. The plastic properties of the three microstructural constituents were represented by interpolating the tensile stress–strain curve using Voce’s relationship. In this way, it was shown that the geometry of the specimen influences the onset and development of the stress triaxiality during plastic deformation, thus explaining the specimen width effect observed in the experimental results.