A model of void coalescence in columns

A model of void coalescence in columns
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柱中空隙合并模型

DOI:
10.1016/j.jmps.2022.105134
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发表时间:
2023
影响因子:
5.3
通讯作者:
Leblond, J.-B.
Leblond, J.-B.
中科院分区:
工程技术2区
文献类型:
--
作者:
Torki, M.E.;Medrano, F.A.;Benzerga, A.A.;Leblond, J.-B.

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柱状孔洞聚结(或项链状孔洞聚结)是一种计算证实和物理观察到的金属合金和聚合物中孔洞连接机制,在文献中很少受到关注。在这里,对这种现象的解析处理是从极限分析和均匀化理论的第一原理出发的。研究了在轴对称载荷作用下,嵌入有限高圆柱空隙的圆柱单元胞体。两种类型的试验速度场用于寻找屈服准则的上界,该准则与柱中特定的聚并机制相对应。对于每种类型,获得了总体屈服准则的精确表达式,尽管在使用连续字段时是隐式形式。在与其他允许孔隙生长和层内聚并的屈服模式进行比较后,获得了实际有效屈服域,从而确定应力状态和柱内孔隙聚并盛行的微观结构状态。根据基于有限元的极限分析对预测结果进行了评估。
Void coalescence in columns (ornecklacecoalescence) is a computationally confirmed and physically observed mechanism of void link-up in metal alloys and polymers that has received little attention in the literature. Here, analytical treatment of the phenomenon proceeds from first principles of limit analysis and homogenization theories. A cylindrical unit cell embedding a cylindrical void of finite height is considered under axially symmetric loading. Two types of trial velocity fields are used in seeking an upper bound to the yield criterion corresponding to the particular regime of coalescence in columns. For each type, exact expressions of the overall yield criterion are obtained, albeit in implicit form when using continuous fields. Upon comparison with other modes of yielding allowing for void growth and coalescence in layers, an actual effective yield domain is obtained so as to ascertain regimes of stress state and microstructural states where void coalescence in columns prevails. The predictions are also assessed against finite element based limit analysis.
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