Effect of interface layer consisting of nanosprings on stress field near interface edge
Effect of interface layer consisting of nanosprings on stress field near interface edge
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DOI：
10.1016/j.engfracmech.2009.02.002
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发表时间：
2009-06
影响因子：
5.4
通讯作者：
T. Sumigawa;Taisuke Sueda;Yuya Futamura;Motofumi Suzuki;T. Kitamura
中科院分区：
文献类型：
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作者：
T. Sumigawa;Taisuke Sueda;Yuya Futamura;Motofumi Suzuki;T. Kitamura
本研究的目的是探讨由离散排列的纳米尺寸元素组成的界面层对应力增强场的影响。一种材料，其中由Ta 2 O 5螺旋纳米元件（纳米弹簧）的界面层插入不同的组件之间的准备和两种类型的裂纹萌生实验，其中具有根本不同的应力条件，进行。有限元分析表明，有界面层和无界面层的构件中的应力场是完全不同的，实验表明，断裂力学概念不能应用于有界面层的不同界面边缘处的裂纹萌生。裂纹萌生时的应力分布表明，裂纹萌生受纳米弹簧在边缘处的表观应力σ′控制。这意味着界面层消除了界面边缘的应力奇异场。裂纹萌生判据为σc′=78.5±4.0MPa（εc′=5.1±0.2×10-2）。
The purpose of this study is to investigate the effect of an interface layer consisting of discretely arrayed nano-sized elements on stress intensified fields. A material where an interface layer consisting of Ta2O5helical nanoelements (nanosprings) is inserted between dissimilar components is prepared and two types of crack initiation experiments, which possess radically different stress conditions, are carried out. The finite element analyses indicate that the stress fields in the components with and without the interface layer are completely different, and it is experimentally clarified that the fracture mechanics concept cannot be applied to the crack initiation at the dissimilar interface edge with the interface layer. The stress distributions at the crack initiation reveal that the crack initiation is governed by the apparent stress of the nanospring, σ′, at the edge. This signifies that the interface layer eliminates the stress singular field at the interface edge. The criterion of the crack initiation is evaluated as σc′=78.5±4.0MPa(εc′=5.1±0.2×10-2).