Evaluation of interfacial fracture strength in micro-components with different free-edge shape
Evaluation of interfacial fracture strength in micro-components with different free-edge shape
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DOI：
10.1299/mej.16-00108
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发表时间：
2016-08
影响因子：
0.5
通讯作者：
Y. Takahashi;K. Aihara;Itaru Ashida;Kimitaka Higuchi;Yuta Yamamoto;S. Arai;S. Muto;N. Tanaka
中科院分区：
文献类型：
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作者：
Y. Takahashi;K. Aihara;Itaru Ashida;Kimitaka Higuchi;Yuta Yamamoto;S. Arai;S. Muto;N. Tanaka
采用不同自由边形状的试样，研究了由硅（Si）和铜（Cu）组成的微尺度双材料悬臂梁自由边的抗界面断裂形核强度。A型（90°/90°边缘）试样的断裂强度（由垂直于界面的近边缘应力（σ σ）表示）明显分散。另一方面，由应力强度因子表示的B型（135°/135°边缘）试样的断裂强度显示出非常好的一致性。这表明，在自由边缘处引入尖锐的楔形体是用于评估界面所特有的断裂强度的有效措施。这些特性也被发现是不变的塑性的Cu组份。然后将B型试样的优点应用于评价气体环境对断裂强度的影响。在含氢（H2）气体中，强度值没有明显降低，表明Si/Cu界面具有较好的抗氢脆性能。
The strength against interfacial fracture nucleation from the free-edge of micro-scale bimaterial cantilevers consisting of silicon (Si) and copper (Cu) components is evaluated by using specimens with different free-edge shape. The fracture strength of Type A (90°/90° edge) specimens represented by the near-edge stress normal to the interface () is significantly scattered. On the other hand, the fracture strength of Type B (135°/135° edge) specimens represented by the stress intensity factor of shows very good agreement. This indicates that the introduction of a sharp wedge at the free-edge is an effective measure for the evaluation of fracture strength that is unique to the interface. Such characteristics are also found to be unaltered by the plasticity of Cu component. The advantage of Type B specimen is then applied to the evaluation of the effect of gaseous environment on the fracture strength. There is no eminent reduction of strength value in hydrogen (H2)-containing gas, indicating that Si/Cu interface is relatively resistant against hydrogen embrittlement.