Evaluation of Fatigue Crack Propagation Behavior of Pressurized Sintered Ag Nanoparticles and Its Application to Thermal Fatigue Life Prediction of Sintered Joint
Evaluation of Fatigue Crack Propagation Behavior of Pressurized Sintered Ag Nanoparticles and Its Application to Thermal Fatigue Life Prediction of Sintered Joint
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DOI：
10.2320/matertrans.mh201802
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发表时间：
2019-01-01
影响因子：
1.2
通讯作者：
Aiko, Yuki
中科院分区：
文献类型：
--
作者：
Sato, Takahiko;Kariya, Yoshiharu;Aiko, Yuki
研究了压力烧结银纳米粒子的疲劳裂纹扩展速率，并提出了利用有限元计算的应变能密度预测疲劳裂纹扩展的方法。在环境温度下，疲劳裂纹扩展速率低于常压烧结银纳米粒子。高温时，在主裂纹之前出现多个小裂纹，且这些小裂纹相互连通，主裂纹的扩展速率增大，使得高温区的疲劳裂纹扩展特性与无压烧结纳米银颗粒接近。由于非弹性应变能密度与其采集区域的长度成反比，因此利用关系式的比例常数可以预测不依赖于区域大小的疲劳裂纹扩展。由推导的疲劳裂纹扩展定律预测的烧结接头结构的热疲劳裂纹扩展行为与实验行为基本一致。
Fatigue crack propagation rate of pressure-sintered Ag nanoparticles was investigated and prediction method of fatigue crack propagation using strain energy density computed by FEM was proposed. The fatigue crack propagation rate was lower than that of pressureless-sintered Ag nanoparticles around ambient temperature. At high temperature, multiple small cracks occurred ahead of a main crack and they were connected with one another and the propagation rate of the main crack increased, so that properties of fatigue crack propagation in the high temperature region were close to those of pressureless-sintered Ag nanoparticles.As the inelastic strain energy density and the length of its acquisition area were inversely proportional, the prediction of fatigue crack propagation that do not depend on the size of the area was possible by the use of the proportional constant of the relationship. The behavior of thermal fatigue crack propagation of sintered joint structure that was predicted by the derived fatigue crack propagation law was mostly in agreement with experimental behavior.