Mixed-mode fatigue crack propagation of titanium alloy diffusion bonded joints

被引：0
|
作者：
Liu X. [1 ]
Zhu X. [1 ]
机构：
[1] Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Hangkong Dongli Xuebao/Journal of Aerospace Power | 2019年 / 34卷 / 11期
关键词：
Fatigue crack propagation; Propagation rate; Tensile-shear composite load; Titanium alloy diffusion bonded joints; Ⅰ-Ⅱ mixed-mode crack;
D O I：
10.13224/j.cnki.jasp.2019.11.011
中图分类号：
学科分类号：
摘要：
Compact tensile shear(CTS) specimens of TC4 diffusion bonded joints were designed and processed. The fatigue crack propagation tests of Ⅰ-Ⅱ mixed mode under different loading angles were carried out. The test results showed that when the loading angle was less than 45 degrees, the cracks propagated along the weld line. When the loading angle was more than 45 degrees, the cracks started to propagate along base metal at certain angle. The a-N curves of crack propagation were obtained by electron microscopy in combination with potential method. Based on the test results, the interaction integral method was used to calculate the stress intensity factor, and the Ⅰ-Ⅱ mixed crack propagation process was analyzed based on the strain energy release rate. Finally, considering the weight of crack mode Ⅱ, the composite ratio was introduced. On this basis, a unified model of Ⅰ-Ⅱ mixed crack propagate rate of TC4 diffusion bonded joints under different loading angles and loads was established. © 2019, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：2395 / 2402
页数：7
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