Volume 34 Issue 11
Nov.  2019
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Article Navigation >  Journal of Aerospace Power  > 2019  >  34(11): 2395-2402
LIU Xiaogang, ZHU Xiaolin. Mixed-mode fatigue crack propagation of titanium alloy diffusion bonded joints[J]. Journal of Aerospace Power, 2019, 34(11): 2395-2402. doi: 10.13224/j.cnki.jasp.2019.11.011
Citation: LIU Xiaogang, ZHU Xiaolin. Mixed-mode fatigue crack propagation of titanium alloy diffusion bonded joints[J]. Journal of Aerospace Power, 2019, 34(11): 2395-2402. doi: 10.13224/j.cnki.jasp.2019.11.011
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Mixed-mode fatigue crack propagation of titanium alloy diffusion bonded joints

doi: 10.13224/j.cnki.jasp.2019.11.011

  • 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 210016,China

  • Received Date: 2019-03-24
  • Publish Date: 2019-11-28
    Abstract
  • 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.

     

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