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Volume 42 Issue 9
Sep.  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(9): 1936-1943.
LU Longkun, WANG Shengnan, WANG Zhao, et al. Critical CTOA measurement based on quasi-static tensile test[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(9): 1936-1943. doi: 10.13700/j.bh.1001-5965.2015.0557(in Chinese)
Citation: LU Longkun, WANG Shengnan, WANG Zhao, et al. Critical CTOA measurement based on quasi-static tensile test[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(9): 1936-1943. doi: 10.13700/j.bh.1001-5965.2015.0557(in Chinese)
shu

Critical CTOA measurement based on quasi-static tensile test

doi: 10.13700/j.bh.1001-5965.2015.0557
  • 1.

    School of Aeronautics, Northwestern Polytechnical University, Xi'an 71007

  • 2. AVIC Shenyang Aircraft Design Institute, Shenyang 110035, China

  • Received Date: 31 Aug 2015
  • Publish Date: 20 Sep 2016
    Abstract
  • In order to find a more simple and accurate measurement critical crack tip opening angle (CTOAc) method and promote CTOA criterion's application, measurement methods of material CTOAc were studied. The relationship between two different crack tip opening displacement (CTOD) definitions has been derived from CTOA's properties and CTOAc estimation method proposed by Göteborgs Kungliga Segel Sällskap (GKSS). Upon the relationship, a CTOAc measurement method based on quasi-static tensile test was proposed, which is equivalent to but simpler than GKSS estimation method. In order to verify the validity of the proposed method, static tensile tests on 7B04 M(T) specimens were performed, and the 7B04's CTOAc values were estimated by the two methods above. The results show that only 1% discrepancies have been observed between the two CTOAc values. In addition, plane strain core model and plane stress model on specimens were generated in elastic plastic finite element, and the simulation results have coincided with test results.

     

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