| Citation: | ZUO Randong, HE Xiaofan, LI Yuhaiet al. Parameter determination method of relative small crack growth rate formula in durability analysis[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(12): 2594-2601. doi: 10.13700/j.bh.1001-5965.2020.0492(in Chinese)
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Relative small crack growth rate formula of structural details is the key to durability analysis using probabilistic fracture mechanics method. In order to determine the applicable range and parameters of the formula, it is necessary to carry out group fatigue tests under multiple stress levels, which is too complex. To solve this problem, in this paper, first, the stress intensity factor correction coefficient is expanded to a polynomial, and the relative small crack growth rate formula for durability analysis is obtained based on the crack growth rate formula of material stable crack growth section. Then, various crack growth of the central hole plate subjected to far-field uniform tensile load is analyzed based on the approximate solution of stress intensity factor and FRANC3D software, and a method is obtained to determine the relative small crack size range and the corresponding crack growth parameters. Finally, the correctness of the method is verified by durability tests of three specimens under constant amplitude alternating stress.
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