Abstract
Mixed-mode I-II crack-based fatigue crack propagation (FCPI-II) usually occurs in engineering structures; however, no theoretical formula or effective compliance test methods have been established for FCPI-II to date. For mixed-mode I-II flawed components, based on the principle of mean-value energy equivalence, we propose a theoretical method to describe the relationship between material elastic parameters, geometrical dimensions, load (or displacement), and energy. Based on the maximum circumferential stress criterion, we propose a uniform compliance model for compact tensile shear (CTS) specimens with horizontal cracks deflecting and propagating (flat-folding propagation) under different loading angles, geometries, and materials. Along with an innovative design of the fixture of CTS specimens used for FCPI-II tests, we develop a new compliance-based testing method for FCPI-II. For the 30Cr2Ni4MoV rotor steel, the FCP rates of mode I, mode II, and mixed-mode I-II cracks were obtained via FCP tests using compact tension, Arcan, and CTS specimens, respectively. The obtained da/dN versus ΔJ curves of the FCP rates are close. The loading angle α and dimensionless initial crack length a0/W demonstrated negligible effects on the FCP rates. Hence, the FCP rates of mode I crack can be used to predict the residual life of structural crack propagation.
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This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFB0702200), the National Natural Science Foundation of China (Grant No. 11872320), and the Policy Guidance Program of Jiangsu Province (Grant No. BZ2020057).
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Qi, S., Xiang, W., Cai, L. et al. Compliance-based testing method for fatigue crack propagation rates of mixed-mode I–II cracks. Sci. China Technol. Sci. 64, 2577–2585 (2021). https://doi.org/10.1007/s11431-020-1872-8
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DOI: https://doi.org/10.1007/s11431-020-1872-8