| Citation: | LIU Dejun, TIAN Gan, JIN Guofeng, et al. Rotating parabolic-conical corrosion pit model establishment and its application[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(11): 2230-2240. doi: 10.13700/j.bh.1001-5965.2021.0106(in Chinese)
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As one of the common degradation forms of metal structure exposed to the corrosive medium, pitting may cause the local stress concentration and decrease the strength, reliability and safety of the structure of equipment. Thus, an exact pit model is useful for the stress distribution analysis of the metal structure exposed to the corrosive medium. In this instance, by surveying the pattern of typical corrosive pitting, the concept of pit open angle is redefined, and a novel model called rotating parabolic-conial model is developed. Both FEM simulations and tensile experiments are performed to validate the accuracy and efficiency of the proposed model. It is shown that the maximum of the stress concentration caused by the pitting is generally located around the bottom or mouth area of the pit. Compared with the semi-ellipsoid model, the former is more accurate and sensitive on the description of the stress distribution around the bottom shoulder and mouth of a pit.
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