Effect of Semi-elliptical Pit on Stress Concentration of Round Bar

Journal of Chinese Society for Corrosion and protection

2013, Vol. 33

Issue (6): 532-536 DOI:

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Effect of Semi-elliptical Pit on Stress Concentration of Round Bar

LIANG Rui, ZHANG Xinyan, LI Shuxin, JIANG Feng, CHEN Shuaifu

School of PetroChemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China

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Abstract The paper numerically discusses the influence of various aspect ratios (a/2c) of semi-elliptical corrosion pits on stress distribution and stress concentration factor (K_t) in round bars under tension or bending loading. By constructing a series of three-dimensional semi-elliptical pitted models with different pit diameter (2c) between 80 and 1200 μm, and pit depth (a) between 80 and 1100 μm systematically, it can be seen that stress concentration factor is not only affected by pit aspect ratio, but also the type of loading mode. Therefore, the rules of stress concentration factor can be established for a wide range of aspect ratio of corrosion pits. Then the comparison the present results with that of Cerit is conducted. At last, a fitted formulation of the relationship between K_t and a/2c is obtained, by which it is expected to be of convenience to find the value of stress concentration factor in practice of engineering and research.

Key words: corrosion fatigue corrosion pit stress concentration factor stress distribution
maximum stress

Received: 01 March 2013

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	LIANG Rui
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Cite this article:

LIANG Rui,ZHANG Xinyan,LI Shuxin,JIANG Feng,CHEN Shuaifu. Effect of Semi-elliptical Pit on Stress Concentration of Round Bar. Journal of Chinese Society for Corrosion and protection, 2013, 33(6): 532-536.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I6/532

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