半椭球蚀坑对圆棒应力集中的影响

中国腐蚀与防护学报

2013, Vol. 33

Issue (6): 532-536

研究论文

本期目录 | 过刊浏览

半椭球蚀坑对圆棒应力集中的影响

梁瑞张新燕李淑欣姜峰陈帅甫

兰州理工大学石油化工学院兰州 730050

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

全文: PDF(2016 KB)

摘要: 利用数值分析方法讨论了在轴向拉伸或弯曲载荷作用下，圆棒试件表面半椭球形蚀坑深径比 (a/2c) 对应力分布及应力集中系数 (K_t) 的影响。取蚀坑直径 (2c) 范围80~1200 μm，蚀坑深度 (a) 范围80~1100 μm，建立一系列具有表面半椭球蚀坑的三维圆棒模型，通过ANSYS模拟分析，发现应力集中系数受到蚀坑深径比和加载形式的影响。通过分析曲线变化趋势，得到K_t随a/2c的变化规律，并对照文献数据进行了验证分析，最后通过拟合得到了K_t与a/2c的数值计算公式。

关键词 ：腐蚀疲劳, 腐蚀坑, 应力集中系数, 应力分布, 最大应力

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

收稿日期: 2013-03-01

ZTFLH:

O343.4

基金资助:国家自然科学基金项目 (51275225)，国家质检公益基金项目 (201210026)，甘肃省财政厅高校基本科研业务费和兰州理工大学博士基金项目 (SB05200801) 资助

通讯作者: 梁瑞，E-mail：13993116222@163.com

作者简介: 梁瑞，男，1968年生，教授，硕士，研究方向为压力容器及压力管道的结构完整性及安全评定

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引用本文:

梁瑞, 张新燕, 李淑欣, 姜峰, 陈帅甫. 半椭球蚀坑对圆棒应力集中的影响[J]. 中国腐蚀与防护学报, 2013, 33(6): 532-536.
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.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2013/V33/I6/532

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