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Effects of Stress Concentration Factors on Corrosion Fatigue Strength of a Steel Plate for Ship Structures

机译：应力集中因素对船用钢板腐蚀疲劳强度的影响

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This paper presents the results of corrosion fatigue tests on notched specimens of a steel plate for ship structures. Stress concentration factors, Kt, are 1.2, 2.0, 2.93 and 3.77. The corrosion fatigue tests were carried out at a cycling rate of 0.17Hz under a natural corrosion condition in synthetic seawater. A corrosion fatigue strength was estimated from the S-N curves based on crack initiation life. The S-N curves were expressed by an equation LogN=A+BΔS with experimental constants A and B. The corrosion fatigue strength decreased with the increase in the stress concentration factor. The S-N curves can be expressed as straight lines for a stress range of more than 100 MPa. The fatigue lives have a tendency to increase for a stress range of less than 100 MPa. In the lower stress range, a crack initiation life should be examined in connection with corrosion wastage and corrosion pits. For Kt ≤ 3.1 in air or in seawater, the linear relations were observed between the Kt and the constant A or B. Therefore, a slope of the S-N curve can be estimated for arbitrary Kt values. A fatigue limit in air also can be estimated from the linear relationships for Kt < 3.1. It gives a constant value for Kt > 3.1. In the equivalent stress in consideration of the maximum stress at the notch root, the fatigue crack initiation life can be collected onto each different one line in air and in seawater, respectively.
机译：本文介绍了用于船用结构钢板的缺口试样的腐蚀疲劳测试结果。应力集中系数Kt为1.2、2.0、2.93和3.77。腐蚀疲劳试验是在合成海水中在自然腐蚀条件下以0.17Hz的循环速率进行的。基于裂纹萌生寿命，从S-N曲线估计腐蚀疲劳强度。 S-N曲线由具有实验常数A和B的方程LogN = A +BΔS表示。腐蚀疲劳强度随应力集中系数的增加而降低。 S-N曲线可以表示为应力范围大于100 MPa的直线。对于小于100 MPa的应力范围，疲劳寿命有增加的趋势。在较低的应力范围内，应结合腐蚀损耗和腐蚀点来检查裂纹萌生寿命。对于空气或海水中的Kt≤3.1，观察到Kt与常数A或B之间存在线性关系。因此，可以针对任意Kt值估算S-N曲线的斜率。空气的疲劳极限也可以根据Kt <3.1的线性关系来估算。当Kt> 3.1时，它给出一个恒定值。考虑到切口根部的最大应力，在等效应力下，疲劳裂纹萌生寿命可以分别收集到空气和海水中的每条不同线上。

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