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The research for intensity of corrosive fatigue under changing tensile force according to method of electric chemistry of cable structure in ocean

海洋电缆结构电化学方法在拉力变化下的腐蚀疲劳强度研究

基本信息

批准号：
03650388
负责人：
KOTOGUCHI Hisao
金额：
$ 0.96万
依托单位：
Daido Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650388/
关键词：
fatigue corrosion electric chemistry cable in ocean speed of crack growth destructive dynamics 海洋ケ-ブル

项目摘要

Experimental results about corrosion speed and S-N curve. It'll be possible that we can request the corrosion speed of cable steel under moisture environment through the method of electric chemistry. And it shows the difference clearly. Curving the S-N of cable steel through the effect of corrosive fatigue experiment in 25ﾟC、3%NaCL solution and the fatigue experiment in air, In the case of corrosion, if we make the corrosion speed 15 times faster than the natural corrosion, it will be broken after 2000 million times. In the meantime, its persistence shows 12 percent of which is in air, and 95 percent of the section will be broken.Experiment results about crack growth. The relationship of da/dN-DELTAK about fatigue crack growth will be changed because of different environment. We can also measure the length of crack in corrosion solution by means of current potential method. In order to interpret the phenomenon about the crack opening and closing which is happened in the case of corrosive fatigue, we have been able to make kinds of experiments. And we can show the Kop point clear under experiment so as to put the data in order through the effective stress intensity factor. Using the scanning microscope to observe the broken plane and the length of crack growth and fatigue destruction, we can observe the first crack glinding plane and the striation of the second passage and the wave front of dimple of third passage.

腐蚀速度和S-N曲线的实验结果。通过电化学法测量电缆钢材在潮湿环境中的腐蚀速度是可能的。它清楚地显示了不同之处。通过在25ﾟC、3%NaC l溶液中的腐蚀疲劳试验和空气中的疲劳试验，对电缆钢的S-N进行了弯曲试验，在腐蚀的情况下，如果使腐蚀速度比自然腐蚀快15倍，2000万次后就会断裂。同时，它的持续时间表明，12%的裂纹在空气中，95%的截面将破裂。关于裂纹扩展的实验结果。疲劳裂纹扩展的da/dN-DELTAK关系会因环境的不同而发生变化。我们还可以用电流电位法测量腐蚀溶液中的裂纹长度。为了解释腐蚀疲劳情况下的裂纹张开和闭合现象，我们进行了各种实验。通过有效应力强度因子，可以在实验中清晰地显示出Kop点，从而对数据进行整理。用扫描显微镜观察裂纹扩展和疲劳破坏的断裂面和长度，可以观察到第一裂纹的闪光面、第二道的条纹和第三道韧窝的波前。