Preliminary Evaluation of Digital Image Correlation for In-situ Observation of Low Temperature Atmospheric-Induced Chloride Stress Corrosion Cracking in Austenitic Stainless Steels
Preliminary Evaluation of Digital Image Correlation for In-situ Observation of Low Temperature Atmospheric-Induced Chloride Stress Corrosion Cracking in Austenitic Stainless Steels
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DOI：
10.1149/1.3407553
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
A. Cook;J. Duff;N. Stevens;S. Lyon;A. Sherry;J. Marrow
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文献类型：
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作者：
A. Cook;J. Duff;N. Stevens;S. Lyon;A. Sherry;J. Marrow
采用数字图像相关技术，在控制温度、相对湿度和氯化物沉积密度的条件下，对304L型不锈钢大气致氯化物应力腐蚀裂纹的生长进行了无损观察。该技术能够检测传统光学显微镜难以识别的裂纹尺寸变化，即盐层和附着腐蚀产物沉积物下的裂纹扩展，以及裂纹张开位移的测量。我们的研究结果还表明，适当的试样设计，结合数字图像相关，将提供一种方法，将大气诱导的短氯应力腐蚀裂纹的生长行为与从常规预裂致密拉伸试样中获得的数据进行比较，作为机械“驱动力”的函数。
Digital image correlation has been used to observe the growth of atmospheric-induced chloride stress corrosion cracking in type 304L stainless steel under controlled conditions of temperature, relative humidity and chloride-deposition density in a nondestructive manner. The technique is capable of detecting changes in crack dimensions that are difficult to discern via conventional optical microscopy, i.e. crack growth beneath salt layers and adherent corrosion product deposits, and measurement of crack opening displacements. Our results also demonstrate that suitable specimen design, combined with digital image correlation, will provide the means of comparing the growth behaviour of short atmospheric-induced chloride stress corrosion cracks with data obtained from conventional pre-cracked compact tension specimens as a function of mechanical “driving force”.