Strength and Deformability of Corroded Steel Plates Estimated by Replicated Specimens
Strength and Deformability of Corroded Steel Plates Estimated by Replicated Specimens
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发表时间：
2008-08
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通讯作者：
Y. Sumi
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作者：
Y. Sumi
腐蚀钢板的强度和变形能力进行了研究，使用人工点蚀和复制的标本处理的计算机辅助设计/计算机辅助制造（CAD-CAM）系统，数控台式铣床生产或复制的腐蚀表面的表面几何形状。对自相似样品制作了周期性的表面凹坑阵列。此外，通过激光位移传感器扫描板来测量腐蚀表面，从而存储表面数据以生成CAM系统的输入。作为全面腐蚀板材的一个典型例子，从一艘老化的油轮底板上取下一个试样，复制其表面几何形状，并进行相应的拉伸试验。抗拉强度的下降幅度较小，而伸长率的下降幅度较大。为了检查腐蚀表面的程度，对具有不同样品面积但具有相同厚度的试样进行测试，其中表面起伏以相同的比例加工。测试结果显示出对表面积的程度的轻微依赖。
Strength and deformability of corroded steel plates are investigated using artificially pitted and replicated specimens processed by a computer-aided design/computer-aided manufacturing (CAD-CAM) system that numerically controls a desktop milling machine to produce or replicate the surface geometry of a corroded surface. Periodic array of surface pits are made for self-similar specimens. Also, corroded surfaces are measured by scanning a plate by a laser displacement sensor, so that the surface data are stored to generate the input for the CAM system. As a typical example of plates with general corrosion, surface geometries of a sample specimen taken from the bottom plate of an aged tanker are reproduced, and the corresponding tensile tests are carried out. The reduction of the tensile strength is slight, while that of the elongation is significant. In order to examine the extent of the corroded surface, test specimens having different sample area but with the same thickness are tested, where the surface undulation is machined in the same scale. The test results show a slight dependence on the extent of the surface area.