Monitoring Crack Growth by Means of Electrical Potential in Surface Coating of Aluminium Alloy Specimen
Electrical potential method (EPM) has been widely used to monitor crack growth for small conductive specimens in lab. Once a crack-like defect occurs, EPM can be applied to monitor local crack size changes. Here, the surface of aluminium alloy structure specimen is coated with a thin layer (the underlayer, which is covered on all surface of the specimen, is made of nonconductive material; moreover, on the interested location the superstratum is made of conductive material) and the crack length is measured through the changes in the electrical surface coating, as the crack grows both in the base material and the thin layer. In contrast to the traditional DC electric potential technique where the position of the probes for measuring the crack length is very important for an accurate measurement of the crack length, the new technique is provided a more sensitive selection to monitor the crack growth in the interested location for large/complex structures. And by the dimensionless method in this paper, not only smooth testing curve is obtained but also the data processing precision is effectively improved.
Electrical potential method Aluminum alloy specimens Surface coating Crack growth monitoring
Hongpeng Li Yuting He Ronghong Cui Chaohua Fan
Engineering College, Air Force Engineering University, Xian 710038, China
国际会议
南京
英文
1245-1249
2007-10-16（万方平台首次上网日期，不代表论文的发表时间）