Papers by Keyword: Digital Image Correlation Technique

Abstract: Water gate is one of important equipments for arbitrating water supply and maintaining safety of dam. Water gate is made of high tensile strength of steel plate, this kind of steel plate used as constructional material of water gate is weighed for the economical consideration. Steel plate must be cut, welded and rivet to manufacture water gate. Thus, there are some crevices, induced by the defects of material, bad construction, seismic excitation and errors of size, on water gate. This phenomena causes stress concentration, induced high crack increase rate, affect the safety and usage of water gate. In this research, digital image correlation method is developed to measure the mechanics behavior of single steel plate and bi-steel plate with crevices under tension force according to the characteristics of water gate filed test. The test and analysis results of laboratory test reveal that this digital image correlation method can easily indentify the corrosion point on the steel plate. Otherwise, the crack variation of crack tip of steel plate-single steel plate and bi-material steel plate under loadings can be easily identified by the laboratory test.

Abstract: The current work focuses on the particular case of dissimilar 6082 Al alloy/pure copper butt-friction stirred joints. It takes advantage of voluntarily non optimized welding conditions in order to test the potential of an original approach of identification of the welding defects by means of a single tensile test. The sequence and mechanism of the fracture events arise from their localization on the fracture surfaces thanks to strain maps obtained by digital image correlation. This technique of flaws identification is proved to be particularly efficient at least with the present highly damaged welds.