Papers by Keyword: Bonding Structure

Abstract: This paper introduced a nondestructive testing (NDT) method of using guided wave to detect debonding in composite bonding structure, which is based on the model of guided wave energy leakage, and the simulation analysis shown that the diameter of debonding could be quantified by E-x curve. The experiments were carried out on a composite bonding structure, and the results provide that the model established is correct, and that the method of quantifying debonding by E-x curve is effective.

Abstract: The internal defects of bonding structure of 2A50 block wrought aluminum were researched by a sequence thermal images which were obtained in the cooling process by thermal infrared imager with thermal excitation. Each image in the sequence could visually reveal internal defects of the specimen, which shapes projected on the surface. And sequence diagrams could reflect the differences between the temperature gradient of the defects and that of the uniform in the cooling process. Moreover, the more continuous and smooth edges of defects were obtained by rotating track the maximum gradient edge detection method in order to further quantify the size of the defects. The test results showed that infrared thermal imaging technology should be the rapid and effective method to detect internal defects of composite materials.

Abstract: The brazing process of magnesium alloy AZ31 was studied, and the mechanical properties of the weld were examined, and the main factors were analyzed through brazing furnace tests in this work. Only with the protection of self-made brazing flux, a lap joint with the average shear strength of 30MPa could be obtained in an ordinary resistance furnace without inert gas protection, which is much better than that without flux in which the shear strength is lower than 10MPa.