It is well known that residual stress occurs in many materials and structures, and it will influence the features of the specimen. A new judging method of residual stress based on improved Hilbert-Huang transform (HHT) and image information correlation analysis. Experiment study is carried out on two types of high strength aluminum alloy plate with or without the residual stress, respectively. The local Hilbert spectrum of each intrinsic mode function (IMF) and edge structure similarity coefficients under the two conditions are given. The results show that the changing regulations can be got and the IMF component which is great influenced by the residual stress can also be found out by this method. This method provides a new technique to judge residual stress in this kind of specimen.

Abstract.It is well known that the engineering properties of materials and structural components can be considerably influenced by residual stress. In this paper, a new judging method of residual stress based on improved Hilbert-Huang transform (HHT) is proposed. Two types of high strength aluminum alloy plate with or without the residual stress is analyzed by this technique. The cross correlation coefficients of each intrinsic mode function (IMF) under the two conditions are given. The results show that the changing regulations can be got and the IMF component which is great influenced by the residual stress can also be found out by this method.