A method for detecting transverse cracks between layers of carbon steel/aluminum explosive composite pipe

Abstract

The invention discloses a method for detecting interlamination transverse cracks of a carbon steel / aluminum explosion composite pipe. The method comprises the following steps: exciting to generate and receive guided wave signals at an end surface of the carbon steel / aluminum explosion composite pipe by using Stoneley ultrasonic interface guided waves suitable for analyzing interface problems; then analyzing excitation signals and a plurality of received signal waves, and realizing positioning of interlamination cracks according to a propagation time difference method by using the characteristic that Stoneley waves do not have frequency dispersion; and obtaining an amplitude ratio by using excitation signal amplitude and reflected signal amplitude, changing the excitation frequency for a plurality of times to obtain a plurality of signal amplitude ratio numerical values corresponding to different frequencies, and drawing a relation curve of the signal amplitude ratio and wavelength, wherein the wavelength of the Stoneley waves corresponding to a turning point from a slowly decreasing zone to a quickly decreasing zone of the curve is a quantitative estimated value of the sizes of the interlamination transverse cracks. The detection method disclosed by the invention is reliable in result and simple and feasible to operate, and is suitable for parameter quantitative identification of the interlamination transverse cracks of the carbon steel / aluminum explosion composite pipe.

Description

technical field [0001] The invention belongs to the field of crack detection of mechanical structures, and in particular relates to a detection method for interlayer transverse cracks of a composite pipe structure. Background technique [0002] Explosive composite structures have been used in many industries and fields of the national economy, and there are huge engineering demands, such as chemical industry, petroleum, natural gas, aerospace, electric power, military industry, nuclear industry, shipbuilding, automobile and other industries and fields. For example, in the chemical, petrochemical, and electric power fields, explosive composite pipes and plates are mainly used in distillation, catalytic cracking, desulfurization and hydrogenation, heat exchanger tubes, sewage treatment and other devices and their pipelines to improve corrosion resistance, high temperature resistance, and high pressure resistance. , service life and other properties, a large demand and irreplac...

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Problems solved by technology

However, the traditional acoustic emission detection method uses the stress wave generated at the damage to detect, which is generally a body wave or a surface wave, which is greatly affected by the internal and surface quality of the structure. In addition, it is inconvenient to operate, greatly affected by the environment, and the detection accuracy Bad question

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