A damage detection method for multilayer boards based on Stoneley wave energy transfer characteristics

Abstract

The invention discloses a multi-layer board damage detection method based on a Stoneley wave energy transfer characteristic. According to the method, on the basis that in a multi-layer composite board, energy transfer exists on joints of two interfaces of Stoneley waves, under the condition of different excitation frequencies, distributions of energy magnitudes of the joints of interfaces between plates are different, and when a suitable excitation frequency is selected, independent detection of damage on a specific interface of the multi-layer composite board or simultaneous detection of damage on two interfaces of the multi-layer composite board can be achieved. The detection method is suitable for multi-layer composite board interface damage detection such as damage detection of a three-layer board, it can be guaranteed that fault information of all interfaces is detailed and accurate, the detection capacity is greatly improved, and implementation is convenient, easy and reliable.

Description

technical field [0001] The present disclosure relates to the field of non-destructive testing of mechanical structures, in particular to a method for the independent detection or detection of damage on a specific interface of a multilayer composite board based on the characteristic of Stoneley wave energy transfer between two interfaces in a multilayer composite board. A damage detection method for simultaneous detection of damage on two interfaces. Background technique [0002] With the emergence of new technologies and new industries, the demand for engineering materials with various properties is becoming more and more extensive. A single metal material is either limited by natural resources, or due to insufficient comprehensive performance, its application fields are greatly limited. In this case, the development, production and application of composite materials are increasingly showing their important status. [0003] As a kind of composite materials, layered metal c...

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Problems solved by technology

[0004] Due to the layered structure of layered metal composites, damages such as local through cracks, interlaminar cracks in thick plates, and local delamination often occur during production, processing and engineering use. These damages change the local or overall stiffness and stiffness of the structure. Intensity poses a threat to the safety of users. If the damage cannot be detected in time and remedial measures cannot be taken, as the damage accumulates, it may eventually lead to the sudden failure of the structure part or the whole, which is very likely to cause casualties and property losses.

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