Acoustic detection method of structural mechanical parameters of multilayer composite material

Abstract

The invention relates to an acoustic detection method of structural mechanical parameters of a multilayer composite material. The method comprises respectively establishing relationships between the elastic and shear moduli, and the geometrical dimension, the mass and the resonant frequency of a multilayer composite material structure by empirical formulas, then carrying out stimulation at one end, acquiring time domain vibration signals at the other end so that ff and ft are obtained, utilizing ff, ft the geometrical dimension and mass of the multilayer composite material structure as empirical formula inputs and carrying out calculation to obtain a dynamic Young modulus E and a dynamic shear modulus G. The method solves the problem that the classical impulse excitation-based mechanical parameter detection standard method needs preparation of a rectangular cross-section sample, overcomes the damage of the mechanical structure in the traditional mechanical parameter detection process, simplifies the detection processes, greatly shortens the detection time and is suitable for practical application conditions of the multi-layer composite material structure. Through recognition of bending resonance frequency and shear resonance frequency of the multilayer composite material plate, high efficiency, accurate and non-destructive detection of dynamic mechanical parameters of the multilayer composite material plate is realized.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of mechanical structures, and relates to an acoustic testing method for mechanical parameters of a multilayer composite material structure. Background technique [0002] At present, with the rapid development of the country's manufacturing industry, the society's demand for mechanical equipment is expanding day by day. High-performance composite materials are widely used in various manufacturing fields. The industry has higher and higher requirements for material performance. Since the characteristics of the material itself may change with the application environment and working conditions, this will lead to the stability of the material and the entire mechanical equipment. And the reliability is reduced, which leads to safety accidents from time to time. Therefore, it is particularly important to carry out digital simulation of the system in advance to realize the evaluation of t...

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Problems solved by technology

However, previous studies were limited to traditional engineering materials, and the rapid identification of mechanical parameters of multilayer composite plate structures under actual operating conditions has not been reported due to the lack of applicable methods.

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