Quick determination method and system for elastic parameters of fiber reinforced composite material

Abstract

The invention discloses a quick determination method and system for elastic parameters of a fiber reinforced composite material. According to the method, external excitation is utilized to make the fiber reinforced composite material test piece with an anisotropic laminated structure in a sub-vacuum sealed sound field environment generate free vibration, and an audio frequency collection device and a data collection device are utilized to collect audio frequency signals generated by the vibration; fourier transform analysis is utilized to obtain frequency spectrums of the audio frequency signals, and natural vibration frequencies can be measured; the natural vibration frequencies are brought into a structure vibration natural vibration frequency calculating model which is established by afinite element method of the fiber reinforced composite material to be fitted to obtain material parameter results of a test piece of the fiber reinforced composite material. The quick determination method and system disclosed by the invention can simply obtain material parameters of the engineering application accuracy of the anisotropic laminated structure composite materials in low cost and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of material testing, in particular to a method and system for quickly measuring elastic parameters of fiber-reinforced composite materials. Background technique [0002] Fiber-reinforced composite materials are currently the most mature and widely used type of composite materials, and their biggest advantages are high specific strength and large specific modulus. Specific strength and specific modulus are a kind of material performance index to measure the bearing capacity and stiffness characteristics of structural materials under the premise of equal mass. For aviation and aerospace structural components, transport vehicles, ships and other moving structures, this is a very important indicator. High specific strength and specific modulus often mean that structures with good performance and light weight can be made. Table 1 gives a comparison of the mechanical properties of several typical laminated compos...

AI Technical Summary

Problems solved by technology

Using a uniaxial material testing machine to test material parameters, usually only fiber-reinforced composite materials with simple lay-up structures can be tested. For fiber-reinforced composite materials with complex lay-up structures, a special multi-axis material testing machine is often used to test, but the price of this equipment Expensive and cumbersome test methods are not conducive to the low-cost and efficient application of composite materials in engineering applications

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