Method and system for determining elastic modulus of a composite material

Abstract

The invention discloses a method and a system for determining the elastic modulus of a composite material. According to the vibration differential equation of the one-dimensional structural form of the composite material, the present invention determines the calculation formula of the elastic modulus at any point in the weak form of the composite material structure to be measured, which is recorded as the weak form elastic modulus calculation model; according to the weak form elastic modulus The calculation model determines the calculation formula of the elastic modulus at any point in the area to be measured under the broadband excitation condition of the composite material structure, which is the elastic modulus calculation model of the broadband excitation. By adopting the method and system for determining the elastic modulus of the composite material provided by the invention, the non-destructive, in-situ and local elastic modulus measurement of the composite material can be performed. Moreover, the present invention adopts a weak form calculation method, which can avoid the problem of signal-to-noise ratio decrease caused by solving the high-order partial derivative of the vibration displacement.

Description

technical field [0001] The invention relates to the field of testing mechanical properties of composite materials, in particular to a method and system for determining elastic modulus of composite materials. Background technique [0002] Composite materials have high specific stiffness, specific strength and corrosion resistance, so they are widely used in many engineering fields, such as aviation, aerospace, ships and automobiles. In order to ensure that the composite material has good safety and reliability before it is put into use, the most effective way is to take random sampling for inspection, and evaluate the mechanical properties of the composite material through the tensile failure test of typical specimens. However, this testing method, while effective, is destructive to the material. Therefore, it is impossible to carry out factory tests on all composite products, and it is even more difficult to meet the in-situ, non-destructive and local mechanical performance...

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