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Axial stress monitoring method for stringers with symmetrical cross-section based on high-order acoustoelastic ultrasonic guided waves

A technology of ultrasonic guided wave and axial stress, applied in the direction of force/torque/work measuring instrument, measuring force, measuring device, etc.

Active Publication Date: 2020-06-02
DALIAN UNIV OF TECH
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Problems solved by technology

When using the finite element method to calculate the effect of stress load on the propagation velocity of structural waves, the effect of the third-order elastic constant on the acoustic elasticity is ignored, which leads to the phenomenon that the experimental results do not match the calculated results.
The method of ultrasonic guided wave acoustoelastic analysis is only suitable for simple structures such as plates, not for symmetrical cross-sections or more complex structures

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  • Axial stress monitoring method for stringers with symmetrical cross-section based on high-order acoustoelastic ultrasonic guided waves
  • Axial stress monitoring method for stringers with symmetrical cross-section based on high-order acoustoelastic ultrasonic guided waves
  • Axial stress monitoring method for stringers with symmetrical cross-section based on high-order acoustoelastic ultrasonic guided waves

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[0038] In order to make the technical solutions and advantages of the present invention clearer, the following describes the technical solutions in the embodiments of the present invention clearly and completely in conjunction with the drawings in the embodiments of the present invention:

[0039] Such as figure 1 The shown method for monitoring axial stress of symmetrical cross-section beams based on high-order acoustic elastic ultrasonic guided waves is as follows:

[0040] 1.1 Using semi-analytical finite element solution, finite element discretization is performed on half of the cross-section of the symmetrical section beam. The symmetric mode and the anti-symmetric mode are completed by setting the boundary conditions. The horizontal displacement of the left boundary node of the symmetric mode is fixed to 0, and the displacement of the left boundary node of the antisymmetric mode in the vertical direction and the wave propagation direction is fixed to 0. The phase velocity an...

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Abstract

The invention discloses a supersonic guide wave axial stress monitoring method for a symmetrical cross-section stringer based on high-order acoustic elasticity. A semi-analytical finite element is combined with a higher-order acoustic elasticity based theory to research influence of the axial stress on guide wave spreading of the symmetrical cross-section stringer, the speed and speed change of the guide wave with / without a stress are solved, proper stress monitoring mode and excitation frequency are selected according to solving results, a sensor array is designed according to spreading characteristics of the mode, and integral stress monitoring is completed. The method fills the blank in supersonic guide wave stress monitoring of the symmetrical cross-section stringer, and general idealsand method are provided for stress monitoring for the supersonic guide wave of the symmetrical cross-section stringer.

Description

Technical field [0001] The invention relates to the technical field of axial stress monitoring, in particular to an axial stress monitoring method of a symmetrical section beam based on high-order acoustic elastic ultrasonic guided waves. Background technique [0002] Among the causes of structural damage accidents, structural instability and stress concentration cannot be ignored. These are all caused by the overload of the components. Therefore, the force status of the structure is tested, and the structural health monitoring field Is an important challenge. Ultrasonic guided wave technology has the advantages of high detection accuracy and high sensitivity, and has become an important method in stress monitoring. The stress monitoring technology is developed based on the acoustoelasticity theory. The acoustoelasticity theory is established by studying the relationship between elastic wave propagation velocity and stress. [0003] Ultrasonic guided wave stress monitoring has hi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/25G01L5/173
CPCG01L1/255G01L5/16
Inventor 武湛君杨正岩张佳奇刘科海周凯郑跃滨马书义高东岳
Owner DALIAN UNIV OF TECH
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