Method for measuring material acoustics non-linear coefficient using rayleigh surface wave

A technology of nonlinear coefficients and surface waves, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, generation of ultrasonic waves/sonic waves/infrasonic waves, and measurement devices, which can solve the problem of inability to guarantee accurate and reliable measurement results and are not suitable for acoustic nonlinearity Coefficient measurement and other issues, to achieve the effect of simple and easy measurement process, restrain the influence of random factors, and high measurement accuracy

Inactive Publication Date: 2007-12-05
BEIJING JIAOTONG UNIV
View PDF0 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are only a few reports on the corresponding measurement using body waves, but its disadvantage is that it is not suitable for the measurement of the acoustic nonlinear coefficient of larger plate structures.
There are also very few reports on the measurement of acoustic nonlinear coefficients using Rayleigh waves, but th...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring material acoustics non-linear coefficient using rayleigh surface wave
  • Method for measuring material acoustics non-linear coefficient using rayleigh surface wave
  • Method for measuring material acoustics non-linear coefficient using rayleigh surface wave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] To use Rayleigh surface waves to measure the acoustic nonlinear coefficients of aluminum alloys AA2024 and AA6061, the specific implementation steps are:

[0025] (1) Excitation of Rayleigh surface waves: After carefully polishing and polishing the surface of the specimen made of aluminum alloy AA2024, grease is used as the coupling agent between the piezoelectric sensor and the specimen, as shown in Figure 2. The piezoelectric sensor is fixed on the bracket by bolts, and the piezoelectric sensor is in close contact with the edge of the specimen through the angle adjustment screw. Adjust the angle adjustment screw to maximize the intensity of the excited Rayleigh wave. As shown in Figure 1, the RITEC RAM-5000Mark IV gate circuit signal amplifier is used as the signal source to generate the signal, and the period of the output sine pulse...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a material acoustic non-linear coefficient measuring method through Relay surface wave, which comprises the following steps: adopting specific signal amplifier as signal source; assembling piezoelectric sensor on the rim of the detector piece directly to excite the Relay wave; using laser interferometer to gather the Relay wave signal on the gathered piece surface; proceeding Fuliye conversion for the gathered Relay wave signal rapidly; obtaining the basic frequency and high frequency component in the signal; affirming the relative acoustic non-linear coefficient of the material effectively and precisely.

Description

technical field [0001] The invention relates to a method for measuring the acoustic nonlinear coefficient of materials by using Rayleigh surface waves, and belongs to the technical field of non-destructive detection of performance degradation of metal materials. Background technique [0002] For in-service structural elements in mechanical equipment and engineering structures, under the action of external loads (including environmental effects), their life can generally be divided into three stages: early degradation of mechanical properties (including physical and chemical aging and degradation) ), initiation and accumulation of damage (microvoids and microcracks), and final fracture failure. Among them, the initiation and accumulation of damage have been widely studied on the basis of mesomechanics, damage mechanics and the combination of the two disciplines. There are now also a large number of data and a large number of models to predict crack growth under cyclic loadin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N29/00G01N29/34G01N29/46
Inventor 税国双汪越胜曲建民王正道祝瑛
Owner BEIJING JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap