Ultrasonic nondestructive detection method of material mico-crack expanded size

A non-destructive testing and micro-crack technology, which is applied in the analysis of materials, the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, and the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., to achieve high detection accuracy, low detection cost, and fast detection speed Effect

Inactive Publication Date: 2019-01-29
EAST CHINA UNIV OF SCI & TECH
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these existing literatures all focus on the characterization and evaluation of material damage, and there are few studies on the propagation of microcracks by nonlinear ultrasonic signals. The si

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
  • Ultrasonic nondestructive detection method of material mico-crack expanded size
  • Ultrasonic nondestructive detection method of material mico-crack expanded size
  • Ultrasonic nondestructive detection method of material mico-crack expanded size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Below, in conjunction with the accompanying drawings, preferred embodiments of the present invention are given and described in detail, so that the functions and features of the present invention can be better understood.

[0025] Such as figure 1As shown, the present invention provides a method for ultrasonic non-destructive testing of material microcrack extension size, the ultrasonic non-destructive testing method adopts such as figure 2 The shown nonlinear ultrasonic Lamb wave measurement system, and the method is used to measure a sample 32 to be tested, specifically comprising the following steps:

[0026] S1: Build a nonlinear ultrasonic Lamb wave measurement system, the measurement system includes a linear ultrasonic excitation system 1 and an excitation probe 2 electrically connected to each other, and a receiving probe 4 and an oscilloscope 5 electrically connected to each other, the excitation probe 2 and the receiving probe 4 Wedges are provided at the end...

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

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention provides an ultrasonic nondestructive detection method of material micro-crack expanded size. The method comprises the following steps: constructing a measurement system; manufacturing multiple reference samples, and performing repeated fatigue test on each reference sample; performing metallographic observation after each fatigue test so as to obtain a micro-crack length of each reference sample, and performing ultrasonic nonlinear Lamb wave measurement to compute a nonlinear parameter beta0 of each reference sample; obtaining a nonlinear parameter-fatigue life curve, marking micro-crack sizes corresponding to various points on the curve; performing nonlinear ultrasonic Lamb wave measurement on the to-be-tested sample to obtain the nonlinear parameter beta0, and finding outthe point corresponding to the nonlinear parameter beta0 in the above curve, and finding the length of the micro-crack corresponding to the point. A relationship of the micro-crack size and the nonlinear parameter is used for judging the micro-crack length and representing the fatigue damage, in-service equipment cannot be damaged, and the micro-crack state of the material on active can be quicklydetected at low cost.

Description

technical field [0001] The invention relates to a method for measuring the length of a material microcrack, in particular to an ultrasonic nondestructive detection method for the expansion size of a material microcrack. Background technique [0002] Planar layered solid structures are widely used in many fields such as aviation, spaceflight and information science. In the process of service, due to the influence of internal factors and external environment, the degradation of material properties will occur. The early performance degradation of materials accounts for most of the fatigue life. Under the influence of alternating load, temperature and other factors, microcracks may initiate, expand rapidly, and break suddenly, causing serious hidden dangers to the safe operation of engineering components. Therefore, effective detection and evaluation methods for early microcrack growth in materials have been developed. becomes very important. [0003] Lamb waves have been wid...

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): G01N29/04
CPCG01N29/041G01N2291/0289
Inventor 项延训轩福贞涂善东朱武军刘长军马聪云
Owner EAST CHINA UNIV OF SCI & TECH
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