GB/T 31211.1-2024Non-destructive testing - Ultrasonic guided wave testing - Part 1: General principles (English PDF)

1 Scope

This document describes the use of various ultrasonic guided waves such as magnetostrictive, piezoelectric ultrasonic, electromagnetic ultrasonic, laser ultrasonic, etc: to detect the components under test:

Use method:

This document is applicable to elastic solid structural parts with regular cross-sectional geometric shapes such as tubes, bars, plates, wires (including ropes and cables), profiles, etc:

Ultrasonic guided wave testing:

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document:

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to

This document:

GB/T 9445 Qualification and certification of non-destructive testing personnel

GB/T 12604:1 Nondestructive testing terminology Ultrasonic testing

GB/T 20737 General terms and definitions for non-destructive testing

3 Terms and definitions

The terms and definitions defined in GB/T 12604:1 and GB/T 20737 and the following apply to this document:

3:1

Waveguide

A structure that directs ultrasound waves of a specific frequency:

Note: For example, thin bars, tubes or thin plates: When the wall thickness is close to the wavelength, the longitudinal and transverse waves are affected by the boundary conditions and do not propagate in the original mode:

It is spread in a specific form:

3:2

Ultrasonic guided wave

Ultrasonic waves propagating along the surface or inside of a waveguide (3:1) structure in a specific waveguide mode (3:6):

3:3

Dispersion

The phenomenon that wave speed changes with frequency:

3:4

Dispersive equation

The relationship between wave velocity and frequency is reflected by the equations that satisfy the special solutions of elastic dynamics according to specific boundary conditions:

3:5

Dispersion curve dispersioncurve

The curve of the relationship between wave velocity and frequency obtained by solving the dispersion equation (3:4):

Note: The abscissa of the dispersion curve represents the frequency-thickness product, frequency, wavelength or wave number, and the ordinate represents the group velocity or phase velocity:

GB/T 32073.1 | GB/T 32335 | GB/T 28784.2 | GB/T 31211.3 | GB/T 31211.2 | GB/T 31207 | […]