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GB/T 46910.1-2025Non-destructive testing - Acoustic vibration testing of resin matrix composite parts - Part 1: Tap testing (English PDF)

无损检测　树脂基复合材料制件的声振检测　第1部分：敲击法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 31, 2025

Implementation date

December 31, 2025

Scope

GB/T 46910.1-2025 is the English-translated version of 无损检测　树脂基复合材料制件的声振检测　第1部分：敲击法.

GB/T 46910.1-2025 is the Chinese standard "Non-destructive testing - Acoustic vibration testing of resin matrix composite parts - Part 1: Tap testing".

Its scope clause reads: This document describes a percussion testing method for the internal quality of resin-based composite parts based on acoustic vibration testing, and specifies the percussion testing procedures.

Requirements such as general requirements, testing procedures, testing records and reports. This document applies to resin-based composite structures such as laminated structures, sheet/sheet adhesive structures, and sandwich structures made of carbon fiber, glass fiber, and blended fiber materials.

Impact testing for delamination or debonding of composite material parts. This document does not apply to impact testing of parts with delamination or debonding depths not exceeding 2 mm.

Other materials, thicknesses, or structures, etc. The impact test of the component shall be performed in accordance with the same procedure. Its clauses include terms and definitions.

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Document preview — GB/T 46910.1-2025

National Standard of the People's Republic of China

ICS: 19.100
Classification: J 04

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
Introduction
1.Scope
2 Normative References
3.Terms and Definitions
4.Method Principles
5 General Requirements
6.Testing Steps
7.Inspection Records and Reports
Appendix A (Informative) Hammer Design
Appendix B (Informative) Methods for Discontinuous Artificial Production
Appendix C (Informative) Functional Verification Test Block Design

1 Scope

This document describes a percussion testing method for the internal quality of resin-based composite parts based on acoustic vibration testing, and specifies the percussion testing procedures.

Requirements such as general requirements, testing procedures, testing records and reports.

This document applies to resin-based composite structures such as laminated structures, sheet/sheet adhesive structures, and sandwich structures made of carbon fiber, glass fiber, and blended fiber materials.

Impact testing for delamination or debonding of composite material parts.

This document does not apply to impact testing of parts with delamination or debonding depths not exceeding 2 mm. Other materials, thicknesses, or structures, etc.

The impact test of the component shall be performed in accordance with the same procedure.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 20737 General Terms and Definitions for Nondestructive Testing

GB/T 44525 Specification for Comparative Test Blocks of Resin-Based Composite Material Parts by Ultrasonic Testing in Non-Destructive Testing

3 Terms and Definitions

The terms and definitions defined in GB/T 20737 apply to this document.

3.1

A non-destructive testing method that uses vibration excitation on the test piece to detect the quality of the workpiece.

3.2 tap testing

A non-destructive testing method that uses mechanical impact to stimulate vibration in the workpiece to detect its quality.

3.3

The duration from contact to detachment of the hammer from the surface of the workpiece during hammer strike excitation.

3.4 Sound power spectrum

Characterizes the energy distribution of acoustic signals at different frequencies.

Note. This is usually represented by a curve with frequency on the x-axis and power or energy density on the y-axis, reflecting the intensity of each frequency component in the signal; centroid frequency (3.5).

It is based on power spectrum calculation, and the two are often used together. First, abnormal frequency bands are identified by power spectrum, and then the changes are quantified by centroid frequency.

3.5 Gravity frequency

The frequency that reflects the centroid location of the signal energy distribution.

Note. The weighted average frequency of the signal spectrum describes the center position of the signal spectrum. A higher center frequency indicates that the signal has more high-frequency components.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 18 pages — is available in the English PDF.

Referenced standards

Normative references

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