Standard Briefing:Stadard ID: GB/T 44525-2024
Stadard Title: Non-destructive testing - Ultrasonic testing - Specification for resin matrix composite reference block
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Basic Data: | Standard ID | GB/T 44525-2024 (GB/T44525-2024) | | Description (Translated English) | Non-destructive testing - Ultrasonic testing - Specification for resin matrix composite reference block | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 19.100 | | Word Count Estimation | 26,251 | | Date of Issue | 2024-09-29 | | Date of Implementation | 2024-09-29 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | Contents, Scope, and Excerpt:GB/T 44525-2024. Specification for comparison test blocks for non-destructive ultrasonic testing of resin-based composite materials
National Standard of the People's Republic of China
ICS 19.100CCS J 04
Nondestructive testing of resin-based composite materials using ultrasonic testing
Specifications for comparison test blocks
Non⁃destructive testing-Ultrasonic testing-Specification for resin matrix
composite reference block
2024-09-29 Release
2024-09-29 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of ContentsPreface Ⅲ
Introduction Ⅳ
1 Scope·····1
2 Normative references ····1
3 Terms and Definitions 1
4 Design·····3
5 Production·····4
6 Inspection 9
7 Marking and Use 10
8 Quality Control····10
Appendix A (Informative) Selection of Reference Reflector Manufacturing Methods 11
Appendix B (Informative) Use of Comparison Test Blocks 12
Appendix C (Informative) Determination of the detection threshold of C-scan display 15
References ·····17
ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Technical Committee for Standardization of Nondestructive Testing (SAC/TC 56).
This document was drafted by. Shanghai Aircraft Manufacturing Co., Ltd., Shanghai Materials Research Institute Co., Ltd., Commercial Aircraft Corporation of China, Ltd.
Co., Ltd., Jiangsu Special Equipment Safety Supervision and Inspection Institute, and Shandong Ruixiang Mould Co., Ltd.
The main drafters of this document are. Jiang Liping, Zhang Dongmei, Xiao Peng, Jiang Jiansheng, Ding Jie, Chen Jian, Yuan Yuhui, Zhang Yanbing, Han Lina, Wan Haitao,
Wei Yulong.
introduction
Ultrasonic test blocks are mainly divided into two types. One is used to evaluate and calibrate ultrasonic testing equipment and has a specified chemical composition, surface
Standard test blocks with surface roughness, heat treatment and geometric shape; one is similar to the acoustic properties of the test piece or the material being tested and contains clear reference
Reflectors are used to adjust the amplitude and/or time base of the ultrasonic detector to compare the detected discontinuity signal with the signal generated by the known reflector.
A reference block to compare the signals.
When the reference block is used to adjust the amplitude and/or time base of the ultrasonic detector and compare it with the detected discontinuous signal, the reference block
A reference reflector with a clear meaning is set inside; when the comparison test block is only used to adjust the amplitude and (or) time baseline of the ultrasonic detector, the reference reflector is used.
The bottom surface of the comparison test block is used as a reference reflector, that is, a step comparison test block without a reference reflector inside; the comparison test block can also be used only for comparison with the detected
The discontinuous signal is compared to obtain the detection threshold, such as when ultrasonic testing and evaluating the internal pores of resin-based composite parts.
Porosity comparison test blocks used.
At present, composite materials are widely used in sports equipment, automobile manufacturing, shipbuilding and aerospace.
Composite materials are the most mature and widely used type of composite materials. However, due to the types of matrix materials and reinforcing materials in resin-based composite materials
The various manufacturing processes lead to large differences in the acoustic properties of the materials. Standard test blocks cannot be used in the testing process, so the direct use
Comparison test blocks.
This document fully considers the method for making reference reflectors of ultrasonic testing comparison test blocks for resin-based composite materials that have been stably applied.
Including embedded method, edge insert method, external sticking method, flat bottom hole method and other special methods, clarify the comparative test of ultrasonic testing of resin-based composite materials
The requirements for the blocks are to standardize the design, production and inspection methods of the comparison blocks for ultrasonic testing of resin-based composite materials, and to guide the construction of resin-based composite materials.
Ultrasonic testing in practice.
Nondestructive testing of resin-based composite materials using ultrasonic testing
Specifications for comparison test blocks
ScopeThis document specifies the design, production, inspection, marking and quality control requirements for reference test blocks used for ultrasonic testing of resin-based composite parts.
This document is applicable to the ultrasonic testing of resin-based composite laminates (including R corners), plate/plate bonding structures, sandwich structures and other products.
Design, production, inspection, marking and quality control requirements for comparison test blocks. Design of comparison test blocks for other non-destructive testing methods of resin-based composite materials
Design, production, inspection, marking and quality control are carried out as reference.
Normative ReferencesThe 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 3365 Test method for void content and fiber volume content of carbon fiber reinforced plastics
GB/T 9445 Qualification and certification of non-destructive testing personnel
GB/T 20737 General terms and definitions for non-destructive testing
Terms and DefinitionsThe terms and definitions defined in GB/T 20737 and the following apply to this document.
3.1
Laminate/laminate bonding
A layered composite structure formed by bonding laminates (3.4) and laminates (3.4) or other plate-like materials by adhesive.
3.2
reference reflector
Compare the reflectors in the test block with known shape, size and distance from the test surface.
3.3
Reference echo referenceecho
The echo from the specified reference reflector (3.2).
[Source. GB/T 12604.1-2020, 5.4.4]
3.4
Laminate
An integral board made by pressing two or more layers of the same or different materials.
[Source. GB/T 3961-2009, 3.5.7]
3.5
Delamination
The phenomenon of interlayer separation in laminated composite materials (3.6).
[Source. GB/T 40724-2021, 5.90, modified]
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