GB/T 21239-2022 English PDF

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GB/T 21239-2022: Test method for compression after impact properties of fiber reinforced plastic laminates
Status: Valid

GB/T 21239: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21239-2022	339	Add to Cart	4 days	Test method for compression after impact properties of fiber reinforced plastic laminates	Valid
GB/T 21239-2007	479	Add to Cart	3 days	Test method for compression after impact properties of fiber reinforced plastic laminates	Obsolete

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Basic data

Standard ID: GB/T 21239-2022 (GB/T21239-2022)
Description (Translated English): Test method for compression after impact properties of fiber reinforced plastic laminates
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Q23
Classification of International Standard: 83.120
Word Count Estimation: 18,190
Date of Issue: 2022-10-14
Date of Implementation: 2023-02-01
Older Standard (superseded by this standard): GB/T 21239-2007
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 21239-2022: Test method for compression after impact properties of fiber reinforced plastic laminates

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Test method for compression after impact properties of fiber reinforced plastic laminates ICS 83.120 CCSQ23 National Standards of People's Republic of China Replacing GB/T 21239-2007 Fiber Reinforced Plastic Laminate Test method for compression performance after impact Published on 2022-10-12 2023-02-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface I 1 Scope 1 2 Normative references 1 3 Terms, Definitions and Symbols 1 4 Method principle 1 5 Sample 2 6 Test conditions 4 7 Test equipment 4 8 Test Step 5 9 Result calculation 6 10 Test report 7 Appendix A (Informative) Determination of Conditional Impact Energy 8 Appendix B (Informative) Impact Test Support Fixture 10 Appendix C (Informative) Compression Test Fixtures After Impact 11

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. This document replaces GB/T 21239-2007 "Test method for compression performance of fiber-reinforced plastic laminates after impact", and Compared with GB/T 21239-2007, in addition to structural adjustment and editorial changes, the main technical changes are as follows. a) Added the content and calculation method of "effective compressive modulus after impact" and "ultimate compressive strain after impact" (see Chapter 1, 9.2 and 9.3); b) Two definitions of "conditional impact energy" and "impact energy cut-off value" have been added (see Chapter 3); c) increased the thickness of the arbitration specimen (see 5.2); d) Other layup methods of laminates have been changed (see 5.3.3, 5.3.3 of the.2007 edition); e) The requirements for non-destructive testing of laminates are added (see 5.4); f) Added the content of "Conditional Impact Energy" (see 6.2.2); g) The provisions of three measuring instruments, micrometer, caliper and depth gauge, have been added (see 7.2.2~7.2.4); h) Added the provisions when the impact damage size is too large (see 8.5); i) The provisions for the assembly of the specimen and the compression fixture have been added (see 8.7); j) The requirements for the alignment of specimen installations have been added (see 8.8); k) Added provisions for applying initial load, unloading, and strain gauge zeroing and balancing (see 8.9); l) Added provisions for fixing lateral plates and sliding plates (see 8.10); m) the operation of checking the strain values of the four strain gages has been changed (see 8.11, 8.7 of the.2007 edition); n) Added "Test Validity Judgment Method" (see 8.13). Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Building Materials Federation. This document is under the jurisdiction of the National Standardization Technical Committee of Fiber Reinforced Plastics (SAC/TC39). This document is drafted by. China Aviation Development Beijing Institute of Aeronautical Materials, Weihai Guangwei Composite Materials Co., Ltd., Aviation Industry First Aircraft Design and Research Institute, Beijing FRP Research and Design Institute Co., Ltd. The main drafters of this document. Chen Xinwen, Wang Haipeng, Li Fengxuan, Wang Xiang, Ma Liting, Wang Li, Wang Yana, Deng Liwei, Yang Yang, Wang Zhandong, Zhang Qin and Tian Yaowei. This document was first published in.2007 and this is the first revision. Fiber Reinforced Plastic Laminate Test method for compression performance after impact

1 Scope

This document specifies the method, principle, sample, test conditions, test equipment, test Test procedures, result calculations and test reports. This document applies to the post-impact compressive strength, post-impact effective compression of continuous fibre-reinforced plastic laminates with balanced symmetrical plies Determination of modulus and ultimate compressive strain after impact.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. GB/T 1446 General Principles of Test Methods for the Properties of Fiber Reinforced Plastics GB/T 3961 Terminology of Fiber Reinforced Plastics 3 Terms, Definitions and Symbols 3.1 Terms and Definitions The terms and definitions defined in GB/T 3961 and the following apply to this document. 3.1.1 The single-layer thickness of the fiber-reinforced plastic laminate obtained by calculation. 3.1.2 The impact energy required for the material to reach a pit of a specified depth. 3.1.3 The maximum impact energy value determined according to the service conditions of the material. 3.2 Symbols The following symbols apply to this document. i, j, k---the number of times of repeated continuous laying of a single layer in the fiber-reinforced plastic laminate; n --- the number of repetitions of the laying unit on one side of the symmetrical plane of the fiber-reinforced plastic laminate; S --- Symmetrical laminate, after the fiber reinforced plastic paving unit is repeatedly paved n times, the symmetrical paving is carried out.

4 Principles of the method

After the sample is impacted with a certain energy at the center of the sample along the thickness direction, a compressive load is applied to the sample along the length direction until the sample is ......

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