Valid

GB/T 28896-2023Metallic materials - Method of test for the determination of quasistatic fracture toughness of welds (English PDF)

金属材料焊接接头准静态断裂韧度测定的试验方法

Preview PDF

This is a limited preview

Buy now to download the full PDF (41 pages)

Need quotation for your management?

Get a formal quotation for GB/T 28896-2023 in 30 minutes.

Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 17, 2023

Implementation date

July 1, 2023

Scope

GB/T 28896-2023 is the English-translated version of 金属材料焊接接头准静态断裂韧度测定的试验方法.

GB/T 28896-2023 is the Chinese standard "Metallic materials - Method of test for the determination of quasistatic fracture toughness of welds".

Its scope clause reads: This document describes the stress intensity factor (K), crack tip opening displacement [CTOD(delta)] and J-integral for testing welded joints of metallic materials: test method: This document is a supplement to GB/T 21143, GB/T 21143 covers the test methods for the fracture toughness test of metal base materials In all aspects, this document is used in conjunction with GB/T 21143: This document is suitable for determining the characteristic value of fracture toughness and not suitable for determining the effective R-curve (crack growth resistance curve), but this document The processing method of the sample in the workpiece is also applicable to the R-curve determination of the weld metal: The tests specified are for welded, machined defects: Metal material specimens with prefabricated fatigue cracks, the notch is located in the target area of the weld metal or heat-affected zone, if applicable, fatigue cracks shall be The validity of the crack location is evaluated:. Its clauses include terms and definitions.

Found what you need?

Document preview — GB/T 28896-2023

National Standard of the People's Republic of China

ICS: 77.040.10
Classification: H22

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

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Symbols and descriptions
5 Principle
6 Specimen design, orientation and notch location selection
7 Metallographic inspection before machining
8 Machining
9 Sample prefabrication
10 Test device, test requirements and steps
11 Metallographic inspection after test
12 Analysis of test results
13 Test report
Appendix A (informative) Sample notch position example
Appendix B (informative) Metallographic inspection example before and after the test
Appendix C (Informative) Elimination of Residual Stress and Prefabrication of Fatigue Cracks
Appendix D (Normative) Evaluation of pop-in effects
Appendix E (Normative) Shallow Notch Specimen Test

1 Scope

This document describes the stress intensity factor (K), crack tip opening displacement [CTOD(delta)] and J-integral for testing welded joints of metallic materials:

test method:

This document is a supplement to GB/T 21143, GB/T 21143 covers the test methods for the fracture toughness test of metal base materials

In all aspects, this document is used in conjunction with GB/T 21143:

This document is suitable for determining the characteristic value of fracture toughness and not suitable for determining the effective R-curve (crack growth resistance curve), but this document

The processing method of the sample in the workpiece is also applicable to the R-curve determination of the weld metal: The tests specified are for welded, machined defects:

Metal material specimens with prefabricated fatigue cracks, the notch is located in the target area of the weld metal or heat-affected zone, if applicable, fatigue cracks shall be

The validity of the crack location is evaluated:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references

Only the version corresponding to the date applies to this document; for undated references, the latest version (including all amendments) applies used in this document:

GB/T 21143 Unified test method for quasi-static fracture toughness of metallic materials (GB/T 21143-2014, ISO 12135:

2002, MOD)

3 Terms and Definitions

The following terms and definitions defined in GB/T 21143 apply to this document:

3:1 stretch zone width stretchzonewidth

ZW The length of crack extension produced during crack passivation:

Note: Crack passivation generally occurs before unstable crack growth, pop-in or slow and stable crack growth, and its location is at the same location as the prefabricated fatigue crack:

above a plane:

3:2 target area targetarea location of the preformed fatigue crack tip in the weld metal (3:7) or heat-affected zone (3:9)

3:3

Breakthrough pop-in

A sudden discontinuity point appears on the force-displacement record curve, which is generally characterized by a sudden increase in displacement and a rapid decrease in force, and then the force

And the displacement can continue to increase above the value at which the discontinuity started:

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 41 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 21143-2014Metallic materials - Unified method of test for determination of quasistatic fracture toughness

ISO 12135

Cited by

Similar standards

GB 38031-2025|GB/T 28896|GB/T 28896-2012|GB/T28896-2023|GB/T 1|GB/T 21143|GB/T 21143-2014|GB/T 24523

How to Download GB/T 28896-2023

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.