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GB/T 6398-2017Metallic materials -- Fatigue testing -- Fatigue crack growth method (English PDF)

金属材料疲劳试验疲劳裂纹扩展方法

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

Level / Type

National · Recommended

Issue date

July 12, 2017

Implementation date

April 1, 2018

Scope

GB/T 6398-2017 is the English-translated version of 金属材料疲劳试验疲劳裂纹扩展方法.

GB/T 6398-2017 is the Chinese standard "Metallic materials -- Fatigue testing -- Fatigue crack growth method".

Its scope clause reads: This standard specifies the stress intensity factor range from the fatigue crack growth threshold deltaKth to the fatigue crack before the start of rapid instability cracking The method of determining the rate of expansion.

This standard applies to the measurement of isotropic metal materials in the linear elastic stress-based, and only perpendicular to the crack surface of the force (I type Force conditions) and the fixed stress ratio R under the conditions of the crack growth rate. Its clauses include normative reference documents; terms and definitions.

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Document preview — GB/T 6398-2017

National Standard of the People's Republic of China

ICS: 77.040.10
Classification: H 22

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

Preface
1 Scope
2 normative reference document
3 Terms and definitions
4 symbols and abbreviations
5 Sample
7 Test Procedure
8 Crack length measurement
9 Calculate
10 Test Report
Appendix A (informative) Non - visual measurement of crack length - potential method
Appendix B (informative) Non - visual measurement of crack length - Flexibility method
Appendix C (informative) Specific requirements for the determination of fatigue crack propagation in aqueous media
Appendix D (informative) Fatigue small crack propagation method
Appendix E (informative) Method for determination of fatigue crack opening force

1 Scope

This standard specifies the stress intensity factor range from the fatigue crack growth threshold deltaKth to the fatigue crack before the start of rapid instability cracking

The method of determining the rate of expansion.

This standard applies to the measurement of isotropic metal materials in the linear elastic stress-based, and only perpendicular to the crack surface of the force (I type

Force conditions) and the fixed stress ratio R under the conditions of the crack growth rate.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article

Pieces. For undated references, the latest edition (including all modifications) applies to this document.

GB/T 10623 Mechanical properties test for metallic materials (GB/T 10623-2008, ISO 23718..2007, MOD)

GB/T 16825.1 Tests for static uniaxial testing machines - Part 1. Tests for force measurement systems of tension and/or pressure testing machines

Calibration (GB/T 16825.1-2008, ISO 7500-1..2004, IDT)

GB/T 25917 Axial afterburner fatigue testing machine Dynamic force calibration (GB/T 25917-2010, ISO 4965. 1979, MOD)

ISO 23788 Metal material fatigue testing machine Coaxial degree calibration (Metalicmaterials-Verificationofthealignment offatiguetestingmachines

3 terms and definitions

The following definitions and definitions as defined in GB/T 10623 apply to this document.

3.1 Crack length

A linear measure of the principal plane dimension from the reference plane to the crack tip.

Note. also known as crack size.

3.2 Cycle

The repetition of the force, stress and other minimum period of time.

Note. The terms "fatigue cycle", "force cycle" and "stress cycle" can be used instead of each other, and the letter N is used to represent the number of cycles of force experienced.

3.3 Fatigue crack propagation rate

da/dN

The amount of expansion of the fatigue crack corresponding to the unit cycle.

3.4 Maximum force

Fmax

Force in the cycle of the largest algebraic value, pull the load is positive, pressure to the load is negative.

GB/T 4340.1 | GB/T 8358 | GB/T 7964 | GB/T 7997 | GB/T 6396 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 91 pages — is available in the English PDF.

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