1 Scope
This standard specifies the principle, terms, definitions and symbols, specimen, apparatus, procedures, result treatment and report for fracture toughness testing method under slowly and continuously increasing tensile load.
This standard is applicable to rectangular cross-section tension specimen made of metallic material, for which semielliptical or partial circular surface crack is available.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 228 Metallic Materials - Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892: 1998)
GB/T 10623 Metallic Material - Mechanical Testing - Vocabulary (GB/T 10623-2008, ISO 23718: 2007, MOD)
GB/T 12160 Calibration of Extensometers Used in Uniaxial Testing (GB/T 12160-2002, ISO 9513: 1999, IDT)
GB/T 16825.1 Verification of Static Uniaxial Testing Machines - Part 1: Tension/Compression Testing Machines - Verification and Calibration of the Force-measuring System (GB/T 16825.1-2002, ISO 7500-1: 1999, IDT)
GB/T 20832 Metallic Materials - Designation of Test Specimen Axes in Relation to Product Texture (GB/T 20832-2007, ISO 3785: 2002, IDT)
3 Principle
This test is used for evaluating the bearing capacity of plates or plate-like structural parts with surface cracks during service. Where the service conditions are the same as experiment conditions, the result of surface crack tension testing may be directly used in design.
4 Terms, Definitions and Symbols
4.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 10623 and the following apply.
Foreword i
1 Scope
2 Normative References
3 Principle
4 Terms, Definitions and Symbols
5 Specimen
6 Testing Apparatus
7 Testing Procedures
8 Treatment of Test Result
9 Testing Report
Annex A (Normative) Fatigue Crack Size and Shape Control
Annex B (Normative) Stress Intensity Factor Equation for Surface Crack Fracture Toughness Testing
Annex C (Informative) Values of
