Metallic materials. Determination of plane-strain fracture toughness

BS EN ISO 12737:2010 Metallic materials. Determination of plane-strain fracture toughness

BS EN ISO 12737 is an International Standard which specifies the ISO method for determining the plane-strain fracture toughness of homogeneous metallic materials using a specimen that is notched and precracked by fatigue, and subjected to slowly increasing crack displacement force.

Contents of BS EN ISO 12737:

Foreword

1 Scope

2 Normative references

3 Terms and definitions

4 Symbols and designations

5 Principle

6 Apparatus

6.1 Testing machine and force measurement

6.2 Fatigue cracking machine

6.3 Displacement gauge

6.4 Testing fixtures

7 Test specimen size, configuration and preparation

7.1 Specimen size

7.2 Recommended specimen proportions

7.2.1 Recommended specimens

7.2.2 Alternative proportions

7.2.3 Alternative specimen configurations

7.2.4 Fatigue-crack starter notch

7.3 Specimen preparation and fatigue precracking

7.3.1 Material condition

7.3.2 Crack-plane orientation

7.3.3 Machining

7.3.4 Fatigue precracking

8 Procedure

8.1 Specimen measurement

8.2 Specimen test temperature

8.3 Fixture measurements for bend specimen

9 Test procedure

10 Calculation and interpretation of results

10.1 General

10.2 Residual stresses

11 Test report

Annex A (normative) Fatigue precracking of KIc fracture toughness specimens

Annex B (normative) Bend specimen

Annex C (normative) Compact specimen

Annex D (informative) Test fixtures

Bibliography