ISO 20064:2019
Metallic materials — Steel — Method of test for the determination of brittle crack arrest toughness, Kca
This document specifies a test method for the determination of brittle crack arrest toughness.
It is applicable to ferritic steel base metals exhibiting ductile to brittle transition behaviour. Applicable materials are rolled steel plates. It is intended for materials with a tensile strength of 950 MPa or less and a test piece thickness of 200 mm or less. The range of arrest temperatures is between −196 °C and +100 °C. This document can be applied to flat rolled steel plates but not to flattened steel pipes because the flattening can cause changes in arrest toughness.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Test equipment
5.1 General
5.2 Testing machine
5.2.1 Force implementation
5.2.2 Calibration of the load cell
5.2.3 Force measurement
5.2.4 Method for force transfer to integrated test piece
5.2.5 Loading direction
5.2.6 Distance between the loading pins
5.3 Impact equipment
5.3.1 Impact methods
5.3.2 Impact energy calculation
5.3.3 Reaction force receivers
6 Test pieces
6.1 Test piece configurations
6.2 Configurations of extension plates and tab plates
6.2.1 General
6.2.2 Extension plates
6.2.3 Tab plates
6.3 Welding of test piece and extension plates
7 Test methods
7.1 Temperature control method
7.1.1 Determination of temperature gradient
7.1.2 Method of temperature control and monitoring
7.2 Crack initiation methods
8 Test procedures
8.1 Pretest procedures
8.2 Impacting procedures
8.3 Post-test operations
8.4 Observation of fracture surfaces
9 Determination of arrest toughness
9.1 Validation of arrested crack
9.2 Assessment of impact energy
9.3 Calculation of arrest toughness
10 Reporting
Annex A (informative) Devices and method for controlling and monitoring the temperature of test pieces
Annex B (normative) Method for obtaining Kca at a specific temperature
Annex C (normative) Calculation of stress intensity factors for a curved crack
Annex D (informative) Double tension type arrest test
Annex E (informative) Duplex type arrest test
Annex F (informative) Dynamic measurement methods
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Test equipment
5.1 General
5.2 Testing machine
5.2.1 Force implementation
5.2.2 Calibration of the load cell
5.2.3 Force measurement
5.2.4 Method for force transfer to integrated test piece
5.2.5 Loading direction
5.2.6 Distance between the loading pins
5.3 Impact equipment
5.3.1 Impact methods
5.3.2 Impact energy calculation
5.3.3 Reaction force receivers
6 Test pieces
6.1 Test piece configurations
6.2 Configurations of extension plates and tab plates
6.2.1 General
6.2.2 Extension plates
6.2.3 Tab plates
6.3 Welding of test piece and extension plates
7 Test methods
7.1 Temperature control method
7.1.1 Determination of temperature gradient
7.1.2 Method of temperature control and monitoring
7.2 Crack initiation methods
8 Test procedures
8.1 Pretest procedures
8.2 Impacting procedures
8.3 Post-test operations
8.4 Observation of fracture surfaces
9 Determination of arrest toughness
9.1 Validation of arrested crack
9.2 Assessment of impact energy
9.3 Calculation of arrest toughness
10 Reporting
Annex A (informative) Devices and method for controlling and monitoring the temperature of test pieces
Annex B (normative) Method for obtaining Kca at a specific temperature
Annex C (normative) Calculation of stress intensity factors for a curved crack
Annex D (informative) Double tension type arrest test
Annex E (informative) Duplex type arrest test
Annex F (informative) Dynamic measurement methods
Bibliography