What is ISO 20064- Determination of brittle crack arrest toughness in metallic materials about?
ISO 20064 is a safety standard on the method of test for the determination of brittle crack arrest toughness, Kca.
ISO 20064 specifies a test method for the determination of brittle crack arrest toughness. ISO 20064 is applicable to ferritic steel base metals exhibiting ductile to brittle transition behaviour. Applicable materials are rolled steel plates.
ISO 20064 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. ISO 20064 can be applied to flat-rolled steel plates but not too flattened steel pipes because the flattening can cause changes in arrest toughness.
Who is ISO 20064- Determination of brittle crack arrest toughness in metallic materials?
ISO 20064 on the method of test for the determination of brittle crack arrest toughness, Kca is relevant to:
- Metallurgical engineers
- Testing authorities
- Shipbuilding steel industries
- Manufacturers of test machines and impact equipment
Why should you use ISO 20064- Determination of brittle crack arrest toughness in metallic materials?
The wide plate crack arrest test is intended to evaluate the arrest toughness, Kca, of steel plate at its thickness of actual use and not the lower bound arrest toughness, KIa.
ISO 20064 provides a test method for determining the crack arrest toughness of steels. ISO 20064 provides a test method for the determination of brittle crack arrest toughness of steel by using wide plates with a temperature gradient. Annex A describes typical devices and a method of setting the temperature gradient on the piece. To determine Kca at a specific temperature, such as the design temperature of a structure, the method specified in Annex B is applicable. The method described in Annex C can be used to determine the stress intensity factor for a curved crack, to check the validity of a crack propagation path. As a method for initiating a brittle crack, a secondary loading mechanism can be used.
Overall, ISO 20064 is useful as it provides specifications for the testing machine needed for conducting the test. ISO 20064 assists the user in using the test machine that applies a tensile force to an integrated test piece and the impact equipment which is used to initiate a brittle crack on the test piece.