ASTM E1221-12a
Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels

Standard No.

ASTM E1221-12a

Release Date

2012

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E1221-12a(2018)

Latest

ASTM E1221-23

Scope

5.1 In structures containing gradients in either toughness or stress, a crack may initiate in a region of either low toughness or high stress, or both, and arrest in another region of either higher toughness or lower stress, or both. The value of the stress intensity factor during the short time interval in which a fast-running crack arrests is a measure of the ability of the material to arrest such a crack. Values of the stress intensity factor of this kind, which are determined using dynamic methods of analysis, provide a value for the crack-arrest fracture toughness which will be termed K_A in this discussion. Static methods of analysis, which are much less complex, can often be used to determine K at a short time (1 to 2 ms) after crack arrest. The estimate of the crack-arrest fracture toughness obtained in this fashion is termed K _a. When macroscopic dynamic effects are relatively small, the difference between K_A and K_a is also small (1-4). For cracks propagating under conditions of crack-front plane-strain, in situations where the dynamic effects are also known to be small, K_Ia determinations using laboratory-sized specimens have been used successfully to estimate whether, and at what point, a crack will arrest in a structure (5, 6). Depending upon component design, loading compliance, and the crack jump length, a dynamic analysis of a fast-running crack propagation event may be necessary in order to predict whether crack arrest will occur and the arrest position. In such cases, values of K _Ia determined by this test method can be used to identify those values of K below which the crack speed is zero. More details on the use of dynamic analyses can be found in Ref (4).

5.2 This test method can serve at least the following additional purposes:

5.2.1 In materials research and development, to establish in quantitative terms significant to service performance, the effects of metallurgical variables (such as composition or heat treatment) or fabrication operations (such as welding or forming) on the abi......

ASTM E1221-12a Referenced Document

• ASTM E1304 Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials
• ASTM E1823 Standard Terminology Relating to Fatigue and Fracture Testing
• ASTM E208 Standard Test Method for Conducting Drop-Weight Test to Determine Nil-Ductility Transition Temperature of Ferritic Steels
• ASTM E23 Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
• ASTM E399 Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials
• ASTM E616 
• ASTM E8 Standard Test Methods for Tension Testing of Metallic Materials

ASTM E1221-12a history

• 2023 ASTM E1221-23 Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels
• 2018 ASTM E1221-12a(2018) Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels
• 2012 ASTM E1221-12a Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels
• 2018 ASTM E1221-12A(2018)e1 Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels
• 2012 ASTM E1221-12 Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels
• 2010 ASTM E1221-10 Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, K_Ia, of Ferritic Steels
• 2006 ASTM E1221-06 Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, K_Ia, of Ferritic Steels
• 1996 ASTM E1221-96(2002) Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, K_Ia, of Ferritic Steels
• 1996 ASTM E1221-96 Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, K_Ia, of Ferritic Steels