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ASTM E1221-96

Historical Revision

Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, <emph type="bdit">K<inf>Ia</inf></emph>, of Ferritic Steels

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1.1 This test method employs a side-grooved, crack-line-wedge-loaded specimen to obtain a rapid run-arrest segment of flat-tensile separation with a nearly straight crack front. This test method provides a static analysis determination of the stress intensity factor at a short time after crack arrest. The estimate is denoted K a. When certain size requirements are met, the test result provides an estimate, termed KIa, of the plane-strain crack-arrest toughness of the material.

1.2 The specimen size requirements, discussed later, provide for in-plane dimensions large enough to allow the specimen to be modeled by linear elastic analysis. For conditions of plane-strain, a minimum specimen thickness is also required. Both requirements depend upon the crack arrest toughness and the yield strength of the material. A range of specimen sizes may therefore be needed, as specified in this test method.

1.3 If the specimen does not exhibit rapid crack propagation and arrest, Ka cannot be determined.

1.4 Values stated in inch-pound units are to be regarded as the standards. SI units are provided for information only.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


SDO ASTM: ASTM International
Document Number E1221
Publication Date June 10, 1996
Language en - English
Page Count 17
Revision Level 96
Supercedes
Committee E08.07
Publish Date Document Id Type View
Nov. 1, 2023 E1221-23 Revision
Nov. 1, 2018 E1221-12AR18E01 Revision
Nov. 1, 2012 E1221-12A Revision
May 1, 2012 E1221-12 Revision
Nov. 1, 2010 E1221-10 Revision
Jan. 15, 2006 E1221-06 Revision
June 10, 1996 E1221-96 Revision
Nov. 1, 2018 E1221-12AR18 Reaffirmation
June 10, 1996 E1221-96R02 Reaffirmation