ASTM-E1221 › Historical Revision Information
Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels
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Scope
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.
Keywords
plane-strain; side grooved
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03.01 (Metals -- Mechanical Testing; Elevated and Low-Temperature Tests; Metallography)
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Document Number
ASTM-E1221-12AR18E01
Revision Level
2012A R18(E1) EDITION
Status
Superseded
Modification Type
Revision
Publication Date
May 15, 2020
Document Type
Test Method
Page Count
20 pages
Committee Number
E08.07