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ASTM E1304-97

Historical Revision

Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials

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1.1 This test method covers the determination of plane-strain (chevron-notch) fracture toughnesses, KIv or K IvM, of metallic materials. Fracture toughness by this method is relative to a slowly advancing steady state crack initiated at a chevron-shaped notch, and propagating in a chevron-shaped ligament (Fig. 1). Some metallic materials, when tested by this method, exhibit a sporadic crack growth in which the crack front remains nearly stationary until a critical load is reached. The crack then becomes unstable and suddenly advances at high speed to the next arrest point. For these materials, this test method covers the determination of the plane-strain fracture toughness, KIvj or KIvM, relative to the crack at the points of instability.

Note 1—One difference between this test method and Test Method E 399 (which measures K Ic) is that Test Method E 399 centers attention on the start of crack extension from a fatigue precrack. This test method makes use of either a steady state slowly propagating crack, or a crack at the initiation of a crack jump. Although both methods are based on the principles of linear elastic fracture mechanics, this difference, plus other differences in test procedure, may cause the values from this test method to be larger than KIc values in some materials. Therefore, toughness values determined by this test method cannot be used interchangeably with KIc.

1.2 This test method uses either chevron-notched rod specimens of circular cross section, or chevron-notched bar specimens of square or rectangular cross section (Figs. 1-10). The terms "short rod" and "short bar" are used commonly for these types of chevron-notched specimens.

1.3 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 E1304
Publication Date April 10, 1997
Language en - English
Page Count 11
Revision Level 97
Supercedes
Committee E08.02
Publish Date Document Id Type View
July 1, 2014 E1304-97R14E01 Revision
Nov. 1, 2008 E1304-97R08E01 Revision
April 10, 1997 E1304-97R02 Revision
April 10, 1997 E1304-97 Revision
May 15, 2020 E1304-97R20 Reaffirmation
July 1, 2014 E1304-97R14 Reaffirmation
Nov. 1, 2008 E1304-97R08 Reaffirmation