ASTM International - ASTM E1290-02e1

Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement

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Organization: ASTM International
Publication Date: 10 December 2002
Status: historical
Page Count: 13
ICS Code (Mechanical testing of metals): 77.040.10
scope:

1.1 This test method covers the determination of critical crack-tip opening displacement (CTOD) values at one or more of several crack extension events. These CTOD values can be used as measures of fracture toughness for metallic materials, and are especially appropriate to materials that exhibit a change from ductile to brittle behavior with decreasing temperature. This test method applies specifically to notched specimens sharpened by fatigue cracking. The recommended specimens are three-point bend [SE(B)] compact [C(T)], or arc-shaped bend [A(B)] specimens. The loading rate is slow and influences of environment (other than temperature) are not covered. The specimens are tested under crosshead or clip gage displacement controlled loading.

1.1.1 The recommended specimen thickness, B, for the SE(B) and C(T) specimens is that of the material in thicknesses intended for an application. For the A(B) specimen, the recommended depth, W, is the wall thickness of the tube or pipe from which the specimen is obtained. Superficial surface machining may be used when desired.

1.1.2 For the recommended three-point bend specimens [SE(B)], width, W, is either equal to, or twice, the specimen thickness, B, depending upon the application of the test. (See 4.3 for applications of the recommended specimens.) For SE(B) specimens the recommended initial normalized crack size is 0.45 ≤ ao/W 0.70. The span-to-width ratio ( S/W) is specified as 4.

1.1.3 For the recommended compact specimen [C(T)] the initial normalized crack size is 0.45 ≤ ao/W 0.70. The half-height-to-width ratio (H/W) equals 0.6 and the width to thickness ratio W/ B is specified to be 2.

1.1.4 For the recommended arc-shaped bend [A(B)] specimen, B is one-half the specimen depth, W. The initial normalized crack size is 0.45 < ao/W 0.70. The span to width ratio, S/W, may be either 3 or 4 depending on the ratio of the inner to outer tube radius. For an inner radius, r1, to an outer radius, r2, ratio of > 0.6 to 1.0, a span to width ratio, S/W, of 4 may be used. For r 1/r2 ratios from 0.4 to 0.6, an S/W of 3 may be used.

1.2 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.

Document History

April 1, 2008
Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
1.1 This test method covers the determination of critical crack-tip opening displacement (CTOD) values at one or more of several crack extension events, and may be used to measure cleavage crack...
April 1, 2008
Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement (Withdrawn 2013)
1.1 This test method covers the determination of critical crack-tip opening displacement (CTOD) values at one or more of several crack extension events, and may be used to measure cleavage crack...
July 15, 2007
Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
1.1 This test method covers the determination of critical crack-tip opening displacement (CTOD) values at one or more of several crack extension events. These CTOD values can be used as measures of...
July 15, 2007
Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
1.1 This test method covers the determination of critical crack-tip opening displacement (CTOD) values at one or more of several crack extension events. These CTOD values can be used as measures of...
December 10, 2002
Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
1.1 This test method covers the determination of critical crack-tip opening displacement (CTOD) values at one or more of several crack extension events. These CTOD values can be used as measures of...
ASTM E1290-02e1
December 10, 2002
Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
1.1 This test method covers the determination of critical crack-tip opening displacement (CTOD) values at one or more of several crack extension events. These CTOD values can be used as measures of...
June 10, 1999
Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
1.1 This test method covers the determination of critical crack-tip opening displacement (CTOD) values at one or more of several crack extension events. These CTOD values can be used as measures of...
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