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ASTM E1290

2008 Edition, April 1, 2008

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

Includes all amendments and changes through Editorial Change 1, March 2010


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Product Details:

  • Revision: 2008 Edition, April 1, 2008
  • Published Date: March 2010
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 15
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

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 initiation toughness for materials that exhibit a change from ductile to brittle behavior with decreasing temperature, such as ferritic steels. 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.

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.

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 less than or equal to ao/W less than or equal to 0.70. The span-to-width ratio (S/W) is specified as 4.

For the recommended compact specimen [C(T)] the initial normalized crack size is 0.45 less than or eual to ao/W less than or equal to 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.

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 less than ao/W less than 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 greater than 0.6 to 1.0, a span to width ratio, S/W, of 4 may be used. For r1/r2 ratios from 0.4 to 0.6, an S/W of 3 may be used.

The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

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.