ASTM E1290-07e1
(Test Method)Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
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 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.
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.
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Designation: E 1290 – 07
Standard Test Method for
Crack-Tip Opening Displacement (CTOD) Fracture
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Toughness Measurement
This standard is issued under the fixed designation E1290; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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e NOTE—Editorial changes made throughout in November 2007.
1. Scope to outer tube radius. For an inner radius, r , to an outer radius,
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r , ratio of > 0.6 to 1.0, a span to width ratio, S/W, of 4 may be
1.1 This test method covers the determination of critical 2
used. For r /r ratios from 0.4 to 0.6, an S/W of 3 may be used.
1 2
crack-tip opening displacement (CTOD) values at one or more
1.2 This standard does not purport to address all of the
of several crack extension events. These CTOD values can be
safety concerns, if any, associated with its use. It is the
used as measures of fracture toughness for metallic materials,
responsibility of the user of this standard to establish appro-
andareespeciallyappropriatetomaterialsthatexhibitachange
priate safety and health practices and determine the applica-
from ductile to brittle behavior with decreasing temperature.
bility of regulatory limitations prior to use.
This test method applies specifically to notched specimens
sharpened by fatigue cracking. The recommended specimens
2. Referenced Documents
are three-point bend [SE(B)] compact [C(T)], or arc-shaped
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2.1 ASTM Standards:
bend[A(B)]specimens.Theloadingrateisslowandinfluences
E4 Practices for Force Verification of Testing Machines
of environment (other than temperature) are not covered. The
E8 Test Methods for Tension Testing of Metallic Materials
specimensaretestedundercrossheadorclipgagedisplacement
E399 Test Method for Plane-Strain Fracture Toughness of
controlled loading.
Metallic Materials
1.1.1 The recommended specimen thickness, B, for the
E1820 Test Method for Measurement of Fracture Tough-
SE(B)andC(T)specimensisthatofthematerialinthicknesses
ness
intended for an application. For the A(B) specimen, the
E1823 Terminology Relating to Fatigue and Fracture
recommended depth, W, is the wall thickness of the tube or
Testing
pipe from which the specimen is obtained. Superficial surface
machining may be used when desired.
3. Terminology
1.1.2 For the recommended three-point bend specimens
3.1 Terminology E1823 is applicable to this test method.
[SE(B)], width, W, is either equal to, or twice, the specimen
3.2 Definitions:
thickness, B, depending upon the application of the test. (See
3.2.1 crack tip opening displacement, (CTOD), d[L]—the
4.3 for applications of the recommended specimens.) For
crack displacement due to elastic and plastic deformation at
SE(B) specimens the recommended initial normalized crack
variously defined locations near the original (prior to an
size is 0.45# a /W# 0.70. The span-to-width ratio (S/W)is
o
application of force) crack tip.
specified as 4.
3.2.1.1 Discussion—In this test method, CTOD is the dis-
1.1.3 For the recommended compact specimen [C(T)] the
placement of the crack surfaces normal to the original (un-
initial normalized crack size is 0.45 # a /W # 0.70. The
o
loaded) crack plane at the tip of the fatigue precrack, a .
o
half-height-to-width ratio (H/W) equals 0.6 and the width to
thickness ratio W/B is specified to be 2.
InCTODtesting, d [L]isthevalueofCTODattheonsetofunstable
c
brittlecrackextension(see3.2.13)orpop-in(see3.2.7)when Da <0.2
1.1.4 For the recommended arc-shaped bend [A(B)] speci-
p
mm (0.008 in.). The force P and the clip gage displacement v , for d
men, B is one-half the specimen depth, W. The initial normal- c c c
are indicated in Fig. 1.
ized crack size is 0.45 < a /W< 0.70. The span to width ratio,
o
InCTODtesting, d [L]isthevalueofCTODattheonsetofunstable
u
S/W, may be either 3 or 4 depending on the ratio of the inner
brittlecrackextension(see3.2.13)orpop-in(see3.2.7)whentheevent
isprecededby Da >0.2mm(0.008in.).Theforce P andtheclipgage
p u
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This test method is under the jurisdiction ofASTM Committee E08 on Fatigue
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and Fracture and is the direct responsibility of Subcommittee E08.07 on Fracture For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Mechanics. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved July 15, 2007. Published August 2007. Originally Standards volume information, refer to the standard’s Document Summary page on
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published in 1989. Last previous edition published in 2002 as E1290–02 . the ASTM website.
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