ASTM E1152-95

Test Method for Determining J-R Curves (Withdrawn 1997)

SCOPE
1.1 This test method  covers the determination of the J-integral versus crack growth resistance curves (J-R curve) for metallic materials.  
1.2 The recommended specimens are the pin-loaded compact (C(T)) and the three-point bend ( SE (B)) specimens. Both have in-plane dimensions of constant proportionality for all sizes. Specimen configurations other than those recommended in this test method may require different procedures and validity requirements.  
1.3 This test method is intended to characterize the slow, stable crack growth resistance of bend-type specimens in such a manner that it is geometry insensitive within limits set forth in this test method.  
1.4 The single specimen elastic compliance test method is detailed herein, but other techniques of measuring crack length are permissible if they equal or exceed the accuracy requirements of this test method.  
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 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.

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1994
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: E08 - Fatigue and Fracture

Standards Content (Sample)

ASTM ELL52 95 W 0759510 0568034 q8T W
AMERICAN SOCIEN FOR TESTING AND MATERIALS
Designation: E 1152 - 95 1 QI 6 Race St. Philadelphia. Pa i 91 03
Reprinted from the Annual Book of ASTM Standards Copyright ASTM
4Clb
II not listed in the current combined index, will appear in the neai editiwn.
Standard Test Method for
Determining J-R Curves'
This standard is issued under the fixed designation E I 152: the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
3.2.1 J-integral, J(FL-')-a mathematical expression, a
1. Scope
line or surface integral that encloses the crack front from one
1.1 This test method2 covers the determination of the
crack surface to the other, used to characterize the local stress
J-integral versus crack growth resistance curves (J-R curve)
strain field around the crack front. See Terminology E 616
for metallic materials.
for further discussion.
1.2 The recommended specimens are the pin-loaded com-
3.2.2 R-curve-a plot of resistance to stable crack exten-
pact (C( T)) and the three-point bend (SE( B)) specimens.
sion, Aa,,.
Both have in-plane dimensions of constant proportionality
Drscuss~o~-in this test method, the J-R curve is a plot of the
for all sizes. Specimen configurations other than those
far-field J-integral versus physical crack extension, Ao,,. It is recognized
recommended in this test method may require different
that the far-field value of J may not represent the stress-strain field local
procedures and validity requirements.
to a growing crack.
I .3 This test method is intended to characterize the slow,
3.2.3 effective yield strength, ~dFL-~]-an assumed value
stable crack growth resistance of bend-type specimens in
of uniaxial yield strength that represents the influence of
such a manner that it is geometry insensitive within limits set
plastic yielding upon fracture test parameters.
forth in this test method.
1.4 The single specimen elastic compliance test method is
Discussio~-in this test method, uy is the average of the 0.2 % offset
detailed herein, but other techniques of measuring crack tensile yield strength, um, and the ultimate tensile strength, uTS. See Test
Methods E 8.
length are permissible if they equal or exceed the accuracy
requirements of this test method.
3.2.4 specimen thickness, B[L]-distance between the
I .5 The values stated in SI units are to be regarded as the
sides of the specimen.
standard. The values given in parentheses are for informa-
3.2.5 net thickness, BdL]-distance between the roots of
tion only.
the side groove! in side grooved specimens.
1.6 This standard does not purport to address all of the
3.2.6 specimen width, W[L-distance from the reference
safety concerns, if any, associated with its use. It is the
plane to the back edge of the specimen.
responsibility of the user ofthis standard to establish appro-
3.2.7 SE(B) specimen span, S[L]-distance between spec-
priate safety and health practices and determine the applica-
imen supports.
bility of regulatory limitations prior to use.
3.2.8 physical crack size, adl]-the distance from a
reference plane to the observed crack front. The reference
2. Referenced Documents
plane depends on the specimen form. Normally it is taken to
be either a specimen boundary, or a plane containing either
2.1 ASTM Standards:
the load line or the centerline of a specimen or plate. The
E 4 Practices for Force Verification of Testing Machines3
reference plane in compact specimens is the plane normal to
E 8 Test Methods for Tension Testing of Metallic
the sides and containing the load line. In three-point bend
Materials3
specimens, it contains the notched edge of the specimen.
E 399 Test Method for Plane-Strain Fracture Toughness
3.2.9 original crack size, aJL]-the physical crack size at
of Metallic Materials3
the start of testing.
E 6 16 Terminology Relating to Fracture Testing3
3.2.1 O original uncracked ligament, bdL]-distance from
E 8 13 Test Method for .IIc, A Measure of Fracture Tough-
the original crack front to the back edge of the specimen (b,
ness3
= W - ao).
3.2.1 1 physical crack extension, AaJL]-an increase in
3. Terminology
(Aa,, = a,, - ao).
physical crack size
3.1 Terminology related to fracture testing contained in
3.2.12 remaining ligament, b[L]-distance from the phys-
Terminology E 6 I6 is applicable to this test method.
ical crack front to the back edge of the specimen (6 = W -
3.2 Definitions:
Up).
4. Summary of Test Method
'This test method is under the jurisdiction of ASTM Committee E-8 on
4.1 This test method describes a single specimen tech-
Fatique and Fracture and is the direct responsibility of Subcommittee E 08.08 on
nique of determining the J-R curve
...