ASTM E813-89E01

Test Method for JIC, A Measure of Fracture Toughness (Withdrawn 1997)

SCOPE
1.1 This test method covers the determination of JIc , which can be used as an engineering estimate of fracture toughness near the initiation of slow stable crack growth for metallic materials. It applies specifically to geometries that contain notches and flaws and that are sharpened with fatigue cracks. The recommended specimens are generally bend type that contain deep initial cracks. The loading rate is slow and environmentally assisted cracking is assumed to be negligible.  
1.1.1 The recommended three-point bend specimen [ SE ( )] is a single edge-cracked beam having an initial normalized crack length, ao/W , of 0.5 to 0.75. Overall span-to-width ratio, S/W is set at 4.  
1.1.2 The recommended compact specimen is the standard compact specimen [ ( )] that is pin-loaded in tension. The specimen configuration has fixed planar dimensional proportionality with an initial normalized crack length, ao/W of 0.5 to 0.75.  
1.1.3 Specimen dimension requirements are based upon the ratio of J-integral to material effective yield strength. Therefore, in specimen design, it is helpful to have a general idea of the expected results in advance.  
1.1.4 Specimen configurations other than those recommended in this test method may involve different validity requirements than those presently specified in this method.  
1.2 Values stated in SI units are to be regarded as the standard. Inch-pound values are given in parentheses for information only.  
1.3 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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• Status: Withdrawn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-1988
• Technical Committee: E08 - Fatigue and Fracture

Standards Content (Sample)

ASTM EB33*E3 89 W 0759530 007bl127 B
~ ~~~~ -~
(i[)) Designation: E 813 - 89''
Standard Test Method for
JIc, A Measure of Fracture Toughness'
This standard is issued under the fixed designation E 813; 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.
1991.
NOTE-Editorid correctioins were made in Apd
1. Scope E 399 Test Method for Plane-Strain Fracture Toughness
of Metallic Materials2
1.1 This test method covers the determination of JI,
E 616 Terminology Relating to Fracture Testing2
which can be used as an engineering estimate of fracture
E 1152 Test Method for Determining J-R Curves2
toughness near the initiation of slow stable crack growth for
metallic materials. It applies specifically to geometries that
3. Terminology
contain notches and flaws and that are sharpened with
3.1 Terminology E 616 is applicable to this test method.
fatigue cracks. The recommended specimens are generally
3.2 Definitions:
bend type that contain deep initial cracks. The loading rate is
3.2.1 J-integral, J(FL1)-a mathematical expression, a
slow and environmentally assisted cracking is assumed to be
negligible. line or surface integral that encloses the crack front from one
1.1.1 The recommended three-point bend specimen crack surface to the other, used to characterize the local
[SE(B)] is a single edge-cracked beam having an initial stress-strain field around the crack front. (See Terminology
0.5 to 0.75. Overall E 6 16 for further discussion.)
normalized crack length, aJW, of
span-to-width ratio, S/Wis set at 4.
NOTE-& is a critical value of J near the onset of stable crack
1.1.2 The recommended compact specimen is the
extension as specified in this test method.
standard compact specimen [C(T)] that is pin-loaded in
3.2.2 J-R curve-a plot of resistance to stable crack
tension. The specimen configuration has fixed planar dimen-
extension, Asp.
sional proportionality with an initial normalized crack
Discussion-In this test method, the J-R curve is a plot of
0.5 to 0.75.
length, adW of
the J-integral versus physical crack extension, Aa,.
1.1.3 Specimen dimension requirements are based upon
3.2.3 effective yield strength, ~~[FL-~l-an assumed
the ratio of J-integral to material effective yield strength,
value of uniaxial yield strength that represents the influence
Therefore, in specimen design, it is helpful to have a general
of plastic yielding upon fracture test parameters.
idea of the expected results in advance.
Discussion-In this test method, uy is the average of the
1.1.4 Specimen configurations other than those recom-
0.2 % offset tensile yield strength, uYs, and the ultimate
mended in this test method may involve different validity
tensile strength, 03.
requirements than those presently specified in this method.
3.2.4 specimen thickness, B[L]-distance between the
1.2 Values stated in SI units are to be regarded as the
sides of the specimen.
standard. Inch-pound values are given in parentheses for
3.2.5 net thickness, BA{L]-distance between the roots of
information only,
the side grooves in side grooved specimens.
1.3 This standard may involve hazardous materials, oper-
3.2.6 effective thickness BJL]-for compliance-based ex-
ations, and equipment. This standard does not purport to
tension measurements Be = B - (B - BN12/B.
address all of the safety problems associated with its use. It is
3.2.7 specimen width, W[L]-distance from the reference
the responsibility of the user of this standard to establish
plane to the back surface of the specimen. The reference
appropriate safety and health practices and determine the
plane depends on the specimen form. Normally it is taken to
applicability of regulatory limitations prior to use.
be either a specimen boundary, or a plane containing either
the load line or the centerline of a specimen or plate. The
2. Referenced Documents
reference plane in compact specimens is the plane normal to
the sides and containing the load line. In three-point bend
2,l ASTM Standards:
specimens, it contains the notched edge of the specimen.
E 4 Practices for Load Verification of Testing Machines2
3.2.8 specimen span, S[L]-distance between specimen
E 8 Test Methods of Tension Testing of Metallic
supports in a bend specimen.'
Materials2
3.2.9 physical crack size, adl]-the distance from the
reference plane to the observed crack front.
3.2.10 original crack size, adL]-the physical crack size
1 This test method is under the jurisdiction of ASTM Committee E-24 on
Fracture Testing and is the direct responsibility of Subcommittee E24.08 on
at the start of testing.
Elastic-Plastic and Fully Plastic Fracture Mechanics Terminology.
3.2.1 1 original uncracked ligament, bdL]-d
...