ASTM E1681-23e1
(Test Method)Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
SIGNIFICANCE AND USE
5.1 The parameters KEAC or KIEAC determined by this test method characterize the resistance to crack growth of a material with a sharp crack in specific environments under loading conditions in which the crack-tip plastic region is small compared with the crack depth and the uncracked ligament. The less restrictive thickness requirements of KEAC are intended for those conditions in which the results are a strong function of the thickness of the specimen and the application requires the testing of specimens with thickness representative of the application. Since the chemical and mechanical influences cannot be separated, in some material/environment combinations, the thickness must be treated as a variable. A KEAC or KIEAC value is believed to represent a characteristic measurement of environment-assisted cracking resistance in a precracked specimen exposed to an environment under sustained tensile loading. A KEAC or KIEAC value may be used to estimate the relationship between failure stress and defect size for a material under any service condition, where the combination of crack-like defects, sustained tensile loading and the same specific environment would be expected to occur. (Background information concerning the development of this test method can be found in Refs (3-18).
5.1.1 The apparent KEAC or KIEAC of a material under a given set of chemical and electrochemical environmental conditions is a function of the test duration. It is difficult to furnish a rigorous and scientific proof for the existence of a threshold (4, 5). Therefore, application of KEAC or KIEAC data in the design of service components should be made with awareness of the uncertainty inherent in the concept of a true threshold for environment-assisted cracking in metallic materials (6, 18). A measured KEAC or KIEAC value for a particular combination of material and environment may, in fact, represent an acceptably low rate of crack growth rather than an absolute upper limit f...
SCOPE
1.1 This test method covers the determination of the environment-assisted cracking threshold stress intensity factor parameters, KIEAC and KEAC, for metallic materials from constant-force testing of fatigue precracked beam or compact fracture specimens and from constant-displacement testing of fatigue precracked bolt-load compact fracture specimens.
1.2 This test method is applicable to environment-assisted cracking in aqueous or other aggressive environments.
1.3 Materials that can be tested by this test method are not limited by thickness or by strength as long as specimens are of sufficient thickness and planar size to meet the size requirements of this test method.
1.4 A range of specimen sizes with proportional planar dimensions is provided, but size may be variable and adjusted for yield strength and applied force. Specimen thickness is a variable independent of planar size.
1.5 Specimen configurations other than those contained in this test method may be used, provided that well-established stress intensity calibrations are available and that specimen dimensions are of sufficient size to meet the size requirements of this test method during testing.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation: E1681 − 23
Standard Test Method for
Determining Threshold Stress Intensity Factor for
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Environment-Assisted Cracking of Metallic Materials
This standard is issued under the fixed designation E1681; 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 (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—Section 3.1.9 was editorially corrected in April 2024.
1. Scope 2. Referenced Documents
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1.1 This test method covers the determination of the 2.1 ASTM Standards:
environment-assisted cracking threshold stress intensity factor D1141 Practice for Preparation of Substitute Ocean Water
parameters, K and K , for metallic materials from E8/E8M Test Methods for Tension Testing of Metallic Ma-
IEAC EAC
constant-force testing of fatigue precracked beam or compact terials
fracture specimens and from constant-displacement testing of E399 Test Method for Linear-Elastic Plane-Strain Fracture
fatigue precracked bolt-load compact fracture specimens. Toughness of Metallic Materials
E647 Test Method for Measurement of Fatigue Crack
1.2 This test method is applicable to environment-assisted
Growth Rates
cracking in aqueous or other aggressive environments.
E1823 Terminology Relating to Fatigue and Fracture Testing
1.3 Materials that can be tested by this test method are not
G1 Practice for Preparing, Cleaning, and Evaluating Corro-
limited by thickness or by strength as long as specimens are of
sion Test Specimens
sufficient thickness and planar size to meet the size require-
G5 Reference Test Method for Making Potentiodynamic
ments of this test method.
Anodic Polarization Measurements
1.4 A range of specimen sizes with proportional planar G15 Terminology Relating to Corrosion and Corrosion Test-
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ing (Withdrawn 2010)
dimensions is provided, but size may be variable and adjusted
for yield strength and applied force. Specimen thickness is a
3. Terminology
variable independent of planar size.
1.5 Specimen configurations other than those contained in 3.1 Definitions:
this test method may be used, provided that well-established 3.1.1 For definitions of terms relating to fracture testing
stress intensity calibrations are available and that specimen used in this test method, refer to Terminology E1823.
dimensions are of sufficient size to meet the size requirements 3.1.2 For definitions of terms relating to corrosion testing
of this test method during testing. used in this test method, refer to Terminology G15.
3.1.3 stress-corrosion cracking (SCC)—a cracking process
1.6 This standard does not purport to address all of the
that requires the simultaneous action of a corrodent and
safety concerns, if any, associated with its use. It is the
sustained tensile stress.
responsibility of the user of this standard to establish appro-
3.1.4 stress intensity factor threshold for plane strain
priate safety, health, and environmental practices and deter-
–3/2
mine the applicability of regulatory limitations prior to use. environment-assisted cracking (K [FL ])—the highest
IEAC
value of the stress intensity factor (K) at which crack growth is
1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard- not observed for a specified combination of material and
environment and where the specimen size is sufficient to meet
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- requirements for plane strain as described in Test Method
E399.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
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This test method is under the jurisdiction of ASTM Committee E08 on Fatigue For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and Fracture and is the direct responsibility of Subcommittee E08.06 on Crack contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Growth Behavior. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved May 1, 2023. Published June 2023. Originally the ASTM website.
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approved in 1995. Last previous edition approved in 2020 as E1681 - 03(2020). The last approved version of this historical standard is referenced on
DOI: 10.1520/E1681-23E01. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E1681 − 23
3.1.5 stress intens
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