ASTM E468-90(2004)e1
(Practice)Standard Practice for Presentation of Constant Amplitude Fatigue Test Results for Metallic Materials
Standard Practice for Presentation of Constant Amplitude Fatigue Test Results for Metallic Materials
SCOPE
1.1 This practice covers the desirable and minimum information to be communicated between the originator and the user of data derived from constant-force amplitude axial, bending, or torsion fatigue tests of metallic materials tested in air and at room temperature.
Note 1—Practice E 466, although not directly referenced in the text, is considered important enough to be listed in this standard.
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Designation:E468–90(Reapproved 2004)
Standard Practice for
Presentation of Constant Amplitude Fatigue Test Results for
Metallic Materials
This standard is issued under the fixed designation E468; 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 (´) indicates an editorial change since the last revision or reapproval.
´ NOTE—Editorial changes were made throughout in October 2004.
1. Scope 3. Terminology Definitions and Nomenclature
1.1 This practice covers the desirable and minimum infor- 3.1 The terms and abbreviations used in this practice are
mationtobecommunicatedbetweentheoriginatorandtheuser defined in Terminology E6 and in Definitions E206. In addi-
of data derived from constant-force amplitude axial, bending, tion, the following nomenclature is used:
or torsion fatigue tests of metallic materials tested in air and at 3.2 criterion of failure—complete separation, or the pres-
room temperature. ence of a crack of specified length visible at a specified
magnification.Othercriteriamaybeusedbutshouldbeclearly
NOTE 1—Practice E466, although not directly referenced in the text, is
defined.
considered important enough to be listed in this standard.
3.3 run-out—no failure at a specified number of loading
2. Referenced Documents cycles.
2.1 ASTM Standards:
4. Significance and Use
E6 TerminologyRelatingtoMethodsofMechanicalTesting
4.1 Fatigue test results may be significantly influenced by
E8/E8M Test Methods for Tension Testing of Metallic
thepropertiesandhistoryoftheparentmaterial,theoperations
Materials
performedduringthepreparationofthefatiguespecimens,and
E206 Definitions of Terms Relating to Fatigue Testing and
the testing machine and test procedures used during the
the Statistical Analysis of Fatigue Data
generation of the data. The presentation of fatigue test results
E466 Practice for Conducting Force Controlled Constant
should include citation of basic information on the material,
Amplitude Axial Fatigue Tests of Metallic Materials
specimens, and testing to increase the utility of the results and
E467 Practice for Verification of Constant Amplitude Dy-
to reduce to a minimum the possibility of misinterpretation or
namic Forces in an Axial Fatigue Testing System
improper application of those results.
2.2 Special Technical Publications:
STP91 A Guide for Fatigue Testing and the Statistical
5. Listing of Basic Information About Fatigue Test
Analysis of Fatigue Data
Specimen
STP588 Manual on Statistical Planning and Analysis
5.1 Specification and Properties of Material:
5.1.1 Material Prior to Fatigue Test Specimen
ThispracticeisunderthejurisdictionofASTMCommitteeE08onFatigueand
Preparation—The minimum information to be presented
Fracture and is the direct responsibility of Subcommittee E08.05 on Cyclic
should include the designation or specification (for example,
Deformation and Fatigue Crack Formation.
A441, SAE 1070, and so forth) or proprietary grade; form of
Current edition approved May 1, 2004. Published June 2004. Originally
approved in 1972. Last previous edition approved in 1998 as E468—90 (1998).
product (for example, plate, bar, casting, and so forth); heat
DOI: 10.1520/E0468-90R04E01.
number; melting practice; last mechanical working and last
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
heat treatment that produced the material in the “as-received”
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
condition (for example, cold-worked and aged, annealed and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
rolled, and so forth); chemical composition; and surface
Withdrawn. The last approved version of this historical standard is referenced
condition (for example, rolled and descaled, ground, and so
on www.astm.org.
forth).
AGuide for Fatigue Testing and the StatisticalAnalysis of Fatigue Data,ASTM
STP 91 A, ASTM International, 1963. Out of print; available from University
Micro- films, Inc., 300 N. Zeeb Rd., Ann Arbor, MI 48106.
Manual on Statistical Planning and Analysis, ASTM STP 588, ASTM Interna-
tional, 1975.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E468–90 (2004)
5.1.1.1 It is desirable but not required (unless by mutual specimens were stored, type of protection applied to the
consent of the originator and user of the data) to list the raw specimens, and method used to remove that protection. It is
material production sequence, billet preparation, results of desirable but not required to list the average and range of
cleanliness analysis, or a combination thereof, when appli- surface roughness, surface hardness, out-of-flatness, out-of-
cable. straightnessorwarpage,oracombinationthereof,ofallfatigue
specimens.
5.1.2 Material in the Fatigue Test Specimen:
5.1.2.1 Mechanical Properties—The minimum data on the
6. Listing of Information on Test Procedures
mechanicalpropertiesofthematerialinaconditionidenticalto
6.1 Design of the Fatigue Test Program:
that of the fatigue test specimen should include the tensile
6.1.1 Ifstatisticaltechniqueswereusedtodesignthefatigue
strength, yield point or yield strength at a specified onset;
test program, the design plan and list of statistical techniques
elongation in a specified gage length; reduction of area when
(for example, randomization of test sequence, blocking, etc.)
applicable; and the designation of the test used to procure the
used to accommodate expected or observed heterogeneities
mechanical properties (for example, Test Methods E8/E8M,
should be presented. Statistical techniques are described in
TensionTestingofMetallicMaterials,andsoforth).Ifnotched
STP91 and STP588.
fatigue tests were conducted, the notched tensile strength also
6.2 Fatigue Testing Machine:
should be listed.
6.2.1 Minimum information to be presented should include
5.1.2.2 Metallography—It is desirable but not required
the type of testing machine, the functional characteristic (for
(unless by mutual consent of the originator and user of the
example,electrohydraulic,crankandlever,rotatingmass,etc.),
data) to list the grain size (when applicable), phases, and
frequency of force application, and forcing function (for
dispersions characteristic of the fatigue test specimen in the
example, sine, square, etc.). If tests were performed on more
“ready-to-test” condition.
thanonemachine,thenumberoftestingmachinesusedshould
5.1.2.3 It is desirable but not required (unless by mutual
be listed.
consent of the originator and user of the data) to show the
6.2.2 Minimum information should include the method of
locations, in the parent material, from which the specimens
dynamic force verification and force monitoring procedures.
were taken.
5.2 Minimum Information to Be Presented on Design of
NOTE 2—For guidance on axial force machines, refer to Practice E467.
Fatigue Test Specimen in the “Ready-To-Test” Conditions:
6.3 Fatigue Test:
5.2.1 Shape, Size, and Dimensions—A drawing showing
6.3.1 Minimum information to be presented should include
shape,size,anddimensionsofthefatiguetestspecimenshould
the type of test (axial, rotary bending, plane bending, or
be presented including details on test section, grip section,
torsion), the derivation (or method of computation) of the test
fillets, radii, swaged portions, holes, and orientation of the
sectiondynamicstresses,and,whenapplicable,theexperimen-
fatiguetestspecimenwithrespecttothedirectionofmaximum
tal stress analysis techniques (for example, electric resistance
working of the material. When reporting the test results of
strain gages, photoelastic coating, etc.) used. The failure
notched fatigue specimens, the geometry of the notch, its
criterion and number of cycles to run-out used in the test
dimensions and stress concentration factor, the method of
program should be presented.
derivation of the stress concentration factor, and whether the
6.3.1.1 It is desirable but not required (unless by mutual
stress concentration factor is based on the gross or net area of
consent of the originator and user of the data) to include the
the test section should be presented.
procedure for mounting the specimen in the testing machine,
5.3 Listing of Information on Specimen Preparation:
grip details, and precautions taken to ensure that stresses
5.3.1 The minimum information to be presented should list,
induced by vibration, friction, eccentricity, etc., were negli-
inchronologicalorder,theoperationsperformedonthefatigue
gible.
test specimen, including the type of process used to form the
6.4 Ambient Conditions During the Fatigue Test—
specimen (for example, milling, turning, grinding, etc.), ther-
Minimum information to be presented should include the
mal treatment (for example, stress relieving, aging, etc.), and
average value and ranges of both temperature and relative
surface treatment (for example, shot-peening, nitriding, coat-
humidity that were observed in the laboratory during the test
ing, etc.). If the final specimen surface treatment is polishing,
program.
the polishing sequence and direction should be listed. If
6.5 Results of Post-Test Examination—Minimum informa-
deterioration of the specimen surface is observed during
tion to be presented for each fatigue test specimen should
storage, after preparation but prior to testing, the procedures
include the reason for test termination, either achievement of
that were used to eliminate the defects and changes, if any, in
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