ASTM E468-90(1998)
(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 establishes 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 test 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.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E 468 – 90 (Reapproved 1998)
Standard Practice for
Presentation of Constant Amplitude Fatigue Test Results for
Metallic Materials
This standard is issued under the fixed designation E 468; 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.
1. Scope 3.2 criterion of failure—complete separation, or the pres-
ence of a crack of specified length visible at a specified
1.1 This practice establishes the desirable and minimum
magnification. Other criteria may be used but should be clearly
information to be communicated between the originator and
defined.
the user of data derived from constant-force amplitude axial,
3.3 run-out—no failure at a specified number of load cycles.
bending, or torsion fatigue tests of metallic materials tested in
air and at room temperature.
4. Significance and Use
NOTE 1—Practice E 466, although not directly referenced in the text, is
4.1 Fatigue test results may be significantly influenced by
considered important enough to be listed in this standard:
the properties and history of the parent material, the operations
performed during the preparation of the fatigue specimens, and
2. Referenced Documents
the testing machine and test procedures used during the
2.1 ASTM Standards:
generation of the data. The presentation of fatigue test results
E 6 Terminology Relating to Methods of Mechanical Test-
should include citation of basic information on the material,
ing
specimens, and testing to increase the utility of the results and
E 8 Test Methods for Testing of Metallic Materials
to reduce to a minimum the possibility of misinterpretation or
E 206 Definitions of Terms Relating to Fatigue Testing and
improper application of those results.
the Statistical Analysis of Fatigue Data
E 466 Practice for Conducting Force Controlled Constant
5. Listing of Basic Information About Fatigue Test
Amplitude Axial Fatigue Tests of Metallic Materials
Specimen
E 467 Practice for Verification of Constant Amplitude
5.1 Specification and Properties of Material:
Dynamic Loads on Displacements in an Axial Load
5.1.1 Material Prior to Fatigue Test Specimen
Fatigue Testing System
Preparation—The minimum information to be presented
2.2 Special Technical Publications:
should include the designation or specification (for example, A
STP 91 A Guide for Fatigue Testing and the Statistical
441, SAE 1070, and so forth) or proprietary grade; form of
Analysis of Fatigue Data
product (for example, plate, bar, casting, and so forth); heat
STP 588 Manual on Statistical Planning and Analysis
number; melting practice; last mechanical working and last
heat treatment that produced the material in the “as-received”
3. Terminology Definitions and Nomenclature
condition (for example, cold-worked and aged, annealed and
3.1 The terms and abbreviations used in this practice are
rolled, and so forth); chemical composition; and surface
defined in Terminology E 6 and in Definitions E 206. In
condition (for example, rolled and descaled, ground, and so
addition, the following nomenclature is used:
forth).
5.1.1.1 It is desirable but not required (unless by mutual
consent of the originator and user of the data) to list the raw
material production sequence, billet preparation, results of
This practice is under the jurisdiction of ASTM Committee E-8 on Fatigue and
Fracture and is the direct responsibility of Subcommitee E08.05 on Cyclic cleanliness analysis, or a combination thereof, when appli-
Deformation and Fatigue Crack Formation.
cable.
Current edition approved April 27, 1990. Published June 1990. Originally
5.1.2 Material in the Fatigue Test Specimen:
published as E 468 – 72 T. Last previous edition E468 — 82.
5.1.2.1 Mechanical Properties—The minimum data on the
Annual Book of ASTM Standards, Vol 03.01.
Discontinued, See 1986 Annual Book of ASTM Standards, Vol 03.01.
mechanical properties of the material in a condition identical to
A Guide for Fatigue Testing and the Statistical Analysis of Fatigue Data, ASTM
that of the fatigue test specimen should include the tensile
STP 91 A, ASTM, 1963. Out of print; available from University Micro- films, Inc.,
strength, yield point or yield strength at a specified onset;
300 N. Zeeb Rd., Ann Arbor, MI 48106.
Manual on Statistical Planning and Analysis, ASTM STP 588, ASTM, 1975. elongation in a specified gage length; reduction of area when
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E 468 – 90 (1998)
applicable; and the designation of the test used to procure the used to accommodate expected or observed heterogeneities
mechanical properties (for example, ASTM Methods E 8, should be presented. Statistical techniques are described in
4 5
Tension Testing of Metallic Materials, and so forth). If notched ASTM STP 91 and STP 588 .
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, crank and lever, rotating mass, 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. than one machine, the number of testing machines used should
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.
NOTE 2—For guidance on axial load machines, refer to Practice E 467.
5.2 Minimum Information to Be Presented on Design of
6.3 Fatigue Test:
Fatigue Test Specimen in the “Ready-To-Test” Conditions:
6.3.1 Minimum information to be presented should include
5.2.1 Shape, Size, and Dimensions—A drawing showing
the type of test (axial, rotary bending, plane bending, or
shape, size, and dimensions of the fatigue test specimen should
torsion), the derivation (or method of computation) of the test
be presented including details on test section, grip section,
section dynamic stresses, and, when applicable, the experimen-
fillets, radii, swaged portions, holes, and orientation of the
tal stress analysis techniques (for example, electric resistance
fatigue test specimen with respect to the direction of maximum
strain gages, photoelastic coating, etc.) used. The failure
working of the material. When reporting the test results of
criterion and number of cycles to run-out used in the test
notched fatigue specimens, the geometry of the notch, its
program should be presented.
dimensions and stress concentration factor, the method of
6.3.1.1 It is desirable but not required (unless by mutual
derivation of the stress concentration factor, and whether the
consent of the originator and user of the data) to include the
stress concentration factor is based on the gross or net area of
procedure for mounting the specimen in the testing machine,
the test section should be presented.
grip details, and precautions taken to ensure that stresses
5.3 Listing of Information on Specimen Preparation:
induced by vibration, friction, eccentricity, etc., were negli-
5.3.1 The minimum information to be presented should list,
gible.
in chronological order, the operations performed on the fatigue
6.4 Ambient Conditions During the Fatigue Test—Mini-
test specimen, including the type of process used to form the
mum information to be presented should include the average
specimen (for example, milling, turning, grinding, etc.), ther-
value and ranges of both temperature and relative humidity that
mal treatment (for example, stress relieving, aging, etc.), and
were observed in the laboratory during the test program.
surface treatment (for example, shot-peening, nitriding, coat-
6.5 Results of Post-Test Examination—Minimum informa-
ing, etc.). If the final specimen surface treatment is polishing,
tion to be presented for each fatigue test specimen should
the polishing sequence and direction should be listed. If
include the reason for test termination, either achievement of
deterioration of the specimen surface is observed during
the failure criterion or run-out, and, if applicable, a description
storage, after preparation but prior to testing, the procedures
of the failure surface appearance and location of the crack
that were used to eliminate the defects and changes, if any, in
origin.
shape, dimensions, or mechanical properties should be listed.
5.3.1.1 It is desirable but not required (unless by mutual
7. Presentation of Fatigue Test Results
consent of the originator and user of the data) to include details
7.1 Tabular Presentation—It is desirable but not required
of the operations performed (for example, feed, speed, depth of
(unless by mutual consent of the originator and user of the
cut and coolants, thermal cycles, etc.), and the surface residual
data) that the fatigue test results be reported in tabular form.
stresses of the specimen, if measured.
When used, the tabular presentation should inc
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.