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Standard Test Method for Conducting Rotating Bending Fatigue Tests of Solid Round Fine Wire
Automaticky přeložený název:
Standardní zkušební metoda pro dirigování ohybem za rotace únavové zkoušky masivní kulatý jemného drátu
NORMA vydána dne 1.5.2014
Označení normy: ASTM E2948-14
Poznámka: NEPLATNÁ
Datum vydání normy: 1.5.2014
Kód zboží: NS-46294
Počet stran: 8
Přibližná hmotnost: 24 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
fatigue, rotating bending, wire, ICS Number Code 77.140.65 (Steel wire, wir ropes and link chains)
Significance and Use | ||||||||||||||
5.1 A method for obtaining fatigue strain (stress) at a specific life is of interest to the wire manufacturer, designer and consumer. The method is useful in production control, material acceptance and determination of the fatigue strain (stress) of the wire at a specific fatigue life, that is, fatigue strength. Rotating bending fatigue testing of small diameter solid round wire is possible by looping a specimen of predetermined length through an arc of 90° to 180°. The bending strain (stress) is determined from the geometry of the loop thusly formed. The methodology is capable of high frequency testing provided the temperature of the test article is constant and there is no adiabatic heating of the wire. A constant temperature can be maintained by immersing the specimen in a constant temperature fluid bath or test media. This makes it practical to quickly test a sufficient number of specimens to provide a statistical frequency distribution or survival probability distribution of fatigue life at a given strain (stress). Fatigue life information is useful to ascertain wire in-service durability and to assess, for example, the effects of melt practice and cold work processing. |
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1. Scope | ||||||||||||||
1.1 This test method is intended as a
procedure for the performance of rotating bending fatigue tests of
solid round fine wire to obtain the fatigue strength of metallic
materials at a specified life in the fatigue regime where the
strains (stresses) are predominately and nominally linear elastic.
This test method is limited to the fatigue testing of small
diameter solid round wire subjected to a constant amplitude
periodic strain (stress). The methodology can be useful in
assessing the effects of internal material structure, such as
inclusions, in melt technique and cold work processing studies.
However, there is a caveat. The strain, due to the radial strain
gradient imposed by the test methodology, is a maximum at the
surface and zero at the centerline. Thus the test method may not
seek out the “weakest link,” largest inclusions, that govern
uniaxial high cycle fatigue life where the strain is uniform across
the cross section and where fatigue damage initiates at a
subsurface location Note 1: The following documents, although not specifically
mentioned, are considered sufficiently important to be listed in
this test method: |
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2. Referenced Documents | ||||||||||||||
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