Potrebujeme váš súhlas na využitie jednotlivých dát, aby sa vám okrem iného mohli ukazovať informácie týkajúce sa vašich záujmov. Súhlas udelíte kliknutím na tlačidlo „OK“.
Standard Test Method for Conducting Rotating Bending Fatigue Tests of Solid Round Fine Wire
Automaticky preložený názov:
Štandardná skúšobná metóda pre dirigovanie ohybom za rotácie únavovej skúšky masívny okrúhly jemného drôtu
NORMA vydaná dňa 1.5.2014
Označenie normy: ASTM E2948-14
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.5.2014
Kód tovaru: NS-46294
Počet strán: 8
Približná hmotnosť: 24 g (0.05 libier)
Krajina: Americká technická norma
Kategória: 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. |
||||||||||||||
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: |
||||||||||||||
2. Referenced Documents | ||||||||||||||
|
Historická
1.4.2013
Historická
1.11.2008
Historická
1.11.2008
Historická
15.8.2014
Historická
15.5.2014
Historická
15.5.2014
Chcete mať istotu, že používate len platné technické normy?
Ponúkame Vám riešenie, ktoré Vám zaistí mesačný prehľad o aktuálnosti noriem, ktoré používate.
Chcete vedieť viac informácií ? Pozrite sa na túto stránku.
Posledná aktualizácia: 2024-11-01 (Počet položiek: 2 208 817)
© Copyright 2024 NORMSERVIS s.r.o.