ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Many components from industry are subjected to repeated impacts, or in some casesthese impacts can appear as additional loads. Repeated impacts define a fatigue phenomenon knownunder the name of Impact Fatigue. Because the strain rate changes the material characteristics it isto expect that the material properties at impact fatigue to be different in regard to those obtained atnon-impact fatigue. First studies at repeated impacts were made at the middle of 19th Century, butthe progress in this field is not as fast as non-impact fatigue, due to experimental difficulties and thelake of standards for impact fatigue tests. This paper presents a classification of repeated impacttests, and starting from this a series of parameters used for durability estimation will be analyzed.The high number of parameters used by different authors creates difficulties in comparison thedifferent laboratories results. The importance of the shape and dimensions of specimens, and thestiffness of bearing are highlighted. In order to avoid these influences the authors proposed anexperimental technique, based on testing of Charpy specimens, in similar conditions as singleimpact test. The paper presents a series of results obtained for additional impacts overlapped to acyclic load
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.205.pdf
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