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Initiation and Early Growth of Fatigue\nCracks
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SYSNO ASEP 0531691 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Initiation and Early Growth of Fatigue
CracksAuthor(s) Polák, Jaroslav (UFM-A) RID, ORCID Number of authors 1 Source Title TMS 2019 148th Annual. - Cham : Springer, 2019 - ISSN 2367-1181 - ISBN 978-3-030-05861-6 Pages s. 1125-1135 Number of pages 11 s. Publication form Print - P Action TMS 2019 - Annual Meeting and Exhibition of The Minerals, Metals and Materials Society /148./ Event date 10.03.2019 - 14.03.2019 VEvent location San Antonio Country US - United States Event type WRD Language eng - English Country CH - Switzerland Keywords Crack initiation ; Crack growth ; Damage mechanism Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects LM2015069 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000560397400107 EID SCOPUS 85064854442 DOI 10.1007/978-3-030-05861-6_109 Annotation Experimental evidence concerning the mechanism of initiation and early
growth of short cracks are studied using FESEM, FIB and STEM observations of the
surface of fatigued specimens of several f.c.c.metals. The true shape of persistent slip
markings with high resolution is obtained on FIB cuts and using lamella milled on the
surface. Thick extrusions and parallel thin crack-like intrusions are typical feature
before crack initiates from the tip of the intrusion. STEM also reveals the relation of
the surface relief and internal structure of the material showing in copper ladder-like
dislocation structure. The shape of the persistent slip markings is confronted with the
predictions of the recent theoretical models. Study of the short crack growth and its
kinetics shows high density of initiated surface cracks and proves the acceleration of
the crack growth rate due to linkage of principal crack with initiated surface cracks.
Fatigue life is determined by the growth of short cracks and short crack growth law
is equivalent to the Manson–Coffin law.Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2021
Number of the records: 1