Počet záznamů: 1  

Initiation and Early Growth of Fatigue\nCracks

  1. 1.
    0531691 - ÚFM 2021 RIV CH eng C - Konferenční příspěvek (zahraniční konf.)
    Polák, Jaroslav
    Initiation and Early Growth of Fatigue
    TMS 2019 148th Annual. Cham: Springer, 2019, s. 1125-1135. The Minerals, Metals & Materials Series. ISBN 978-3-030-05861-6. ISSN 2367-1181.
    [TMS 2019 - Annual Meeting and Exhibition of The Minerals, Metals and Materials Society /148./. San Antonio (US), 10.03.2019-14.03.2019]
    Grant CEP: GA MŠk LM2015069; GA MŠk(CZ) LQ1601
    Institucionální podpora: RVO:68081723
    Klíčová slova: Crack initiation * Crack growth * Damage mechanism
    Kód oboru RIV: JG - Hutnictví, kovové materiály
    Obor OECD: Materials engineering

    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.
    Trvalý link: http://hdl.handle.net/11104/0311462
Počet záznamů: 1