Počet záznamů: 1

The effect of a free surface on fatigue crack behaviour

  1. 1.
    0354030 - UFM-A 2011 RIV GB eng J - Článek v odborném periodiku
    Hutař, Pavel - Náhlík, Luboš - Knésl, Zdeněk
    The effect of a free surface on fatigue crack behaviour.
    International Journal of Fatigue. Roč. 32, č. 8 (2010), s. 1265-1269 ISSN 0142-1123
    Grant CEP: GA ČR GA106/09/1954; GA ČR GA101/09/0867
    Výzkumný záměr: CEZ:AV0Z20410507
    Klíčová slova: Vertex singularity * Generalized stress intenzity factor * Stress singularity * Fatigue crack * V-notch
    Kód oboru RIV: JL - Únava materiálu a lomová mechanika
    Impakt faktor: 1.799, rok: 2010

    The effect of a free surface on fatigue crack behaviour is discussed in the paper and generalized stress intensity factor methodology is used for a reliable estimation of the fatigue crack propagation rate in the area close to a free surface, where the effect of vertex singularity is important. It is shown that a decrease in the stress singularity exponent close to the vertex point leads to a decrease in the fatigue crack propagation rate and contributes to a typical curved crack front shape. The numerical estimations of the crack shape correspond well with experimental observations taken from the literature. The proposed methodology facilitates explanation of the experimentally observed decrease in the fatigue crack propagation rate (FCPR) for thin structures. It is shown, that decrease of FCPR depends on Poisson’s ratio and parameters of the Paris–Erdogan law for corresponding materials.
    Trvalý link: http://hdl.handle.net/11104/0193122