The fracture behavior of a crack propagating in a large (4.8 m x 1.4 m) aircraft panel was investigated quantitatively by experiment for the first time using digital image correlation. Mixed mode (I+II) stress intensity factors were evaluated using a methodology, which combined digital image correlation with the multi-point over-deterministic method to fit displacement field equations to the experimental data from around a crack tip. More than 800 images were taken during a 10-minute time period as the fracture of the panel occurred under monotonic loading. It was observed that the crack propagated through the skin of the panel at a relatively low speed, with an average crack tip velocity of 0.014 mm/s, and changed its propagation direction at particular points due to the reinforcement of the structure. In the later stages of the test, substantial shear lips were observed indicating a state of plane stress as would be expected in a thin, wide panel and the size of the plastic zone increased substantially. The value of the mode I stress intensity factor obtained from the measured displacement fields initially increased linearly to around 50 MPa/m (KIc =37 MPa/m) and afterwards non-linearly reaching 300 to 400 MPa/m for crack extensions of the order of 100 mm. It is proposed that these high values of stress intensity factor do not represent an unrealistically high material fracture toughness but rather are indicative of the high resistance to crack growth of the structural assemblage of ribs, stringers and hole reinforcements in the panel which allow the skin to sustain a strain level that would otherwise cause unstable crack growth. Digital image correlation is demonstrated to be particularly powerful in elucidating this structural behavior.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Evaluation using digital image correlation of stress intensity factors in an aerospace panel


    Weitere Titelangaben:

    Bewertung der Spannungsintensitätsfaktoren in einem Flugzeugpaneel mit Hilfe der Digitalbildkorrelation


    Beteiligte:
    Du, Y. (Autor:in) / Diaz, F.A. (Autor:in) / Burguete, R.L. (Autor:in) / Patterson, E.A. (Autor:in)

    Erschienen in:

    Experimental Mechanics ; 51 , 1 ; 45-57


    Erscheinungsdatum :

    2011


    Format / Umfang :

    13 Seiten, 12 Bilder, 1 Tabelle, 31 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Determination of stress intensity factors and J integral based on digital image correlation

    Breitbarth, Eric / Strohmann, Tobias / Besel, Michael et al. | Deutsches Zentrum für Luft- und Raumfahrt (DLR) | 2019

    Freier Zugriff