This paper presents a probabilistic short crack growth model to estimate the fatigue life distribution for bare 2024-T351 coupons. Fractographic analysis has clearly shown that the majority of cracks nucleate from the constituent particles present in bare 2024-T351 coupons. The existing fracture mechanics models have difficulty in 'growing' a small-particle-induced crack (i.e. infinite life), and cannot correlate the size of a crack-nucleating particle to the length of the fatigue life in cases where a small (large) particle results in a short (long) life. In this probabilistic model, particle width and height distributions were first used to account for the randomness of the particle size. Then another random variable, the stress intensity factor limit, Delta KIDS, for particle-induced cracks, was introduced to account for the combined effect of microstructure features (e.g. grain size, grain orientation, and grain boundary) on short crack growth. A Microsoft Excel VBA (Visual Basic for Applications) program was developed and linked with the AFGROW COM (Component Object Model) server to estimate the life distribution using the Monte Carlo technique. The results showed that by including the Delta K IDS for particle-induced cracks, the model was able to 1) correlate a crack-nucleating particle to the individual fatigue life, including 'smaller (larger) particle, shorter (longer) life' cases; and 2) better estimate the fatigue life distribution.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Probabilistic modeling of short crack growth in airframe aluminum alloys


    Contributors:


    Publication date :

    2007


    Size :

    13 Seiten, 19 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Probabilistic Modeling on Short Crack Growth in Airframe Aluminum Alloys

    Liao, Min / Renaud, G. / Bellinger, Nick | AIAA | 2007


    Probabilistic Modeling on Short-Crack Growth in Airframe Aluminum Alloys

    Liao, Min / Renaud, Guillaume / Bellinger, Nick | AIAA | 2008



    Probabilistic Crack Growth Analysis for Airframe Applications

    Pawlik, M. / Perez, R. / Register, D. | British Library Online Contents | 1993


    Corrosion and Corrosion Fatigue of Airframe Aluminum Alloys

    Chen, G. S. / Gao, M. / Harlow, D. G. et al. | British Library Conference Proceedings | 1994