Volume 37, Issue 2 (March 2009)

    Experimental and Numerical Determination of Mixed Mode Crack Extension Angle

    (Received 19 January 2008; accepted 18 November 2008)

    Published Online: 2008


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    Crack initiation angles for mixed mode fracture are measured and predicted using photoelastic and finite element techniques. Different crack inclination angles (0°, 10°, 20°, 30°, and 40°) are considered. The Schroedl and Smith method is used for estimating pure opening mode I stress intensity factor. On the other hand, the Sanford and Dally method is used to estimate stress intensity factors in mixed mode (I and II). The Smith and Smith method for estimating mixed mode SIF is also examined. In addition, the ANSYS finite element code is employed to estimate the pure and mixed mode SIF numerically. The estimated values of the SIF from both finite element analysis and photoelasticity are incorporated into six criteria for crack initiation angle prediction. The applicability of the crack initiation criteria such as maximum tangential stress (MTS), minimum strain energy density (S), maximum dilatational strain (T), maximum triaxial stress (M), modified MTS (MMTS), (R) criterion, and fringe symmetry axis method (FSAM) are investigated. An experimental setup is used to measure the initiation angles at different crack inclinations. The measured crack initiation angles are used to validate the predicted values. The results showed that the initiation angles estimated by different criteria using SIFs determined experimentally and numerically compared well with the measured ones, especially at higher inclination angles.

    Author Information:

    Merah, Nesar
    Mechanical Engineering Department King Fahd University of Petroleum and Minerals, Dhahran,

    Albinmousa, Jafar
    PhD candidate, Department of Mechanical and Mechatronics Engineering, University of Waterloo, ON

    Stock #: JTE101668

    ISSN: 0090-3973

    DOI: 10.1520/JTE101668

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    Title Experimental and Numerical Determination of Mixed Mode Crack Extension Angle
    Symposium , 0000-00-00
    Committee E08