للكاتبين :
M.M.I. Hammouda1, A.A. Abdel-Alhady2, A.S. Fayedc, H.E.M. Sallam3
1 Mechanical Eng. Dept., University of Engineering and Technology, Taxila, Pakistan
2 Mechanical Design Department, Mataria, Helwan University, Cairo, Egypt.
3 Materials Engineering Department, Zagazig University, Zagazig, Egypt
ABSTRACT
Notch elastic affected zone and the path of crack emanating from a single inclined elliptical edge
notch are studied in this paper numerically. The influence of the notch orientation and notch
geometry are considered. Acrylic polymer plates having the same single edge notches are tested
experimentally to determine the site of crack initiation and the influence of the geometry and
inclination angle of the notch on the elastic stress concentration factor.
The prediction of crack path based on the maximum mode I stress intensity factor or on the
maximum crack tip opening displacement is adopted in the present analysis. Equivalent edge
crack length is assumed based on the equality of stress intensity factors. The highest equivalent
stress on the surface of inclined notch was found at the point has the largest horizontal coordinate
(= horizontal projection), i.e. site of crack initiation. This is corroborating with the experimental
result. Therefore, stress concentration factor was predicted as a function of the geometry and
inclination angle of the notch. It is found that, notch elastic affected zone and the path of crack
emanating from the notch are dependent on the geometry of the notch in addition to their
horizontal projection.