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


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.

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