شبكة التخطيط العمراني بسم الله الرحمن الرحيم
للكاتبين :
S.E.H. EL-Gemae1, L.A. Abdel-Latif2, S.A.A. Sayedb, A.A. Abdel-Alhady2, and H.E.M. Sallam3
1Mechanical Engineering Department, Al Azhar University, Cairo, Egypt
2Mechanical Design Department, Mataria, Helwan University, Cairo, Egypt.
3Materials Engineering Department, Zagazig University, Zagazig, Egypt
ABSTRACT
Two dimension elastic-plastic finite element model was used to study the initiation and growth
behavior of crack emanating from elliptical notch containing small inclined scratch. Edge plate
was utilized under monotonic and constant amplitude cyclic loading with zero stress ratio. The
effect of notch geometry, the initial scratched crack length, Lo, and initial scratched inclinationangle, θ, on the path of the emanating crack will be considered. When the tip of a crack was
advancing within the affected zone of the simulated notch, transition behavior from the notchaffected
physical short crack regime to the relatively long crack regime was recognized. The
extents of monotonic and cyclic crack tip plastically deformed zone and near tip-relative
displacement were of interest during crack advance. The advancing of inclined scratched crack
presence on elliptical notch was continuity in its inclination up to a certain length at which the
crack return to the preferred plane of crack growth (which is usually perpendicular to the applied
load, Mode I stress intensity factor).