| In this thesis, the stress intensity factor K I, T11 and T 33 stresses along the crack front of the single edge cracked plate (SECP) specimens with the crack surface subjected to uniform, linear, parabolic or cubic stress distribution are calculated by three-dimensional finite element analyses. The relative crack depth, a/W, is varied by 0.2, 0.4, 0.6 or 0.8. And the relative thickness, t/W, is chosen by 0.1, 0.2, 0.5, 1.0, 2.0 or 4.0, respectively. For engineering applications, empirical equations of normalized stress intensity factor K I, T11 and T33 stress at the mid-plane are obtained.;The stress state around the crack front in the three-dimensional SECP specimens described by the stress intensity factor KI, T11 and T33 stresses are compared to the results from the finite element analyses. The differences between the Williams' expansion and finite element analyses varied by angle, radius and thickness are presented.;The thickness effect for the three parameters of stress intensity factor KI, T11 and T 33 stresses at the mid-plane of the SECP specimen is discussed in this thesis. The stress distribution applied on the crack surface is uniform pressure. In order to study the thickness effect completely, additional cases with relative thickness, t/W=0.0025, 0.025, 0.05, 8, 16 for crack surface subjected to the uniform stress distribution are calculated by finite element analyses. In addition, the relative crack depth effect of the stress intensity factor KI, T11 and T33 stresses at the mid-plane of the SECP specimen is discussed as well. The three parameters variation along the crack front are also investigated. |
