I am solving the fatigue problem by employing a phase-field approach on a single-edge notched plate. My objective is to induce cyclic displacement along the y-direction at the plate’s top using the prescribed expression:
c = Expression(“t * 0.0”, “d_u * abs(sin(pi/2 * t))”, degree=1, t=0, d_u=2e-3)
Within the time loop, I’m utilizing c.t = t to enforce the cyclic displacement. However, upon executing the code, I’m observing no deformations in the plate, suggesting a potential issue with the application of displacement boundary conditions.
Upon further investigation, substituting "t * 0.0" with "t" in the expression yields plate deformation, albeit with a non-cyclic behavior; instead, the displacement increases linearly with time.
Do any adjustments need to be made to the expression? Any assistance on this matter would be highly appreciated.
Thanks.