Can we restrict the vertical and horizontal displacement in two directions for the lower semicircular in bottom hole of CT specimen and apply incremental displacement in the upper semicircular in top hole?
Or is it done some other way?
Thank you for the response,
If I am applying displacement as input for upper left pin load, uniform displacment can be applied or not?
What is the significance of the displacement Ux=0 at upper right corner?
Yes it can be solved, but what I am trying to figure out is regarding the correct boundary condition. Why do I need to restrict the horizontal displacement at the upper right corner node. And what is wrong in considering the lower semicircle of the lower hole fixed and applying displacement at the upper semicircle of the upper hole. I want to understand the physics behind it. As per my experimental observation, the aforementioned BCs should hold good. I am new to computational mechanics. Please note: I am not using any commercial FEA solver for modelling this problem, rather I am trying to code it in MATLAB.
What are the blue dots at nodes 1, 61,66 and 67? is it Uy equals zero at those nodes?
Why is meshing done in such a way that finer mesh is towards left and coarse towards right? Meshing should be fine at the crack tip.
I got your point regarding Ux equals zero at top right corner.
If I consider the problem domain to be the entire CT specimen. What will be the boundary conditions? In that case do I have to restrict the Uy in the middle portion along the direction of crack?