Hello everyone,
I am currently working on slope-stability modelling in Abaqus/CAE and I have encountered an issue related to stress initialization in Abaqus/Explicit.
In Abaqus/Standard, when I use an elastoplastic soil model, I can obtain a smooth and realistic in-situ stress distribution after the geostatic step. However, in Abaqus/Explicit, I define the initial geostress through the Predefined Field – Geostress option, and then I apply gravity loading and run the model for 10 seconds to allow the stresses to stabilize.
My expectation is that the final stress state (after this stabilization period) should closely match what I obtain in Abaqus/Standard. However, the results in Abaqus/Explicit show significant stress oscillations, including large jumps in stresses between neighbouring elements. This makes the stress field look unrealistic and unstable.
My questions are:
What causes these stress oscillations when using geostress initialization in Abaqus/Explicit?
What modelling techniques or numerical controls can I use to reduce or eliminate these oscillations and obtain a more realistic in-situ stress distribution?
Are there recommended damping strategies, loading durations, or mass scaling limitations for this type of quasi-static geostatic analysis in Explicit?
Any guidance would be greatly appreciated.
