convergence very very slow
Hi all
In example , the box is usually 10*10*10 or 1*1*1, and particles size is usually a bit larger than the size of real sand.
However, when I tried to model grenoble sand (d50 = 0.33mm), I use two contact model
1, hertz model
2, Moment material model
in both model, after the isotropic compression, in the deviatoric compression process, usually the strain response is
very very small. 1000 step just make the strain in y direction go forward about 1e-6 or 1e-7.
So it needs maybe month or year to achieve a final strain in y of 0.3, say.
In my opinion, a high rigid modulus (usually quartz GPa), induce a high P wave speed, and a smaller size makes dt = r/ vp even
much more smaller than the usual sample in the tutorial(usually mod. = 1e5~6Pa, and particle size .5m)
So I do not know how to deal with this ques.
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