SPH method: why the start point different when fill different partilce ?

Hi everyone,

Recently I was confoused by the result .I've been struggling for two weeks. Particular details as follow

What the graph reflect is a simulation with AUTODYN-3D and use  SPH method. these result are simulated in a same model with different particle size. and with the same boundaries ,material. So it's strange why there is a plateau between time and stress when the particle size is 0.2 ,0.4 or 0.25. I have checked it for twince. i don't know why it happened.

Is there Anybody farmiliar with SPH method? I will be very appreciate for what you provide


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