Problem with Abaqus/Explicit, General Contact Problem

[AfshinPHashemi]

Hello everybody,
I am new to Abaqus and I have faced a weird problem while implementing general contact. I tried different models but the problem already exists.
My model i.e parts, properties, mesh, step, interactions and etc are completely based on tutorials found on net but my result is completely different. Actually, All the general contact created in Abaqus are ignored and the parts simply pass through each other without any interactions. I tried different scenarios like two 3D parts, 3D body & shell, 3D and analytical rigid but none of them worked. It seems that general contacts created are simply ignored by the solver.
I am wondering if anybody has any idea on this problem?

 

[ShadowWarrior]

Try to use tiny step time increment, e.g. 10e-7.

 

[IceBreakerSours]

What is the deformation scale factor?

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[AfshinPHashemi]

I solved the problem. Actually, I had entered wrong density for material. I don't know why this issue leads to movement without any kind of interactions. By the way, wrong density value was the cause.