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Breast from supine to gravity free config.

Breast from supine to gravity free config.

Breast from supine to gravity free config.

I have a cae model of breast with skin, fat and a rigid back surface. These were created from solidworks using 3d surface images. Now my first step to get the unloaded configuration was to make sure the skin is in contact with the breast and breast with the back surface. So I am using surf-surf interaction properties to get the contact initiated reasonably (meaning it is not in perfect contact everywhere). Next I apply the necessary BCs and gravity load in appropriate direction to get unloading config. However, in this step, abaqus quits saying the time increment is too small. So my understanding is that I am either applying a completely off logic with regards to my gravity-less config here that abaqus can't solve this or the error is associated with the mesh type I am using or he BCs I am using here. Can anyone help me figure out what is wrong here. I am a beginner in abaqus and I would appreciate any help/suggestions I can get.
The cae file is here.

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