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Rigid body impact with steel plate, Error with too many atempts for this increment

I am getting this warning message many times " system matrix has 1 negative eigenvalues", strain increment too large, and finally stop with the error "Too many attempts made for this increment.

I modelled a Steel Barge(front part of ship) with shell elements and it is impacted by  a rigid body. When the rigid body was given a displacement of 2.5 inches it runs. But when I increase the displacement to more than that it doesnt work. I should get the Force displacement behaviour of barge by impacting this rigid pier in to it at least 20-40inch.

Barge modell is with series of longitudinal and transverse steel trusses modelled with linear shell elements.

My time steppings are redused as below. But still it doesn't work.

Increment size=0.001

Minimum= 1E-20

Maximum=0.001

Maximum number of increments=10000

Any comment is highly appreciate.

Thank you.
Nilu

 

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