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(OP)
I am trying to run a adhesive bonded aluminum laminate lap joints with a three fastners in it.
***The Element type for adhesive aluminum Plate is C3D8I and for fastners C3D8R.
***Two different steps one for the load and one for the Bolt load since i need to give pretension surface for the fastners.
***Two different interaction prop for plate to plate & plate to fastner
***Gave Interactions under intial step like three interactions for each fastner and plate to plate(fastner top flange to plate top surface, fastners bottom flange to plate bottom surface and plate hole and bolt cylinder).
****Interactions are under intial step > surface to surface contact > small sliding w.r.t interaction property.

When i am running the file It gives the error like
***TOO MANY INCREMENTS NEEDED TO COMPLETE THE STEP***
and when i am trying the model by decreasing or increasing the step increments it gives a different error like
***TIME INCREMENT REQUIRED IS LESS THAN THE MINIMUM SPECIFIED****
The same thing is going on from the last month and i thought of taking help from you guys..
I am also attaching the input file and model goemetry for this model here where you people may get clear idea

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