The total time period of step is 5.5 sec but after 0.5 sec there are increments and changes in energy but no change in time.I have attached a snapshot showing the same.Please suggest.
This is a wild guess, but your number of increments is incredibly large and the problem seems to occur when it reaches about 2^24=16777216 - possibly you pass some memory address limit?
It may be possible (I don't know, the numbers just look suspicious) that Abaqus simply fails if the number of incrments exceeds 2^24, die to memory adressing issues. To testthis, create a simple model and see whether you can run this for more than 2^24 increments.