I am required to perform turning operation at constant velocity and depth of cut but for different feed using Abaqus. However I can't understand how do I associate feed in my model/simulation.
You need to understand what the process is you are modelling in a 2D orthogonal cutting simulation. There are two real machining operations which could be close analogs:
1. facing the end of a tube with the same wall thickness as the thickness of the cutter.
2. Turning down the radius of a fin with the same thickness of the cutter
In both cases, the feed speed and the depth of cut are not independent parameters. The depth of cut is the distance that the cutter advances (at the feed rate) during a single rotation of the work piece.