Hi ,

Recently i'm working on simulating an extrusion process

I use Abaqus explicit temp-displacement coupled step . My model contains 3 parts , a rigid die and a rigid punch and a deformable billet .

The problem is when i define a displacement boundry condition and i set it to the punch , at the end of the simulation punch has been moved more than what i expected to move .

For example i set the displacement for 20mm of movement and when the simulation finished , punch has been moved about 25mm . What is the problem ?

I define a smooth or tabular amplitude