I do not know very clearly that CFORCE is a force per area and that I must define previously this area. In my problem, I have two solids (a rectangular plate and a impactor) that makes contact after dropping to the impactor from certain height. I have defined the superior surface of the plate and the inferior one of the impactor with the Module --->Interaction in Abaqus /Explicit.
Is this sufficient one? I must define something more?