Under high-velocity impact, energy absorption saturates with increase in impact velocity above ballastic limit, but for fiber metal GFRP laminates, it increases with increase in impact velocity why?
Point is that you are using fibre metal GFRP laminates. Hence, the stiffness and impact resistance will soar. Accordingly, the absorption of energy increases with impact velocity for this kind. One of the article is given below.
N. Razali, M.T.H. Sultan, S.N.A. Safri, S. Basri, N. Yidris, and F. Mustapha, “High Velocity Impact Test on Glass Fibre Reinforced Polymer (GFRP) Using a Single Stage Gas Gun (SSGG) – An Experimental Based Approach”, Appl. Mech. and Mat. Vol. 564 pp 376–381. 2014.