Investigation of Energy-Absorbing Mechanisms in the Impact Behavior and Rain Erosion Resistance of Pure Nickel.

摘要

The impact behavior of pure nickel 270at velocities of 100to 432feet per second with nylon sphere impact and the rain erosion resistance at velocities of 100-1100feet per second in one inch hour rainfall were investigated to determine the mechanisms whereby nickel absorbs the energy of the impacts and thereby possesses good erosion resistance. The reduction in slope of the crater-depth-versus-velocity curve for steel-sphere impacts against nickel,which occurs at velocities from 200to 210ft/sec,is a real effect. This unusual feature in the cratering behavior of nickel cannot be ascribed to plastic flow and/or work-hardening of the nickel. Results of this study suggest that it may be ascribed to the operation of an energy sink in the nickel and that,on the basis of energy considerations,this sink may be the magnetic transition. (Author)