ADIABATIC FLOW CURVES OF METALLIC MATERIALS AT HIGH-STRAIN RATES

Dynamic compression tests are carried out on Armco iron, Cr-V-steel, N i-Cr-Mo-V-steel, an austenitic Ni-Cr-Mo-steel, tantalum, nickel and Ni 3Al and magnesium. The flow curves are analysed to determine the influ ence of the deformation energy which is transformed into heat on the f low behaviour and mechanical stability. Not only the material properti es but also the conditions of friction between the specimen and the co mpression tool are found to have a greate influence on the flow stress reduction and stability. High frictional forces promote mechanical in stability of materials with low strain hardening and low strain rate s ensitivity.