A novel approach to operating force evaluation in high strain rate metal-deforming technological processes

One of the major problems that exist in verifying metal-forming force models is a significant scatter in the measurements of the actual process force(s). This is essentially true for any high-energy rate forming process, which involves high strain, high strain rate and high process temperature. Owing to the fact that any energy propagates in waves, this paper suggests that the interaction of the energy waves might affect the actual process force(s). A novel concept of interaction between the deformation and heat waves has been studied. The metal-cutting process was selected as a test process because it involves a combination of extremely high strain rates, large strains and high temperatures. The experimental results obtained from bar taming tests prove the proposed concept by revealing the existence of reinforcements and interferences as the result of interactions of the heat and deformation waves. The influence of the process parameters on this interaction is also studied. (C) 2001 Elsevier Science B.V. All rights reserved.