Material constitutive modeling under high strain rates and temperatures through orthogonal machining tests

This paper presents a procedure to characterize deformation behavior applic able to various engineering materials in machining processes. Orthogonal ma chining tests are used to obtain the relationship between shear stress, str ain, strain rate and temperature. Shear plane temperature is measured by an infrared thermal imaging system and corn pared with the Loewen and Shalt m odel. A new procedure to determine strain rate in the shear zone is propose d based on a triangular shear zone model and grain boundary determined by o ptical microscopy. Finally, a constitutive model for a low carbon steel, de termined by the procedure, is presented and compared with existing results.