Research On The Constitutive Model Parameters Identification Of304Stainless Steel

304Austenitic stainless steels have found wide applications in the industries of nuclear,aviation manufacturing, building materials chemical and food processing due to their goodmechanical properties, excellent corrosion resistance and heat resistance. However, greattoughness, low thermal conductivity of stainless steels are the major factors that result in theproblem of high temperature of tool nose, severe surface hardness and have a seriousinfluence on the surface quality and surface integrity. Constitutive relation, which was a grantcharacteristics and represents material mechanical property, was a key technique for thecutting simulation and was widely used in the mechanical model and cutting force prediction.This paper researched the influence of constitutive model parameters which wereseparately obtained from split Hopkinson bar (SHPB) experiment and cutting experiment oncutting force prediction.1.The static and dynamic mechanical properties of304stainless steel, which wereprocessed by solution treatement under temperature1100℃, have been separately measuredusing Material Testing System(MTS) and split Hopkinson pressure bar (SHPB) apparatus. Onthe base of the work, material parameters of Johnson-Cook model were observed.2.Designed and conducted orthogonal cutting experiment. Cutting force was measured byKistler apparatus in different cutting condition. Material parameters of Johnson-Cook modelwere observed by using the least square optimization technique.3.The two sets of the material parameters obtained from SHPB and cutting tests wereapplied to predict cutting force under various machining conditions, and their applicabilitywere compared. The comparison result provides the reference basis for the analysis model instainless steel cutting research as well as the selection of material flow stress model duringnumerical computation.