Numerical analysis of alpha-beta brass by constitutive model for prediction of hot flow stress

Abstract

Alpha-Beta Brass alloys has an excellent hot working, high strength and malleability properties. This makes us to understand the plastic deformation performance of a material for finite element simulations. This research works gives, numeric analysis flow responses for α-β brass at higher temperatures by utilizing uniaxial tensile experiments. Isothermal tension experiments were been carried on α-β Brass alloy from 773 K temperature to 973 K at an span of 100 K with quasi-static rate of change in velocity (0.1, 0.001, and 0.01 s−1). The outcomes disclosed flow stress was more notably effect on temperature variation compared to strain rate. The material properties, like strength at elongation percentage, strength at ultimate level and yield point were noted at different temperatures. Microstructure features of fractured test samples have been investigated using scanning electron microscope. The fractography study revealed that at higher temperatures fractured specimens exhibits both ductile and brittle behaviour. In addition, constitutive based J-C model have been evolved by using experimental hot flow stress values. The acceptability of this J-C model is verified with statistical parameter. Various parameters like deviation standard (S%), correlation coefficient (R) and average percentage error (Δ%) were utilized to validate the significance of Johnson Cook method for α-β brass. The obtained predicted data are in favourable consensus with experimental data.

Keywords

• α-β brass alloy
• hot flow stress
• fractography
• Johnson Cook constitutive model
• Professor Swadesh Singh; Gokaraju Rangaraju Institute of Engineering and Technology; Hyderabad; India
• Mechanical Engineering