Constitutive relationship model of TC21 alloy based on artificial neural network
(1. School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;2. School of Mechanical and Electrical Engineering, North University of China, Taiyuan 030051, China)
Abstract: Constitutive equation is a necessary mathematical model to describe basic information of materials deformation and finite element simulation. There is a highly nonlinear relationship for flow stress as function of strain, strain rate and temperature. Based on the experimental data sets obtained from the isothermal compression tests conducted on a Gleeble-1500 thermal simulator, the flow behavior of TC21 alloy was studied systematically, and the constitutive relationship model for this alloy was developed using BP neural network. In the proposed model, the input variables are strain, strain rate and deformation temperature while the flow stress is the output variable. It was found that the established constitutive relationship model could provide a better representation of the test data and better describe the whole deforming process compared to the traditional method.
Key words: TC21 alloy; BP neural network; constitutive relationship