Research on Constitutive Relation of TC11 Titanium Alloy Based on PSO-LSSVM

Abstract

Abstract In order to accurately predict the flow behavior of the TC11 titanium, the uniaxial compressive tests of TC11 titanium alloy were carried out by Gleeble-1500 thermal simulator with the temperature in the range of 900∼1050°C, and the strain rate of 0.1∼10s−1. Then the particle swarm optimization (PSO) was used to optimize the parameters of the least square support vector machine (LSSVM) model, and a high-temperature constitutive model of TC11 titanium alloy based on PSO-LSSVM was established, and the average relative error between the predicted value and the experimental value of the established constitutive model based on PSO-LSSVM is 1.51%, and the correlation coefficient is 0.997. The established constitutive model can accurately predict the high temperature flow behavior of TC11 titanium alloy. This indicated that a new method for establishing the constitutive model is provided.