Constitutive relationship research on BT25 titanium alloy based on strain compensation and BP neural network [基于应变补偿和BP神经网络的BT25钛合金本构关系研究]

作者：Feng R.; Wang K.-L.^*; Lu S.-Q.; Li X.; Ouyang D.; Zhou X.; Zhong M.-J.

来源：Journal of Plasticity Engineering, 2020, 27(12): 183-190.

DOI：10.3969/j.issn.1007-2012.2020.12.026

• BP neural network
• BT25 titanium alloy
• Constitutive model
• Hot deformation behavior
• Strain compensation

The hot compression tests were carried out to study the hot deformation behavior of BT25 titanium alloy by Gleeble-3500 thermal simulator at deformation temperature of 950-1100 ℃, strain rate of 0.001-1 s-1 and maximum reduction of 60%. The Arrhenius constitutive models based on strain compensation of α+β two-phase region and β single-phase region were established, and the constitutive relation model based on BP neural network was constructed. The results show that the alloy is sensitive to the deformation temperature and strain rate,and the flow stress of the alloy increases with the decrease of deformation temperature and the increase of strain rate. In α+β two-phase region, the correlation coefficient R of the constitutive model based on strain compensation is 0.981 and in β single-phase region, the correlation coefficient R is 0.984. The correlation coefficient R of the constitutive model based on BP neural network is 0.996,which indicates that BP neural network model has higher accuracy and can predict the high temperature rheological stress of BT25 titanium alloy better.

• 单位
  南昌航空大学