Ti/Ni/Ti层状复合材料热压缩流动应力预测

Flow Stress Prediction for Ti/Ni/Ti Laminated Composites During Hot Compressing

为了建立合理的能够描述Ti/Ni/Ti层状复合过程的本构方程,在Gleeble-3500热机械模拟机上对Ti/Ni/Ti层状复合材料在变形温度为550~850℃,应变速率为0.001~1 s^(-1),变形量为65%的复合过程中热变形行为进行研究。采用4种本构模型:改进的Johnson-Cook(MJC)模型、应变补偿Arrhenius(SCA)模型、多元非线性回归(DMNR)模型和改进的井上胜郎(MIS)模型对层状复合材料的高温流变行为进行预测。同时,对4种模型的实验值和预测值进行了比较。此外,比较了平均绝对相对误差(AARE)、相关系数(R)和相对误差的准确性,以确定这4种模型的合理性。结果表明,MJC、DMNR和MIS模型都不适合描述Ti/Ni/Ti层状复合材料的流变行为,而SCA模型除了在某些特定变形条件外,其预测值与实验值吻合较好。

In order to establish a constitutive equation which can reasonably describe the Ti/Ni/Ti laminated composites process,the hot deformation behavior of Ti/Ni/Ti laminated composite during the bonding process was studied on Gleeble-3500 thermomechanical simulator at the temperature of 550~850°C,strain rate of 0.001~1 s^(-1),and deformation of 65%.Four constitutive models,including modified Johnson-Cook(MJC)model,train compensated Arrhenius(SCA)model,multivariate nonlinear regression(DMNR)model,and modified Inoue Sin(MIS)model were used to predict the elevated temperature flow behavior of laminated composite.A comparative research on the experimental values and the predicted values of the four models was conducted.Besides,the accuracy of the average absolute relative error(AARE),correlation coefficient(R)and the relative error was compared to confirm the reasonability of these four models.Results show that the MJC,DMNR and MIS model are not suitable for the description of flow behavior of Ti/Ni/Ti laminated composites,while the predicted values of SCA model agree well with the experimental values except under some deformation conditions.