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运用Gleeble1500热模拟实验机对Ti-22Al-25Nb钛合金试样进行热模拟压缩试验,针对该合金高温变形过程时复杂的流变行为,以实验所得数据(变形温度940～1030℃,应变速率0.001～10s-1)为基础,从模糊集理论的本质特征出发,提出了一种基于模糊动态线性原理的本构模型,并与实验结果进行了对比。结果表明:基于模糊集理论建立的Ti-22Al-25Nb合金的高温本构关系模型是切实可行的,拟合程度较高,弥补了传统回归模型不能反映变形全过程的局限性,是一种有广泛应用前景的表征工程材料本构关系的便捷有效的方法。
The thermal simulation of Ti-22Al-25Nb titanium alloy was carried out by using Gleeble1500 thermal simulation machine. According to the complicated rheological behavior of Ti-22Al-25Nb titanium alloy, the experimental data (deformation temperature 940 ~ 1030 ℃, strain rate 0.001 Based on the essential characteristics of fuzzy set theory, a constitutive model based on fuzzy dynamic linear principle is proposed and compared with the experimental results. The results show that the model of high temperature constitutive model of Ti-22Al-25Nb alloy based on fuzzy set theory is feasible and has a high degree of fitting, which makes up the limitation that the traditional regression model can not reflect the whole process of deformation. Widely used and promising method of characterizing the constitutive relationship of engineering materials.