A novel constitutive model for hot deformation behaviors of Ti-6Al-4V alloy based on probabilistic method
A novel constitutive model for hot deformation behaviors of Ti-6Al-4V alloy based on probabilistic method
复制标题
基于概率方法的Ti-6Al-4V合金热变形行为新型本构模型
DOI：
10.1007/s00339-016-0248-8
复制
发表时间：
2016-08-01
影响因子：
2.7
通讯作者：
Chen, Dong-Dong
中科院分区：
文献类型：
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作者：
Lin, Y. C.;Zhao, Chun-Yang;Chen, Dong-Dong
通过等温压缩实验研究了Ti-6Al-4V合金在变形温度850~950℃、应变速率0.001~1s(-1)下的流动行为。为了分析材料本身和测试程序引起的不确定性，在每个实验条件下进行重复压缩测试。研究发现，流动行为的不确定性太大，不容忽视。该研究的创新之处在于引入概率论来模拟流动行为。通过重采样方法创建3(12)(=531,441)组流动曲线，其中10,000组用于确定本构方程的材料参数。因此，可以很容易地获得材料参数的概率密度。发现大多数材料参数的概率密度函数类似于正态分布。建立的本构模型选取概率密度最大的材料参数值。所建立的本构模型的优点是能够描述Ti-6Al-4V合金最可能的流动特性。
The flow behaviors of Ti-6Al-4V alloy are studied by isothermal compressive experiments at the deformation temperature from 850 to 950 degrees C and strain rate from 0.001 to 1 s(-1). To analyze the uncertainties induced by material itself and testing procedure, repetitive compressive tests are conducted under each experimental condition. It is found that the uncertainties of flow behaviors are too great to be ignored. The innovation of the study is that the probability theory is introduced to model flow behaviors. 3(12) (=531,441) sets of flow curves are created by the resampling method, in which 10,000 sets are used to determine the material parameters of constitutive equations. Therefore, the probability densities of material parameters can be easily obtained. It is found that the probability density functions of the most material parameters are similar to the normal distribution. The values of material parameters with the maximum probability density are selected for the established constitutive model. The advantage of the established constitutive model is that it can describe the most probable flow characteristics of Ti-6Al-4V alloy.