STUDY ON RHEOLOGICAL BEHAVIOR AND CONSTITUTIVE MODEL OF TA17 TITANIUM ALLOY AT HIGH STRAIN RATE

JIA HaiShen; XIA ShiYu; ZHANG JiLin; LUO WenCui; SHEN JianCheng; CHEN YanXiang; XU ChuangWen

doi:10.16579/j.issn.1001.9669.2022.04.012

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STUDY ON RHEOLOGICAL BEHAVIOR AND CONSTITUTIVE MODEL OF TA17 TITANIUM ALLOY AT HIGH STRAIN RATE

更新时间：2022-09-22

- STUDY ON RHEOLOGICAL BEHAVIOR AND CONSTITUTIVE MODEL OF TA17 TITANIUM ALLOY AT HIGH STRAIN RATE
- Journal of Mechanical Strength Vol. 44, Issue 4, Pages: 837-844(2022)
- 作者机构：
  
  1. 兰州工业学院绿色切削加工技术及应用甘肃省高校重点实验室
  2. 兰州工业学院
  3. 兰州工业学院甘肃省精密加工技术及装备工程研究中心
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2022.04.012
  CLC：
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JIA HaiShen, XIA ShiYu, ZHANG JiLin, et al. STUDY ON RHEOLOGICAL BEHAVIOR AND CONSTITUTIVE MODEL OF TA17 TITANIUM ALLOY AT HIGH STRAIN RATE. [J]. 44(4):837-844(2022)
DOI：

JIA HaiShen, XIA ShiYu, ZHANG JiLin, et al. STUDY ON RHEOLOGICAL BEHAVIOR AND CONSTITUTIVE MODEL OF TA17 TITANIUM ALLOY AT HIGH STRAIN RATE. [J]. 44(4):837-844(2022) DOI： 10.16579/j.issn.1001.9669.2022.04.012.

摘要

在温度为25℃下，对TA17钛合金进行了准静态(应变率为0.001 s,-1,～0.01 s,-1,)和动态(应变率为1 000 s,-1,～5 000 s,-1,)压缩试验。研究了其应变硬化特性以及应变率对其流变行为的作用机制，并借助应变硬化指数(n)、应变率敏感性指数(m)定量研究其高应变率下的流变特征。基于TA17钛合金所呈现的动态流变特征，并考虑应变、应变率间的耦合作用对其流动应力的影响，构建了一种新型J-C本构模型。依据所获取的实验数据对模型参数进行识别，将模型预测值与实验数据进行对比分析，并引入相关系数(R)和平均相对误差两个参数对所构建的本构模型的预测精度进行评估。结果表明：TA17钛合金呈现出明显的应变硬化，应变率强化以及应变率增塑效应，其流变行为受应变、应变率以及二者间的耦合作用的支配。应变硬化指数随应变、应变率的增加均减小，而应变率敏感性指数随着应变率的增加而增加，随着应变的增加而减小。所构建的本构模型，其相关系数(R)为0.997 7,平均相对误差为0.27%,能够较准确地预测其高应变率下的流变行为。

Abstract

The quasi-static(Strain rate of 0.001 s,-1,～0.01 s,-1,) and dynamic(Strain rate of 1000 s,-1, ～ 5 000 s,-1,) compression tests of TA17 titanium alloy were conducted on at 25℃. The strain hardening characteristics and the mechanism of strain rate on its rheological behavior were studied, and the rheological characteristics under high strain rates were quantitatively studied by means of strain hardening index（n） and strain rate sensitivity index（m）. Based on the dynamic rheological characteristics of TA17 titanium alloy and considering the influence of the coupling between strain and strain rate on its flow stress, a new J-C constitutive model is constructed. based on the obtained experimental data, the model parameters are identified, the predicted values of the model are compared with the experimental data, and the two parameters of correlation coefficient（R） and average absolute relative error are introduced to evaluate the prediction accuracy of the constructed constitutive model.The results show that TA17 titanium alloy exhibits obvious strain hardening, strain rate strengthening and strain rate plasticizing effects, and its rheological behavior is dominated by strain, strain rate and the coupling between them. The strain hardening index decreases with the increase of strain and strain rate, while the strain rate sensitivity index increases with the increase of strain rate, and decreases with the increase of strain. The correlation coefficient（R） of constructed constitutive model is 0.997 7 and the average absolute relative error is 0.27%.

关键词

应变硬化特性应变率敏感性指数本构模型

Keywords

Strain hardening characteristicsStrain rate sensitivity indexConstitutive model

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