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兵工学报 ›› 2015, Vol. 36 ›› Issue (9): 1750-1756.doi: 10.3969/j.issn.1000-1093.2015.09.021

• 论文 • 上一篇    下一篇

基于Taylor杆的Ti-5553钛合金动态特性研究

杜文文1,2,王琳1,2,赵登辉3,智茂盛1,2,徐欣1,2   

  1. (1.北京理工大学 材料学院, 北京 100081; 2.北京理工大学 冲击环境材料技术国家级重点实验室, 北京 100081;
  • 收稿日期:2014-05-20 修回日期:2014-05-20 上线日期:2015-11-20
  • 通讯作者: 杜文文 E-mail:bitwwd@163.com
  • 作者简介:杜文文(1991—),女,硕士研究生

Study of the Dynamic Behaviors of Ti-5553 Alloy Based on Taylor Bar Impacting Test

DU Wen-wen1,2,WANG Lin1,2,ZHAO Deng-hui3,ZHI Mao-sheng1,2,XU Xin1,2   

  1. (1.School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;2.National Key Laboratory of Science and Technology on Materials under Shock and Impact,Beijing Institute of Technology,Beijing 100081,China; 3.China Ordnance Industrial Standardization Research Institute,Beijing 100089,China)
  • Received:2014-05-20 Revised:2014-05-20 Online:2015-11-20
  • Contact: DU Wen-wen E-mail:bitwwd@163.com

摘要: 利用Taylor杆冲击实验与数值模拟方法研究了Ti-5553钛合金在高应变率冲击下的动态行为。Ti-5553合金在两种热处理工艺处理后获得了不同准静态力学性能的等轴组织和双态组织。在泰勒杆冲击实验的基础上,应用ANSYS/LS-DYNA有限元分析软件研究了材料参数屈服强度值σs和失效应变值εf的变化对Taylor杆冲击能量、速度、加速度等过程参量和冲击结果的影响,将σs值设定为1 170~1 400 MPa,εf设定为0.1~0.8. 研究结果表明:屈服强度值的变化对冲击前后能量、速度、加速度的改变量影响较小。随着屈服强度值的增大,冲击过程中能量、速度、加速度的变化速率有所增加,冲击后试样的应变量减小;失效应变值的变化对冲击过程量有明显影响;对等轴组织钛合金,εf<0.7时,随着失效应变值的增大,能量、速度、加速度的变化速率逐渐增大,试样冲击后几乎无回弹现象;当εf ≥0.7时,过程参量曲线全部重合,试样冲击后有明显回弹现象;当设定εf =0.75和εf =0.35时,等轴组织和双态组织钛合金分别符合真实Taylor杆冲击变形特征。

关键词: 固体力学, Ti5553合金, Taylor杆, 屈服应变, 失效应变

Abstract: The dynamic behaviors of Ti-5553 alloy under high strain rate are investigated by Taylor bar impact test and numerical simulation. Ti-5553 alloy achieves equal-axis microstructure and duplex microstructure with different mechanical properties after it is processed through two kinds of heat treatment processes. By means of numerical simulation with ANSYS/LS-DYNA software, the influences of yield stress σs and failure strain εf on the processing parameters and impact results,such as kinematic energy,velocity and acceleration, are studied on the base of Taylor bar impact tests. The yield stress is set to 1 170 ~1 400 MPa and the failure strain is set to 0.1~0.8. The experimental and numerical simulation results demonstrate that the value of yield stress has little influence on kinetic energy,velocity and acceleration during the Taylor impacting test. The higher the yield stress is,the lower the final strain of projectile is. The changing rates of energy,velocity and acceleration improve slightly. For Ti-5553 alloy with the equal-axis microstructure, the changing rates of energy,velocity and acceleration increase with strain rate for εf<0.7,and the projectile has no spring back. For εf ≥0.7,the curves of processing parameters coincide with each other and the projectiles spring back. When failure strains are defined as 0.75 and 0.35 for the equal-axis and duplex microstructure alloys, respectively,the numerical simulation results are in good accordance with the actual Taylor experimental results.

Key words: solid mechanics, Ti-5553 alloy, Taylor bar, yield stress, failure strain

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