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高飞,张先锋,Serjouei Ahmad,王明洋,李磊,熊玮,张将.钽钨合金动态力学行为及其本构模型研究[J].稀有金属材料与工程(英文),2017,46(10):2753~2762.[Gao Fei,Zhang Xianfeng,Serjouei Ahmad,Wang Mingyang,Li Lei,Xiong Wei,Zhang Jiang.Dynamic behavior and constitutive model for two tantalum-tungsten alloys under elevated strain rates[J].Rare Metal Materials and Engineering,2017,46(10):2753~2762.]
Dynamic behavior and constitutive model for two tantalum-tungsten alloys under elevated strain rates
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Received:October 11, 2015  Revised:December 11, 2015
Key words: Tantalum-tungsten alloys  SHPB  dynamic behavior  Taylor impact  constitutive model
Foundation item:南京理工大学紫金之星项目资助
Author NameAffiliationE-mail
Gao Fei School of Mechanical Engineering, Nanjing University of Science & Technology gaofei5257@163.com 
Zhang Xianfeng School of Mechanical Engineering, Nanjing University of Science & Technology lynx@mail.njust.edu.cn 
Serjouei Ahmad 南洋理工大学  
Wang Mingyang 南京理工大学  
Li Lei 南京理工大学  
Xiong Wei 南京理工大学  
Zhang Jiang 中国兵器科学研究院宁波分院  
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      In this paper, a systematic investigation on the quasi-static and dynamic deformation behavior of two tantalum-tungsten (Ta-W) alloys, namely Ta-2.5 weight percentage W (Ta-2.5W) and Ta-10 weight percentage W (Ta-10W), is presented. It is shown based on the performed SHPB and Taylor impact tests that the yield stresses of tantalum-tungsten alloys exhibit sensitivity to strain rate and W content. Based on the quasi-static and high strain-rate experimental data, the material constants in Johnson-Cook (JC) model were obtained for the two Ta-W alloys. In addition, validation of the derived constitutive model is carried out through comparison of Taylor impact inhomogeneous deformations under high strain rate (103~104 s-1), obtained from simulations, with their experimental counterparts. It is shown that the simulation results agree well with post-test geometries in terms of side profiles and impact-interface footprints for Taylor impact tests. To bridge the different spatial scale involved in the process of tantalum-tungsten alloy deformation, a meso-scale research is proposed via a optical microscope (OM) image analysis. The results presented in this paper, provide new insights into the mechanisms suitable for the constitutive relations determination process.