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,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.]
钽钨合金动态力学行为及其本构模型研究
投稿时间:2015-10-11  修订日期:2015-12-11
中文关键词:  钽钨合金  霍普金森压杆  动态行为  Taylor 冲击  本构模型
基金项目:南京理工大学紫金之星项目资助
中文摘要:
      本文对两种钽钨合金(Ta-2.5W和Ta-10W,钨的质量分数分别为2.5 %和10 %)的准静态和动态变形行为进行了系统研究。根据准静态压缩实验、霍普金森压杆(SHPB)实验结果,表明两种钽钨合金的屈服应力对加载应变率和钨的含量较为敏感,并拟合得到了两种钽钨合金的JC本构模型。其次,为验证本构模型的合理性,开展了泰勒撞击实验和数值模拟研究,应变率范围为103~104 s-1,数值模拟得到的泰勒杆侧轮廓与撞击端面轮廓与实验吻合较好。最后,为研究钽钨合金变形后的细观特性,对杆件进行了光学显微照片分析。本文的研究方法与结果可为材料本构关系的确定提供借鉴。
Dynamic behavior and constitutive model for two tantalum-tungsten alloys under elevated strain rates
英文关键词:Tantalum-tungsten alloys  SHPB  dynamic behavior  Taylor impact  constitutive model
英文摘要:
      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.
作者单位E-mail
高飞 南京理工大学机械工程学院 gaofei5257@163.com 
张先锋 南京理工大学机械工程学院 lynx@mail.njust.edu.cn 
Serjouei Ahmad 南洋理工大学  
王明洋 南京理工大学  
李磊 南京理工大学  
熊玮 南京理工大学  
张将 中国兵器科学研究院宁波分院  
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