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鉭鎢合金動(dòng)態(tài)力學(xué)行為及其本構(gòu)模型研究
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南京理工大學(xué)機(jī)械工程學(xué)院,南京理工大學(xué)機(jī)械工程學(xué)院,南洋理工大學(xué),南京理工大學(xué),南京理工大學(xué),南京理工大學(xué),中國(guó)兵器科學(xué)研究院寧波分院

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TG 146.4

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南京理工大學(xué)紫金之星項(xiàng)目資助


Dynamic behavior and constitutive model for two tantalum-tungsten alloys under elevated strain rates
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School of Mechanical Engineering, Nanjing University of Science & Technology,School of Mechanical Engineering, Nanjing University of Science & Technology,,,,,

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    摘要:

    本文對(duì)兩種鉭鎢合金（Ta-2.5W和Ta-10W，鎢的質(zhì)量分?jǐn)?shù)分別為2.5 %和10 %）的準(zhǔn)靜態(tài)和動(dòng)態(tài)變形行為進(jìn)行了系統(tǒng)研究。根據(jù)準(zhǔn)靜態(tài)壓縮實(shí)驗(yàn)、霍普金森壓桿（SHPB）實(shí)驗(yàn)結(jié)果，表明兩種鉭鎢合金的屈服應(yīng)力對(duì)加載應(yīng)變率和鎢的含量較為敏感，并擬合得到了兩種鉭鎢合金的JC本構(gòu)模型。其次，為驗(yàn)證本構(gòu)模型的合理性，開(kāi)展了泰勒撞擊實(shí)驗(yàn)和數(shù)值模擬研究，應(yīng)變率范圍為103~104 s-1，數(shù)值模擬得到的泰勒桿側(cè)輪廓與撞擊端面輪廓與實(shí)驗(yàn)吻合較好。最后，為研究鉭鎢合金變形后的細(xì)觀特性，對(duì)桿件進(jìn)行了光學(xué)顯微照片分析。本文的研究方法與結(jié)果可為材料本構(gòu)關(guān)系的確定提供借鑒。

    Abstract:

    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.

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高飛,張先鋒,Serjouei Ahmad,王明洋,李磊,熊瑋,張將.鉭鎢合金動(dòng)態(tài)力學(xué)行為及其本構(gòu)模型研究[J].稀有金屬材料與工程,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.]
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  • 收稿日期:2015-10-11
  • 最后修改日期:2015-12-11
  • 錄用日期:2016-01-14
  • 在線發(fā)布日期: 2017-12-01
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