钽钨合金动态力学行为及其本构模型研究（英文）

发布时间：2018-03-29 11:35

本文选题：钽钨合金　切入点：霍普金森压杆　出处：《稀有金属材料与工程》2017年10期

【摘要】：对2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2种钽钨合金的流动应力对加载应变率和钨的含量较为敏感,并拟合得到了2种钽钨合金的JC本构模型参数。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10~3~10~4 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。本研究方法与结果可为材料本构关系的确定提供借鉴。
[Abstract]:The quasi-static and dynamic deformation behaviors of Ta-2.5W and Ta-10W of two kinds of tantalum tungsten alloys were systematically studied. The experimental results of Hopkinson compression bar SHPBwere based on the quasi-static compression experiment, and the mass fraction of tungsten was 2.5% and 10%, respectively. It is shown that the flow stress of the two tantalum-tungsten alloys is sensitive to the loading strain rate and the tungsten content, and the parameters of the JC constitutive model of the two kinds of tantalum tungsten alloys are fitted. Secondly, to verify the rationality of the constitutive model, Taylor impact experiments and numerical simulation studies have been carried out. The strain rate ranges from 10 ~ (3) ~ 10 ~ (10) ~ (4) s ~ (-1) ~ (-1). The profile of Taylor bar side and the profile of impact end surface obtained by numerical simulation are in good agreement with the experimental results. Finally, in order to study the mesoscopic characteristics of tantalum and tungsten alloy after deformation, The method and results of this study can be used for reference in determining the constitutive relationship of the material.
【作者单位】：南京理工大学;南洋理工大学;中国兵器科学研究院宁波分院;
【基金】：the Zijin Intelligent Program,Nanjing University of Science and Technology(2013_ZJ_0101) Qing Lan Project of Jiangsu Province State Key Laboratory of Explosion Science and Technology(Beijing Institute of Technology)(KFJJ15-07M)
【分类号】：TG146.416

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