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预紧力对G50动态拉伸实验结果影响研究
The effect of preload on the dynamic tensile test results of G50 alloy
投稿时间:2021-12-30  修订日期:2022-06-09
DOI:
中文关键词:  动态拉伸  螺纹连接  预紧力  应力波传播  屈服应力
英文关键词:dynamic tension  bolted joint  preload  wave propagation  yield stress
基金项目:国家自然科学基金(11602257)
作者单位邮编
陈军红 中国工程物理研究院总体工程研究所 621999
张方举 中国工程物理研究院总体工程研究所 621999
郭玲梅 中国工程物理研究院总体工程研究所 621999
谢若泽 中国工程物理研究院总体工程研究所 621999
徐伟芳 中国工程物理研究院总体工程研究所 621999
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中文摘要:
      螺纹连接是动态拉伸实验中常用的连接方式,试样与波导杆之间连接的松紧程度会对测试结果产生显著影响。基于传统分离式霍普金森拉杆的基础上设计了试样预紧力施加装置,开展了G50材料动态拉伸力学性能实验,讨论了预紧力大小对测试结果的影响。结果表明:未施加预紧力时,在加载初期,波的弥散效应使得透射波出现剧烈震荡,得到的应力应变曲线无法获得试样的屈服应力等信息。随着预紧力的增加,波的弥散效应得到改善,透射波震荡逐渐减弱,当预紧力达到临界值后,透射波震荡基本消失,能获得较为光滑的应力应变曲线和材料屈服应力及应变硬化信息。
英文摘要:
      The bolted joints are widely used in the dynamic tensile tests. The test results are significantly affected by the joint condition between the specimen and the bars. Based on the traditional split Hopkinson tensile bar, a tightening device was designed to study the effect of preload on the test results. The dynamic tensile tests were carried out on the G50 alloy using this device. It was found that without the preload, significant fluctuation appeared in the transmitted wave due to the dispersion of the elastic wave, which resulted in the difficult obtainment of the yield stress. Under preloading, the dispersion of the elastic wave changed better and the fluctuation in the transmitted became weak. Once the preload achieved a critical value, the fluctuation disappeared which resulted in a smooth strain-stress curve. From these curves, the dynamic tensile properties such as yield stress and strain-hardening behavior could be easily obtained.
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