| 陈军红,张方举*,郭玲梅,谢若泽,徐伟芳.预紧力对G50动态拉伸实验结果的影响研究[J].实验力学,2022,37(6):881~888 |
| 预紧力对G50动态拉伸实验结果的影响研究 |
| 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：10.7520/1001-4888-21-306 |
| 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); 中物院创新与发展基金(CX20210031) |
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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。在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，利用改进后的分离式霍普金森拉杆开展了G50材料动态拉伸力学性能实验，并研究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振荡，通过应力应变曲线无法有效获取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，透射波振荡逐渐减弱，当预紧力达到临界值后，透射波振荡基本消失，通过处理入射波、反射波和透射波能获得较为光滑的应力应变曲线以及材料屈服应力及应变硬化等信息。 |
| 英文摘要: |
| The bolted joints are widely used in 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 can be easily obtained. |
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