Pulse shaping techniques for testing elastic-plastic materials with a split Hopkinson pressure bar
Pulse shaping techniques for testing elastic-plastic materials with a split Hopkinson pressure bar
复制标题
DOI：
10.1007/bf02428192
复制
发表时间：
2005-04
影响因子：
2.4
通讯作者：
D. Frew;M. Forrestal;Weinong Chen
中科院分区：
文献类型：
--
作者：
D. Frew;M. Forrestal;Weinong Chen
提出了用分离式Hopkinson压杆获得弹塑性材料压缩应力-应变数据的脉冲整形技术。对传统的分离式霍普金森压杆装置进行了改进，在入射杆的冲击面上放置了铜和钢的组合脉冲整形器。冲击杆冲击后，铜-钢脉冲整形器发生塑性变形，脉冲在入射杆中传播，使试件接近动应力平衡，在塑性响应区具有几乎恒定的应变率。我们给出的分析模型和数据表明，通过改变脉冲整形器的几何形状和冲击速度，可以获得大范围的入射应变脉冲。作为应用，我们给出了4340RC43钢的压缩应力-应变数据。
We present pulse shaping techniques to obtain compressive stress-strain data for elastic-plastic materials with a split Hopkinson pressure bar. The conventional split Hopkinson pressure bar apparatus is modified by placing a combination of copper and steel pulse shapers on the impact surface of the incident bar. After impact by the striker bar, the copper-steel pulse shaper deforms plastically and spreads the pulse in the incident bar so that the sample is nearly in dynamic stress equilibrium and has a nearly constant strain rate in the plastic response region. We present analytical models and data that show a broad range of incident strain pulses can be obtained by varying the pulse shaper geometry and striking velocity. For an application, we present compressive stress-strain data for 4340 Rc43 steel.