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Effects of annealing and specimen geometry on dynamic compression of a Zr-based bulk metallic glass

机译：退火和试样几何形状对Zr基大块金属玻璃动态压缩的影响

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摘要

High strain-rate compression experiments were performed with a split-Hopkinson pressure bar (SHPB) at 500-4000/s on cylindrical samples of a Zr-based bulk metallic glass (LM-1) in both the fully amorphous and annealed conditions. The effects of changes to the specimen geometry (i.e., LID ratio) and the material heat treatment [i.e., annealing versus amorphous (as-received)], on the peak stress, strain-to-failure, and failure behavior were determined with the aid of an in situ video obtained by using a high-speed digital camera in conjunction with the split-Hopkinson pressure bar (SHPB). Examination of the in situ video recordings and light optical microscopy showed that the failed samples revealed preferential failure initiating at the sample ends due to stress concentration at the sample-insert interface. A new insert design was developed using transient, elastic-plastic finite-element simulations to reduce the effects of these stress concentrations. SHPB testing, combined with in situ video, subsequently revealed that this new experimental configuration promoted failure within the gage length and away from the sample ends in the samples tested. Significant effects of specimen geometry, insert design, and annealing on the apparent values of the peak stress, strain-to-failure, and fracture behavior were exhibited.
机译：在完全无定形和退火条件下，对Zr基块状金属玻璃（LM-1）的圆柱形样品，采用裂口霍普金森压力棒（SHPB）以500-4000 / s的速度进行了高应变率压缩实验。样品几何形状（即LID比）的变化和材料热处理（即退火与非晶态（按原样）的变化）对峰值应力，应变破坏和破坏行为的影响可以通过使用通过使用高速数码相机和剖分式霍普金森压力杆（SHPB）一起获得的现场视频的帮助。对原位视频记录和光学显微镜的检查表明，由于样品-插入界面处的应力集中，失败的样品显示出在样品末端引发的优先失败。使用瞬态弹塑性有限元模拟开发了一种新的刀片设计，以减少这些应力集中的影响。 SHPB测试与原位视频相结合，随后揭示出，这种新的实验配置促进了量具长度内以及远离测试样品中样品末端的破坏。样品的几何形状，插入件设计和退火对峰值应力，应变失效和断裂行为的表观值产生了显着影响。

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  • 来源
    《Journal of Materials Research》 |2007年第2期|p.389-401|共13页
  • 作者

    George Sunny; John Lewandowski; Vikas Prakash;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7222;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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