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首页> 外文期刊>Materials Science and Engineering >Formation mechanism of a plateau stress region during dynamic compression of porous iron: Interaction between oriented cylindrical pores and deformation twins
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Formation mechanism of a plateau stress region during dynamic compression of porous iron: Interaction between oriented cylindrical pores and deformation twins

机译：多孔铁动态压缩过程中平台应力区的形成机理：定向圆柱孔与变形孪晶之间的相互作用

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摘要

Dynamic and quasi-static compressions of porous copper and iron with cylindrical unidirectional pores were investigated at 298 and 77 K, with a focus on the effect of the interaction between the cylindrical pores and the deformation twins on the appearance of a plateau stress region in the stress-strain curves where the deformation proceeds at almost constant stress. The dynamic and quasi-static compressions were examined using the split Hopkinson pressure bar method and a universal testing machine, respectively. When porous copper undergoes dynamic (298 and 77 K) and quasi-static (298 K) compressions parallel to its cylindrical pores, the flow stresses increase monotonically with an increase in the strain. This is due to a homogeneous slip deformation originating from the high mobilities of the dislocations. However, when porous iron undergoes dynamic compression parallel to its pores at 298 K, macroscopically localized deformation bands analogous to bucking deformation occur, owing to the interaction between the oriented cylindrical pores and the deformation twins. This interaction acts as a trigger for the deformation band formation. As a result, the work hardening rate decreases drastically. Thus, in the case of dynamic parallel compression of porous iron at 298 K, a plateau stress region with a high stress (～300 MPa) and a wide strain range (of up to ～45%) appears. Because of this, the absorption of high-impact energy six times that can be absorbed by commercial aluminum foam with isotropic pores is achieved.
机译：研究了在298和77 K时具有圆柱形单向孔的多孔铜和铁的动态和准静态压缩，重点研究了圆柱形孔与形变孪晶之间相互作用对高原应力区出现的影响。应力-应变曲线，其中变形在几乎恒定的应力下进行。分别使用分开的Hopkinson压力棒法和通用试验机检查了动态和准静态压缩。当多孔铜平行于其圆柱孔经历动态（298和77 K）和准静态（298 K）压缩时，流动应力随着应变的增加而单调增加。这是由于位错的高迁移率引起的均匀滑动变形。但是，当多孔铁平行于其孔在298 K处经受动态压缩时，由于定向圆柱孔与形变孪晶之间的相互作用，出现了类似于屈曲形变的宏观局部形变带。这种相互作用是形变带形成的触发。结果，加工硬化率急剧降低。因此，在多孔铁在298 K下动态平行压缩的情况下，会出现高应力（〜300 MPa）和宽应变范围（高达〜45％）的平台应力区。因此，实现了高冲击能量的吸收，是具有各向同性孔的商用泡沫铝吸收的六倍。

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  • 来源
    《Materials Science and Engineering》 |2014年第3期|150-158|共9页
  • 作者

    M. Tane; F. Zhao; Y.H. Song; H. Nakajima;

  • 作者单位

    The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;

    The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;

    The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;

    The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan,The Wakasa Wan Energy Research Center, 64-52-1 Nagatani, Tsuruga, Fukui 914-0192, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mechanical characterization; Porous materials; Twinning; Plasticity;

    机译：机械特性多孔材料孪生;可塑性;

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