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Compressive mechanical properties of metal fiber sintered sheets at different strain rates

机译:不同应变率的金属纤维烧结板的压缩力学性能

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摘要

The quasi-static and dynamic mechanical behaviors of metal fiber sintered sheets (MFSSs) with six relative densities and three fiber diameters at the strain rates ranging from 0.001/s to 2000/s are investigated by using Universal Materials Testing System and split Hopkinson pressure bar (SHPB) system. The effects of relative density, strain rate on the yield strength and the energy absorption efficiency of MFSSs are evaluated. Finite element models (FEM) based on computed tomography (CT) images and idealized fiber networks are developed to simulate the compressive behavior at different strain rates. The measured responses of MFSSs are generally in agreement with that predicted by the 3D reconstructed model and the idealized model. Two deformation modes of MFSSs are explored based on stress wave theory and a critical speed is calculated to differentiate the two modes. Finally, an idealized lapping network is proposed to explore the compatibility condition of the geometrical characteristics and the effect of the strain rate and relative density on the mechanical behavior MFSSs.
机译:通过使用通用材料测试系统和分裂的Hopkinson压力棒来研究具有六个相对密度的金属纤维烧结片(MFSS)的金属纤维烧结片(MFSS)的六个相对密度和三个纤维直径,并分裂(SHPB)系统。评价相对密度,应变率对屈服强度和MFSSS的能量吸收效率的影响。基于计算机断层扫描(CT)图像和理想化光纤网络的有限元模型(FEM)是开发的,以模拟不同应变率的压缩行为。 MFSSS的测量响应通常与3D重建模型和理想模型预测的那一致。基于应力波理论探索了两个MFSS的变形模式,并计算临界速度以区分两种模式。最后,提出了理想化的研磨网络来探讨几何特征的兼容性条件以及应变率和相对密度对机械行为MFSSS的影响。

著录项

  • 来源
    《Composite Structures》 |2020年第2期|111703.1-111703.17|共17页
  • 作者

    Liu Ge; Song Weidong; Li Peifeng;

  • 作者单位

    Beijing Inst Technol State Key Lab Explos Sci & Technol Beijing 100081 Peoples R China;

    Beijing Inst Technol State Key Lab Explos Sci & Technol Beijing 100081 Peoples R China;

    Univ Glasgow Sch Engn Glasgow G11 6BZ Lanark Scotland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Strain rate effect; Fiber network; Compression; Yield strength; Deformation mode;

    机译:应变率效应;光纤网络;压缩;屈服强度;变形模式;

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