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首页> 外文期刊>Materials Science and Engineering >Elastoplastic properties of transversely isotropic sintered metal fiber sheets
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Elastoplastic properties of transversely isotropic sintered metal fiber sheets

机译：横观各向同性烧结金属纤维板的弹塑性性能

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摘要

Sintering of layered metal fiber sheets produces a structured, tunable, paper-like material that holds promise for thermal and biomaterial applications. Particularly promising for these areas is a material system synthesized by the sequential-overlap method, which produces a networked, transversely isotropic open cell porous material. Engineering application of these materials has been limited due in part to uncertainty about their mechanical responses. Here, we present a comprehensive structural and mechanical characterization of these materials, and define a modeling framework suitable for engineering design. X-ray tomography revealed a layered structure with an isotropic fiber distribution within each layer. In-plane uniaxial compression and tension tests revealed a linear dependence of Young's modulus and yield strength upon relative fiber density. Out-of-plane tests, however, revealed much lower Young's modulus and strength, with quartic and cubic dependence upon relative density, respectively. Fiber fracture was the dominant mode of failure for tension within the "in-plane" directions of the fiber layers, and fiber decohesion was the dominant mode of failure for tension applied in the "out-of-plane" direction, normal to the layers. Models based upon dispersions of beams predicted both in-plane and out-of-plane elastoplastic properties as a function of the relative density of fibers. These models provide a foundation for mechanical design with and optimization of these materials for a broad range of potential applications.
机译：层状金属纤维片的烧结产生结构化，可调谐的纸状材料，有望用于热和生物材料应用。对于这些领域，特别有希望的是通过顺序重叠法合成的材料系统，该系统可生成网状，横向各向同性的开孔多孔材料。这些材料的工程应用受到限制，部分原因是其机械响应的不确定性。在这里，我们介绍了这些材料的全面结构和机械特性，并定义了适合工程设计的建模框架。 X射线断层扫描显示层状结构，各层内各向同性纤维分布。面内单轴压缩和拉伸试验表明，杨氏模量和屈服强度与相对纤维密度呈线性关系。然而，平面外测试显示出较低的杨氏模量和强度，分别对应于相对密度的四次和三次依赖性。纤维断裂是纤维层在“平面内”方向上拉伸的主要破坏方式，而纤维内聚力是在垂直于层的“平面外”方向上施加的拉伸的主要破坏方式。 。基于光束色散的模型预测面内和面外弹塑性特性是纤维相对密度的函数。这些模型为针对各种潜在应用的这些材料的机械设计和优化提供了基础。

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  • 来源
    《Materials Science and Engineering》 |2016年第26期|308-319|共12页
  • 作者

    T.F. Zhao; C.Q. Chen; Z.C. Deng;

  • 作者单位

    School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, PR China;

    Department of Engineering Mechanics and Center for Nano and Micro Mechanics, AML, Tsinghua University, Beijing 100084, PR China;

    School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, PR China,State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116024, PR China;

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

    Metal fiber networks; Transversely isotropic; Elastoplastic properties; Uniaxial test; Tomography;

    机译：金属纤维网络;横向各向同性;弹塑性单轴测试;断层扫描;

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