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Thermomechanical effects during impact testing of WC/Co composite material

机译：WC / Co复合材料的冲击测试过程中的热机械效应

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摘要

WC/Co metal-matrix ceramic composites (MMCs) are used for manufacturing cutting and drilling tools, surgical tools, mill inserts, jet engines, and other high-responsibility structures. The combination of a phase of hard wolfram carbide (WC) grains with a metallic ductile interface of cobalt (Co) yields a complex microstructure with significantly different mechanical properties of the phases.The aim of this study is to investigate the thermomechanical behavior of the MMC polycrystalline material with ductile binders under impact conditions. An adiabatic and coupled thermomechanical analysis of the WC/Co composite under impact loading is performed using FEM. The heat conduction is considered in the analysis in order to capture heat transfer in the polycrystalline structure, i.e. between the grains and the grain boundaries (GBs). The Johnson-Cook yield function is used in the constitutive model of the ductile Co interface, while the WC phase is linear elastic. The motivation comes from the observation that the heat conductivity effect is often omitted, even in recent papers **[75]. Significant differences between temperatures and plastic strains in the adiabatic and coupled solutions are observed, which leads to the main conclusion that the adiabatic solution should not be used for assessing the impact response of the composite material.
机译：WC / Co金属基陶瓷复合材料（MMC）用于制造切削和钻孔工具，外科手术工具，铣削刀片，喷气发动机和其他高响应性结构。硬质碳化钨（WC）晶粒与钴的金属延性界面相的结合产生了一种复杂的微结构，具有明显不同的相机械性能。本研究的目的是研究MMC的热机械行为在冲击条件下具有延展性粘合剂的多晶材料。使用有限元法对冲击载荷下的WC / Co复合材料进行了绝热和热力学耦合分析。在分析中考虑导热，以便捕获多晶结构中的热传递，即在晶粒与晶界（GB）之间的传热。 Johnson-Cook屈服函数用于延性Co界面的本构模型，而WC相为线性弹性。动力来自于这样的观察，即即使在最近的论文中[75]，也常常忽略了热传导效应。在绝热溶液和耦合溶液中观察到温度和塑性应变之间的显着差异，这得出主要结论，绝热溶液不应用于评估复合材料的冲击响应。

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  • 来源
    《Composite Structures》 |2020年第6期|112054.1-112054.25|共25页
  • 作者

  • 作者单位

    Polish Acad Sci Inst Fundamental Technol Res Ul Pawinskiego 5B PL-02106 Warsaw Poland;

    Lublin Univ Technol Dept Solid Mech Nadbystrzycka 40 Str PL-20865 Lublin Poland;

  • 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

    Metal-ceramic composite; Impact; Coupled problem; Thermomechanics; Ductile interface;

    机译：金属陶瓷复合材料;影响;耦合问题;热力学;延性界面;

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