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首页> 外文会议>13th International conference on fracture >Numerical Investigation of the Fracture Behavior of Tungsten at the Micro Scale
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Numerical Investigation of the Fracture Behavior of Tungsten at the Micro Scale

机译：钨在微观尺度上断裂行为的数值研究

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摘要

Due to its high melting point tungsten has the potential to be used as a structural material in future energy applications.However,one of the challenges is to deal with the brittleness of tungsten at room temperature.where the fracture behavior of polycrystalline tungsten is strongly influenced by the grain structure and texture as well as sample dimensions.The aim of the present work is to numerically analyze the stress field at a notch in a single crystal tungsten micro cantilever.A three dimensional finite element model is presented representing the microstructure of the cantilever which is deflected by a nanoindentation device.The study addresses experimental shortcomings as.for instance.in the experimental setup pure mode Ⅰ cannot be realized.Due to friction between indenter and microbeam.lateral forces arise and have an impact directly on the stress field at the notch.The FE model is used to study the influence of the friction coefficient on the lateral forces and on the stress intensity factor.The simulations reveal that with rising friction coefficient the lateral force increasing linearly and the stress intensity factor decreases.
机译：由于钨的熔点高，它有潜力在未来的能源应用中用作结构材料。然而，面临的挑战之一是应对室温下钨的脆性。在这种情况下，多晶钨的断裂行为受到严重影响。本研究的目的是对单晶钨微悬臂梁缺口处的应力场进行数值分析。提出了三维有限元模型，表示了悬臂梁的微观结构。该研究解决了实验缺陷，例如在实验装置中无法实现纯模式Ⅰ，由于压头和微束之间的摩擦，产生了侧向力，并直接影响了应力场。有限元模型用于研究摩擦系数对侧向力和侧向力的影响。仿真结果表明，随着摩擦系数的增大，横向力线性增加，应力强度因子减小。

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  • 来源
  • 会议地点 Beijing(CN)
  • 作者

    Christoph Bohnert; Sabine M.Weygand; Nicola J. Schmitt; Ruth Schwaiger; Oliver Kraft;

  • 作者单位

    Faculty of Mechanical Engineering and Mechatronics(MMT),Karlsruhe University of Applied Sciences,Moltkestr.30,76133 Karlsruhe,Germany;

    Institute for Applied Materials(IAM),Karlsruhe Institute of Technology(KIT),Hermann-von-Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen,Germany;

    Faculty of Mechanical Engineering and Mechatronics(MMT),Karlsruhe University of Applied Sciences,Moltkestr.30,76133 Karlsruhe,Germany;

    Institute for Applied Materials(IAM),Karlsruhe Institute of Technology(KIT),Hermann-von-Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen,Germany;

    Institute for Applied Materials(IAM),Karlsruhe Institute of Technology(KIT),Hermann-von-Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen,Germany;

    Institute for Applied Materials(IAM),Karlsruhe Institute of Technology(KIT),Hermann-von-Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen,Germany;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 断裂理论;
  • 关键词

    Micro Cantilever. Single Tungsten Crystal; Fracture Toughness; FE Model; Crystal Plasticity;

    机译：微悬臂。钨单晶断裂韧性有限元模型晶体可塑性;

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