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Numerical Investigation of the Fracture Behavior of Tungsten at the Micro Scale

机译：微尺度钨骨折行为的数值研究

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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：由于其高熔点，钨的可能性是在未来的能源应用中用作结构材料。然而，其中一个挑战是处理室温下钨的脆性，其中多晶钨的骨折行为受到晶粒结构和质地的强烈影响以及样品尺寸。本作工作的目的是在单晶钨微悬臂中的凹口中的数值分析应力场。提出了三维有限元模型，其表示悬臂的微结构，其由纳米压纳装置偏转。该研究解决了实验缺点，例如，在实验设置纯模式下，我无法实现。由于压痕和微观之间的摩擦，出现横向力并且直接在凹口处的应力场上产生冲击。 Fe模型用于研究摩擦系数对横向力和应力强度因子的影响。仿真揭示了摩擦系数上升的横向力线性增加并且应力强度因子降低。

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