Numerical Investigation of the Fracture Behavior of Tungsten at the Micro Scale
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.
Micro Cantilever. Single Tungsten Crystal Fracture Toughness FE Model Crystal Plasticity
Christoph Bohnert Sabine M.Weygand Nicola J. Schmitt Ruth Schwaiger Oliver Kraft
Faculty of Mechanical Engineering and Mechatronics(MMT),Karlsruhe University of Applied Sciences,Mol Faculty of Mechanical Engineering and Mechatronics(MMT),Karlsruhe University of Applied Sciences,Mol Institute for Applied Materials(IAM),Karlsruhe Institute of Technology(KIT),Hermann-von-Helmholtz-Pl
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）