Extended finite element method J-integral Electron beam irradiation tests a b s t r a c t In this work, damage behavior of tungsten under high heat flux loads was investigated both numerically and experimentally assuming a single heat pulse with duration of 0.5 s. Finite element simulations revealed that the thermal steady state was reached within several milliseconds after the onset of a heat flux pulse and tensile residual stress was produced during cooling providing the driving force for crack growth. The crack initiation and growth simulations and J-integral calculation at crack tips delivered consistent results on cracking mechanism. Electron beam irradiation tests on tungsten samples were performed, which confirmed the predicted damage behavior.
This paper introduces tape casting as a new route for the production of isotropic and fine-grained tungsten components. Microstructural and thermal properties of tape cast tungsten samples are determined. Thermal shock behavior according to the thermo-cyclic loading of standing X-ray anodes is investigated and compared to the behavior of a rolled tungsten grade. The development of surface roughness during the thermal shock loading is discussed in relation to the development of the grain structure and crack pattern. The finegrained and stable microstructure of the tape cast material exhibits less roughening under such test conditions.
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