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- W837091710 abstract "An advanced numerical procedure based on imaging of the material microstructure (Image-Based Finite Element Method or Image-Based FEM ) was extended and applied to model thethermomechanical behaviour of novel materials for fusion applications. Two tungsten basedheterogeneous materials with different random morphologies have been chosen as challeng-ing case studies: 1) a two-phase mixed ductile-brittle W/CuCr1Zr composite and 2) vacuumplasma-sprayed tungsten (VPS-W 75 vol.%), a porous coating system with complex dual-scalemicrostructure. Both materials are designed for the future fusion reactor DEMO: W/CuCr1Zras main constituent of a layered functionally graded joint between plasma-facing armor andheat sink whereas VPS-W for covering the first wall of the reactor vessel in direct contact withthe plasma. The primary focus of this work was to investigate the mesoscopic material behaviour and thelinkage to the macroscopic response in modeling failure and heat-transfer. Particular care wastaken in validating and integrating simulation findings with experimental inputs. The solutionof the local thermomechanical behaviour directly on the real material microstructure enabledmeaningful insights into the complex failure mechanism of both materials. For W/CuCr1Zr fullmacroscopic stress-strain curves including the softening and failure part could be simulated andcompared with experimental ones at different temperatures, finding an overall good agreement.The comparison of simulated and experimental macroscopic behaviour of plastic deformationand rupture also showed the possibility to indirectly estimate micro- and mesoscale materialparameters. Both heat conduction and elastic behaviour of VPS-W have been extensively investigated.New capabilities of the Image-Based FEM could be shown: decomposition of the heat transferreduction as due to the individual morphological phases and back-fitting of the reduced stiffnessat interlamellar boundaries. The microstructure of VPS-W was included in planar as well as in three-dimensional models.In order to image the three-dimensional microstructure of the coating a synchrotron microto-mography was necessary. Because of the strong X-rays absorption from W, the measurementwas a technical challenge. The tomographic reconstruction of a heterogeneous material whereW has the main volume fraction required the design of a special sample geometry and the op-timization of several beam parameters at a high-energy beamline of the European SynchrotronRadiation Facility in Grenoble." @default.
- W837091710 created "2016-06-24" @default.
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- W837091710 date "2011-04-11" @default.
- W837091710 modified "2023-09-27" @default.
- W837091710 title "Thermomechanical behaviour of two heterogeneous tungsten materials via 2D and 3D image-based FEM" @default.
- W837091710 hasPublicationYear "2011" @default.
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