Sökning: "functionally graded materials"
Hittade 5 avhandlingar innehållade orden functionally graded materials.
1. On crack growth in functionally graded materials
Sammanfattning : Stress intensity factors' behaviour is studied for long plane cracks interacting with a region of functionally graded elastic material. The region is assumed embedded into a large body treated as a homogeneous elastic continuum. LÄS MER
2. Tailoring structure and morphology during additive manufacturing of metallic components
Sammanfattning : The work described in this thesis explores the use of laser process parameters to functionalize the material properties by the control of microstructure and optimization of morphology in components by selective laser melting. The microstructure in amorphous and crystalline metallic alloy systems is influenced by changing the laser power density and scanning strategies respectively. LÄS MER
3. Development of Composition Gradients in Cemented Carbides
Sammanfattning : This thesis concerns the formation of tough surface zones, depleted of cubic carbo-nitrides, in cemented carbides. Several materials with varied phase compositions, binder phase volume fraction, and carbon content have been investigated. LÄS MER
4. Thermal residual stresses, hardness and microstructural characterisation of functionally graded WC-Co composites
Sammanfattning : Functionally graded materials (FGMs) incorporate gradual transitions in their microstructure and/or composition with distance. The gradients provide means to favourably engineer their thermomechanical properties by changing e.g., the local modulus, yield strength, state of residual stress etc. LÄS MER
5. Determination of residual stresses and mechanical properties using neutron, X-ray diffraction, micro- and nanoindentation techniques
Sammanfattning : The existence of residual stresses in engineering materials can significantly affect subsequent lifetime by augmenting or impeding failure. Consequently, for an accurate assessment of engineering lifetimes, there is a need to quantify residual stresses. LÄS MER