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Showing 1 to 20 of 83 for “"functionally graded"”.
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Carbonation of Functionally Graded Concrete
In this thesis, the carbonation of functionally graded concrete is investigated through a combination of experimental and analytical approaches. The properties of functionally graded concrete vary throughout the cross-section to satisfy performance requirements in a resource-efficient manner. In …
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Properties of functionally graded concrete slabs
… Concurrently, research was being conducted into functionally-graded, or two-lift pavements. Two-lift pavements represent a significant advancement in the design of roadways as lower quality aggregates, such as recycled concrete aggregates (RCA) and fractionated recycled asphalt pavement (FRAP) …
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Fatigue crack propagation in functionally graded materials
Propagation of cracks in functionally graded materials (FGMs) under cyclic loading was investigated via experiments and finite element (FE) analysis. Alumina-epoxy composites with an interpenetrating-network structure and tailored spatial variation in composition were produced via a multi-step …
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Design, fabrication, and characterization of functionally graded materials
… the feasibility of fabricating custom designed, graded materials using Laser Metal Deposition (LMD) that will cater for functionality and unconventional repair. The ultimate goal of the project is to establish the versatility of LMD for fabricating advanced materials and tackling problems that …
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Fabrication, Characterization and Modeling of Functionally Graded Materials
… (PV) cells onto a substrate through a functionally graded material (FGM) with water tubes cast inside, through which water flow serves as both a heat sink and a solar heat collector. Due to the unique and graded material properties of FGMs, this novel design not only supplies efficient …
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Mixed-Mode Crack Propagation in Functionally Graded Materials
… parameters describing the crack tip fields in functionally graded materials (FGMs) include stress intensity factors (SIFs) and T-stress (non-singular stress). These two fracture parameters are important for determining the behavior of a crack under mixed-mode loading conditions in brittle FGMs …
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Characterization of functionally graded materials through fractal geometry
Functionally Graded Materials are the material systems whose properties vary spatially through the solid. These material systems are fairly new and though expensive to fabricate; they serve as excellent engineering materials for various applications. The material system we consider in this work is …
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Analysis of functionally graded material object representation methods
… these issues, several approaches to modeling Functionally Graded Material (FGM) objects are evaluated based on their memory requirements. Through this research, an information pathway for processing FGM objects based on image processing is proposed. This pathway establishes a clear separation …
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Structural and Vibration Analysis of Polymeric Functionally Graded Plates
Functionally graded materials (FGMs) are advanced engineered materials whereby material composition and properties vary spatially in the macroscopic length scale. Accurate analytical and numerical models for prediction of mechanical behaviour and damage of the FG plate are required as their …
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Design of functionally graded compliant mechanisms using topology optimization
… applies topology optimization to create feasible functionally graded complaint mechanism designs with the aim of improving structural performance compared to traditional homogeneous compliant mechanism designs. Structural performance is assessed with respect to mechanical/geometric advantage and …
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Algorithms for design and interrogation of functionally graded material solids
A Functionally Gradient Material (FGM) part is a 3D solid object that has varied local material composition that is defined by a specifically designed function. Recently, research has been performed at MIT in order to exploit the potential of creating FGM parts using a modern fabrication process, …
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A Mechanical and Histological Study of Functionally Graded Hydroxyapatite Implant Coatings
… study is to evaluate bone-implant interaction of functionally graded, thin film hydroxyapatite (HA) coatings in an animal model. The rationale for the graded coatings is such that they elicit different biological responses from different layers within the thin film (less than two microns). As such …
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Incorporating Functionally Graded Materials and Precipitation Hardening into Microstructure Sensitive Design
… methods of MSD are applied to the design of functionally graded materials. Analysis models are presented to allow the design of compliant derailleur for a case study and constraints are placed on the design. Several methods are presented for relating elements of the microstructure to the …
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Co-Extrusion of Cement -Based Materials to Achieve Functionally Graded Microstructure
Clay was explored to replace commonly used cellulose plasticizer in order to solve the problem of air voids associated with cellulose. The effect of clays on plasticizing cementitious pastes was evaluated by rheological and zeta potential measurements. Only zeta potential was found to be valuable …
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Galerkin Boundary Element Modeling of Three-Dimensional Functionally Graded Material Systems
Finally, new techniques of scientific visualization, which is an integral part of computational science research, are explored in the context of boundary element method. This investigation includes developing new modules for viewing the boundary and the domain data using modern visualization tools, …
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Cohesive zone modeling of fracture of sustainable and functionally graded concrete
… resistance, thermal resistance/insulation, etc. Functionally graded materials (FGMs) are one such material. This study investigates the fracture process of sustainable concrete, fiber reinforced concrete, and of functionally graded concrete slabs. Both two-dimensional and three-dimensional …
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Asphalt Pavement Aging and Temperature Dependent Properties Using Functionally Graded Viscoelastic Model
… Other application areas include simulation of functionally graded fiber-reinforced concrete, geotechnical materials, metal and metal composites at high temperatures, polymers, and several other naturally existing and engineered materials.
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Application and economic feasibility of functionally graded composite for lead-bismuth service
Use of materials in liquid Pb/Pb-Bi systems in the higher temperature (550°C-700°C) in advanced liquid metal cooled advanced reactor systems is limited by their corrosion resistance. To address this issue, an Fe-12Cr-2.55Si alloy system is being developed and researched, and when used along with …
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Diffusional stability studies of a T91/12Cr-2Si-Fe functionally graded composite
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2013.
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