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  • Fracture Toughness of Co4Sb12 and In0.1Co4Sb12 Thermoelectric Skutterudites Evaluated by Three Methods

    Creator:
    Eilertsen, James, Subramanian, M. A., and Kruzic, J. J.
    Abstract:
    Interstitially filled skutterudites are a promising class of state-of-the-art thermoelectric materials. Although thermoelectrics are exposed to significant thermal stresses, little information is known about the fracture toughness of interstitially doped skutterudites. This work explores the fracture toughness of undoped Co₄Sb₁₂ and indium doped In₀.₁Co₄Sb₁₂ skutterudites using three methods: 1) Vickers...
    Resource Type:
    Article
    Full Text:
    Fracture Toughness of Co4Sb12 and In0.1Co4Sb12 Thermoelectric Skutterudites Evaluated by Three Methods

  • Fracture toughness of void-site-filled skutterudites

    Creator:
    Eilertsen, James S.
    Abstract:
    Thermoelectric materials are playing an increasingly significant role in the global effort to develop sustainable energy technologies. Consequently, the demand for materials with greater thermoelectric efficiency has stimulated the development of state-of-the-art interstitially doped skutterudite-based materials. However, since intermetallics are often embrittled by interstitial substitution, optimal skutterudite-based device design, manufacture,...
    Resource Type:
    Masters Thesis
    Full Text:
    . Fracture Toughness of Void-Site-Filled Skutterudites by James S. Eilertsen A THESIS submitted

  • Novel nanocomposite synthesis for high-performance thermoelectrics

    Creator:
    Eilertsen, James S.
    Abstract:
    Thermoelectric materials are playing a larger role in the global effort to develop diverse, efficient, and sustainable energy technologies: primarily through power-generating thermoelectric modules. The principal components of thermoelectric modules are solid-state thermoelectric materials – typically heavily doped semiconductors – that convert heat directly into electricity. However, this conversion efficiency...
    Resource Type:
    Dissertation
    Full Text:
    Engineering Thesis, Fracture Toughness of Void-Site-Filled Skutterudites………………......…104

  • A comparison of experimental mode I analysis methods for the interlaminar fracture toughness characterization of graphite/epoxy composite materials

    Creator:
    Keary, Paul Edward
    Abstract:
    Three approaches for evaluating mode I interlaminar strain energy release rates in graphite/epoxy composites were compared using experimental data from double cantilever beam specimens. Expressions for evaluating strain energy release rates were arrived at based on assumptions regarding specimen geometry and material behavior. The calculations included the direct method of...
    Resource Type:
    Masters Thesis
    Full Text:
    COMPARISON OF EXPERIMENTAL MODE I ANALYSIS METHODS FOR THE INTERLAMINAR FRACTURE TOUGHNESS CHARACTERIZATION

  • Rapid Microwave Synthesis of Indium Filled Skutterudites: An energy efficient route to high performance thermoelectric materials

    Creator:
    Biswas, Krishnendu, Muir, Sean, and Subramanian, Mas A.
    Abstract:
    Filled skutterudites are promising thermoelectric materials due to reduced thermal conductivity upon inserting a guest atom or 'rattler' into the CoSb₃ structure. By using an indium rattler dimensionless Figure of Merit (ZT) values > 1 at 650 K have been reported. The conventional synthesis of these compounds typically takes several...
    Resource Type:
    Article
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    ]. This method involves mixing stoichiometric amounts of In, Co and Sb and calcining at 610 °C for 12

  • The fracture toughness of medium density fiberboard and other fiber bridging composites

    Creator:
    Matsumoto, Noah T.
    Abstract:
    In many composites, fiber bridging develops as part of the fracture process. Fiber bridging invalidates many toughness evaluation methods such as the ASTM E399 and complicates the identification of crack length, which is a necessary parameter in energy methods. In order to measure the toughness of fiber bridging composites, an...
    Resource Type:
    Masters Thesis
    Full Text:
    inherent way in which MDF fractures makes evaluation of its fracture toughness difficult and will be

  • Effect of Imprinting Process on Fracture Behavior of a Zr-based Bulk Metallic Glass

    Creator:
    Li, Bosong
    Abstract:
    Bulk metallic glasses (BMGs) are relatively new amorphous materials that have received much attention in recent years. Rapid cooling methods from the liquid state provides the possibility to bypass crystallization during solidification. Due to the lack of crystal defects such as grain boundaries and dislocations, BMGs can have some special...
    Resource Type:
    Masters Thesis
    Full Text:
    toughness values suggest brittle nature of ceramics and glasses. In contrast, fracture toughness values

  • Crack Penetration and Deflection Behavior at Interfaces

    Creator:
    Alam, Mahabub
    Abstract:
    This study computationally and experimentally examines the mechanisms of crack penetration, deflection and the transition between penetration and deflection. The finite element analysis based computational modeling work used strength-and-energy based cohesive-zone approach to study the effect of dimensionless parameters (e.g., interfacial incident angle, fracture-length scale, and normalized toughness) on penetration/deflection...
    Resource Type:
    Dissertation
    Full Text:
    fracture length scale and fixed normalized toughness and a range of material fracture length scales

  • A relationship between wave dispersion and fracture strength for a composite material

    Creator:
    Ilcewicz, Larry Bert
    Abstract:
    Wave dispersion and fracture are phenomena that involve. mechanisms triggered at the scale of a material's internal structure. Experiments were performed with a candidate material to judge the hypothesis that wave dispersion measurements can be used to nondestructively predict fracture strength. Wood-based particleboard was chosen as the candidate material because...
    Resource Type:
    Dissertation
    Full Text:
    ultrasonics. Wave dispersion and fracture were studied in detail for the weak direction of particleboard

  • The effect of elevated temperature exposure on the fracture toughness of solid wood and structural wood composites

    Creator:
    Sinha, Arijit, Nairn, John A., and Gupta, Rakesh
    Abstract:
    Fracture toughness of wood and wood composites has traditionally been characterized by a stress intensity factor, an initiation strain energy release rate (G init) or a total energy to fracture (G f). These parameters provide incomplete fracture characterization for these materials because the toughness changes as the crack propagates. Thus,...
    Resource Type:
    Article
    Full Text:
    Abstract Fracture toughness of wood and wood composites has traditionally been characterized by a stress