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  • Mechanistic aspects of fracture and fatigue in resin based dental restorative composites

    Creator:
    Shah, Minalben B.
    Abstract:
    For resin based dental restorative composites, one of the major challenges is to optimize the balance between mechanical and optical properties. Although fracture is the second leading cause of dental restorative failures, very limited mechanistic understanding exists on a microscopic level. In the present study, the fracture properties and mechanisms...
    Resource Type:
    Dissertation
    Full Text:
    , correction of stains and erosion, and alignment of teeth. Gold was the first dental restoration material

  • Investigation into the role of strength and toughness in composite materials with an angled incident crack

    Creator:
    Grimm, Brian A.
    Abstract:
    Understanding the mechanical behavior of composite materials requires extensive knowledge of fracture behavior as a crack approaches an interface between the bulk material and the reinforcement structure. Overall material toughness can be greatly influenced by the propensity of an impinging crack to propagate directly through the substrate or deflect along...
    Resource Type:
    Masters Thesis
    Full Text:
    knowledge of fracture behavior as a crack approaches an interface between the bulk material and the

  • An investigation of transition from penetration to deflection in the fracture of bi-material interfaces

    Creator:
    Strom, Joshua L.
    Abstract:
    The problem of determining whether a crack impinging on an interface will penetrate into the substrate or deflect along the interface is vital to the effective design of layered and composite material systems. Of particular interest is the transition between crack propagation by penetration through an interface and deflection along...
    Resource Type:
    Masters Thesis
    Full Text:
    Title: An Investigation of Transition from Penetration to Deflection in the Fracture of Bi-Material

  • Bioactive glass filled resin composites : mechanical properties and resistance to secondary tooth decay

    Creator:
    Khvostenko, Dmytro
    Abstract:
    Dental resin composites are widely used in modern dentistry due to their aesthetic appearance. However, resin based restorations have inferior mechanical properties (fracture is the second reason for restorations replacement) in comparison to alloy based composites and their antimicrobial properties still remain poor, leading to secondary tooth decay development on...
    Resource Type:
    Dissertation
    Full Text:
    material performance and it should be at least 50 MPa [68]. For dental materials, flexural strength is

  • An experimental approach to analyze large notched composite panels loaded in out-of-plane shear

    Creator:
    Froemming, Tyler M.
    Abstract:
    Identifying material characteristics of composites is important in designing any structural system. The aerospace industry relies on these material properties not only to design a functional aircraft, but also a safe and reliable one. Since carbon fiber composites are relatively new materials, little is known about its characteristics under certain...
    Resource Type:
    Masters Thesis
    Full Text:
    : _______________________________________________________________________ Brian K. Bay Identifying material characteristics of composites is important in

  • 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:
    method results. A brittle polymer Polymethyl methacrylate (PMMA) was used as substrate material, and

  • Quantification of total and plastic 3D strain fields within micro-damaged polyurethane foam

    Creator:
    Sutton, Matthew T.
    Abstract:
    Local material damage that occurs within cellular solids, such as polymer foams and trabecular bone, and precedes local fractures of the cell struts or walls is called micro-damage. The accumulation of micro-damage within cellular solids is often undesirable, although it is thought to be vital to the development and health...
    Resource Type:
    Masters Thesis
    Full Text:
    Foam Abstract approved: ,- I f BrianK. Bay Local material damage that occurs within cellular

  • Characterization of high temperature fatigue mechanisms in Haynes 282 nickel based superalloy

    Creator:
    Rozman, Kyle A.
    Abstract:
    Electric power needs will only grow over the next decades as more humans ascend from poverty into the middle class. Currently, the majority of electric power is generated by burning fossil fuels. To help mitigate the undesirable effects of burning fossil fuels research is being done to increase the efficiency...
    Resource Type:
    Dissertation
    Full Text:
    ................................................................... 11 1.2.3 Cyclic deformation in FCC material