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Filtering by: Creator DeFur, P. L. Remove constraint Creator: DeFur, P. L. Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering

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  • 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:
    L. Strom for the degree of Master of Science in Mechanical Engineering presented on June 4, 2012

  • Design and Optimization of a 1 kW Hybrid Powertrain for Unmanned Aerial Vehicles

    Creator:
    Brown, Sean P.
    Abstract:
    A 1 kW series hybrid powertrain was developed at Oregon State University for use in unmanned aerial vehicles (UAVs). This powertrain was designed to give mission flexibility and increased flight time to fixed-wing vertical takeoff and landing UAVs and multirotor UAVs. The powertrain components, an internal combustion engine and a...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Sean P. Brown for

  • Fatigue Testing and Analysis of Polymer and Composite Materials Used in Heavy-Duty Trucks

    Creator:
    Gahan, Kevan
    Abstract:
    As structural durability analysis is increasingly trusted during the design processes of the automotive industry, more complete and sophisticated modeling of material behavior under both static and dynamic loading conditions is paramount. This is especially true regarding the application of heavy-duty trucks, where modern designs contain large parts such as...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ John P. Parmigiani As structural durability analysis is increasingly trusted during the

  • 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:
    Toughness in Composite Materials with an Angled Incident Crack Abstract approved John P

  • Sensitivity of Hashin damage parameters for notched composite panels in tension and out-of-plane bending

    Creator:
    Wright, Thomas J.
    Abstract:
    When using Finite Element Analysis (FEA) to model notched composite panels, the values of certain material properties can have a great effect on the outcome of the simulation. Progressive damage modeling is used to model how a composite structure will fail, and how that failure will affect the response of...
    Resource Type:
    Masters Thesis
    Full Text:
    -plane bending Abstract approved: John P. Parmigani When using Finite Element

  • Experimental Classification of Intralaminar Matrix Compression Damage Propagation in Carbon Fiber Reinforced Polymers

    Creator:
    Daniels, Mitchell Alan
    Abstract:
    Composites often are able to carry more load after damage due to the structure of laminates. In addition, damage can be difficult to detect in composites compared to homogeneous materials. Understanding the behavior of composite material after damage is vital for composite structural design. Currently, experimental methods exist for classifying...
    Resource Type:
    Masters Thesis
    Full Text:
    . [3] S. Pinho, P. Robinson and L. Ianucci, "Fracture toughness of the tensile and compressive fibre

  • Experimental characterization of saw chain cutting performance

    Creator:
    Otto, Andrew W.
    Abstract:
    Chainsaw users value cutting performance and safety. Knowledge of the forces exerted during sawing are necessary to understand and improve the cutting performance of saw chain. Additionally, cutting forces can be used to form metrics for evaluating performance tradeoffs when using a safety (i.e. low-kickback) saw chain versus a standard...
    Resource Type:
    Masters Thesis
    Full Text:
    : __________________________________________________________________ John P. Parmigiani Chainsaw users value cutting performance and safety. Knowledge of

  • Adhesive Properties Subject to Variation in Temperature, Thickness, and Working Time

    Creator:
    Aerne, Nicholas, S. J.
    Abstract:
    Adhesive use is becoming increasingly common in manufacturing processes. The advantage of adhesives are light weight components, non-destructive fastening techniques and distribution of loads over the applied bond region. Modeling the behavior of adhesive bond lines in fastening joints can help in the design process to make an optimized joint,...
    Resource Type:
    Masters Thesis
    Full Text:
    John P. Parmigiani Adhesive use is becoming increasingly common in manufacturing processes

  • Dielectric Properties of Perovskite Ceramics Based on BaTiO3 and Bi(Mg1/2Ti1/2)O3

    Creator:
    Sundahl, Christopher S.
    Abstract:
    The properties of (1-x)BaTiO3-xBi(Mg1/2Ti1/2)O3 (BT-BMT) ceramics were fabricated from reagent-grade ceramic powders by solid-state methods and investigated for solubility, relative permittivity, dielectric loss, polarization, and electromechanical strain. The solubility limit was found to be between x = 0.3 and 0.4. Ba-deficient samples were fabricated, corresponding to stable single-phase compositions; these...
    Resource Type:
    Honors College Thesis
    Full Text:
    . Abstract approved: _______________________________________________ David P. Cann The

  • Designing and creating the Oregon State age and disability simulation suit

    Creator:
    Rahrer, Adam P.
    Abstract:
    Over 54 million people report having disabilities in the United States. In addition, there are 40.3 million people 65 years and older living in America. As the population continues to live longer and problems with obesity continue to increase, the number of people with limited capabilities will escalate as well....
    Resource Type:
    Masters Thesis
    Full Text:
    >=85/!%8085;2!O>! 0//=8=7>C!83545!045!ME2G!1=??=7>!@57@?5!PB!J504;!0>/!7?/54!?=L=>9!=>!"154=<02