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Filtering by: Creator Kennedy, Roger G. Remove constraint Creator: Kennedy, Roger G. Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering

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  • Three-dimensional, nonlinear viscoelastic analysis of laminated composites : a finite element approach

    Creator:
    Wang, Min
    Abstract:
    Polymeric composites exhibit time-dependent behavior, which raises a concern about their long term durability and leads to a viscoelastic study of these materials. Linear viscoelastic analysis has been found to be inadequate because many polymers exhibit nonlinear viscoelastic behavior. Classical laminate theory is commonly used in the study of laminated...
    Resource Type:
    Dissertation
    Full Text:
    : Timothy C. Kennedy Polymeric composites exhibit time-dependent behavior, which raises a concern about

  • 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:
    support of the work from which this thesis evolved. Finally, I would like to thank Dr. Tim Kennedy, Dr

  • Micromechanics of heterogeneous materials under compressive loading

    Creator:
    Laird, George
    Abstract:
    In mining and mineral processing, compressive loading is often encountered during the comminution of ore bearing minerals and in the wear resistant materials used in the comminution circuit. A common thread joining many of the materials that are primarily used under compressive loading is the presence of a high modulus...
    Resource Type:
    Dissertation
    Full Text:
    Many thanks go to my major advisor, Dr. Timothy C. Kennedy for his thoughtful advice and encouragement

  • Simulating changing diameter distributions in a softwood sawmill

    Creator:
    Salichon, Maxence C.
    Abstract:
    Sawmills are very complex systems that involve many manufacturing processes. The variability of their raw material adds further to this complexity as each log has characteristics that determine its processing path. Therefore, computer simulation is a very useful technique for analyzing sawmill performance. This thesis describes a simulation computer model...
    Resource Type:
    Masters Thesis
    Full Text:
    Kennedy Sawmills are very complex systems that involve many manufacturing processes. The variability of

  • A nonlocal damage theory for laminated plate with application to aircraft damage tolerance

    Creator:
    Nahan, Matthew F.
    Abstract:
    Design of commercial aircraft structure, composed of composite material, requires the prediction of failure loads given large scale damage. In particular, a fuselage of graphite/epoxy lamination was analyzed for damage tolerance given a standard large crack that severed both skin and internal structure. Upon loading, a zone of damage is...
    Resource Type:
    Dissertation
    Full Text:
    : Timothy C. Kennedy Design of commercial aircraft structure, composed of composite material, requires the

  • Failure analysis of pre-notched composite laminated plates under four-point bending conditions

    Creator:
    Arias Gonzales, Sergio
    Abstract:
    Ever since composite laminate technology was introduced into the aerospace and automotive industry, there has been a need to fully understand the damage progression experienced by composite laminated plates in the presence of a notch. While numerous research studies have been conducted on this matter when subjected to in-plane loads,...
    Resource Type:
    Dissertation
    Full Text:
    . __________________________________________________________________ Sergio G. Arias, Author ACKNOWLEDGEMENTS To Dr. Timothy C. Kennedy: I thank you

  • A study of cavitation instabilities in solids

    Creator:
    Puttapitukporn, Tumrong
    Abstract:
    Cavitation instabilities in elastic-plastic solids under spherically-symmetric and axisymmetric loadings were investigated using the finite element method. Both quasi-static and dynamic analyses were used to solve these problems. In the quasi-static analyses, we investigated a cavitation instability in elastic/perfectly-plastic, linear hardening elastic-plastic, power hardening elasticplastic, and constrained silver materials. Here,...
    Resource Type:
    Dissertation
    Full Text:
    Cavitation Instabilities in Solids. Abstract anoroved: Timothy C. Kennedy Cavitation instabilities in

  • A study of forces on simulated heat exchange tubes immersed in a cold fluidized bed

    Creator:
    Donovan, Jerry Eugene
    Abstract:
    The object of this research, project was to study how different parameters effect the magnitude and frequency composition of forces exerted on simulated heat exchange tubes immersed in a cold fluidized bed. Two arrays of tubes were assembled with the tubes mounted in an equilateral triangular pitch pattern. The center...
    Resource Type:
    Masters Thesis
    Full Text:
    C. Kennedy) The object of this research, project was to study how different parameters effect the

  • Development of acoustic emissions testing procedures applicable to conventionally reinforced concrete deck girder bridges subjected to diagonal tension cracking

    Creator:
    Lovejoy, Steven C.
    Abstract:
    A need exists to develop a non-destructive testing technique that can identify the formation and propagation of diagonal tension cracks in conventionally steel reinforced concrete deck girder (RCDG) highway bridges in the State of Oregon. Such a technique could be included into a structural health monitoring (SHM) system installed on...
    Resource Type:
    Dissertation
    Full Text:
    : Timothy C. Kennedy A need exists to develop a non-destructive testing technique that can identify

  • Evaluation of factors contributing to the failure of cast iron water mains

    Creator:
    Takahashi, Gilbert Tamaji
    Abstract:
    An evaluation was made of factors contributing to the service failure of a 12 inch diameter cast iron water pipe in Pendleton, Oregon. The quality of the pipe was found to be acceptable when compared to the acceptance limits established by the American National Standards Institute, Inc. However it exhibited...
    Resource Type:
    Masters Thesis
    Full Text:
    FACTORS CONTRIBUTING TO THE FAILURE OF CAST IRON WATER MAINS Approved by: r's I "Professor Roger