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Filtering by: Creator Martin, Mark A. Remove constraint Creator: Martin, Mark A. Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • A Computational Framework for Resilience-Informed Design

    Creator:
    Hulse, Daniel E.
    Abstract:
    It is desirable for complex engineered systems to perform missions efficiently and economically, even when these missions' complex, variable, long-term operational profiles make it likely for hazards to arise. It is thus important to design these systems to be resilient so that they will actively prevent and recover from hazards...
    Resource Type:
    Dissertation
    Full Text:
    degree of Doctor of Philosophy in Mechanical Engineering presented on December 7, 2020. Title: A

  • A framework for assessing and improving the resilience of complex engineered systems during the early design process

    Creator:
    Mehrpouyan, Hoda
    Abstract:
    As modern systems continue to increase in size and complexity, they pose significant safety and risk management challenges. System engineers and much of the government research efforts are focused on understanding the attributes and characteristics that emerge from the interactions of components and subsystems. As a result, the objective of...
    Resource Type:
    Dissertation
    Full Text:
    A Framework for Assessing and Improving the Resilience of

  • A framework to model reliability and failures in complex systems during the early engineering design process

    Creator:
    O'Halloran, Bryan M.
    Abstract:
    An open area of research in complex systems is to move reliability and failure assessments earlier in the engineering design process. When compared to later design, early decisions are cost effective and have a large impact on the system. Standard methods are limited by the availability of data and often...
    Resource Type:
    Dissertation
    Full Text:
    Mechanical Engineering presented on May 3, 2013. Title: A FRAMEWORK TO MODEL RELIABILITY AND FAILURES IN

  • 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:
    A nonlocal damage theory for laminated plate with application

  • A numerical study of inertial flow features in moderate Reynolds number flow through packed beds of spheres

    Creator:
    Finn, Justin Richard
    Abstract:
    In this work, flow through synthetic arrangements of contacting spheres is studied as a model problem for porous media and packed bed type flows. Direct numerical simulations are performed for moderate pore Reynolds numbers in the range, 10 ≤ Re ≤ 600, where non-linear porescale flow features are known to...
    Resource Type:
    Dissertation
    Full Text:
    : A Numerical Study of Inertial Flow Features in Moderate Reynolds Number Flow Through Packed Beds of

  • 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:
    . Title: A Relationship Between Wave Dispersion and Fracture Strength for a Composite Material Abstract

  • A risk-informed decision making framework accounting for early-phase conceptual design of complex systems

    Creator:
    Van Bossuyt, Douglas L.
    Abstract:
    A gap exists in the methods used in industry and available in academia that prevents customers and engineers from having a voice when considering engineering risk appetite in the dynamic shaping of early-phase conceptual design trade study outcomes. Current methods used in Collaborative Design Centers either collect risk information after...
    Resource Type:
    Dissertation
    Full Text:
    : A Risk-Informed Decision Making Framework Accounting for Early-Phase Conceptual Design of Complex

  • 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:
    degree of Doctor of Philosophy in Mechanical Engineering presented on February 27, 2003. Tile: A Study of

  • A study of ignition and propagation of combustive synthesis reaction between titanium and carbon

    Creator:
    Hernandez-Guerrero, Abel
    Abstract:
    Combustive Synthesis or Self-Propagating High-Temperature Synthesis (SHS), is an energy-efficient combustion method of producing metallic, ceramic and composite materials from their constituent powders. This thesis presents the results of an experimental and numerical evaluation of the propagation velocity for the SHS solid-solid reaction of titanium and carbon, as well as...
    Resource Type:
    Dissertation
    Full Text:
    A study of ignition and propagation of combustive

  • A study of laser generated Rayleigh and Lamb waves in graphite/epoxy composites

    Creator:
    Park, Heeyong
    Abstract:
    The application of laser generated ultrasonics was first demonstrated in the mid-seventies and has shown good potential when applied to isotropic materials. However, its use with composite materials is still in the early stages of development. This study explores the potential for application of laser generated Rayleigh and Lamb waves...
    Resource Type:
    Dissertation
    Full Text:
    A study of laser generated Rayleigh and Lamb waves in