388 research outputs found

    Collected Papers in Structural Mechanics Honoring Dr. James H. Starnes, Jr.

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    This special publication contains a collection of structural mechanics papers honoring Dr. James H. Starnes, Jr. presented at the 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference held in Austin, Texas, April 18-21, 2005. Contributors to this publication represent a small number of those influenced by Dr. Starnes' technical leadership, his technical prowess and diversity, and his technical breath and depth in engineering mechanics. These papers cover some of the research areas Dr. Starnes investigated, which included buckling, postbuckling, and collapse of structures; composite structural mechanics, residual strength and damage tolerance of metallic and composite structures; and aircraft structural design, certification and verification. He actively pursued technical understanding and clarity, championed technical excellence, and modeled humility and perseverance

    Eighth DOD/NASA/FAA Conference on Fibrous Composites in Structural Design, Part 2

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    Papers presented at the conference are compiled. The conference provided a forum for the scientific community to exchange composite structures design information and an opportunity to observe recent progress in composite structures design and technology. Part 2 contains papers related to the following subject areas: the application in design; methodology in design; and reliability in design

    Ultimate strength

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    Concern for the ductile behaviour of ships and offshore structures and their structural components under ultimate conditions. Attention shall be given to the influence of fabrication imperfections and in-service damage and degradation on reserve strength

    Analytical and experimental investigation of aircraft metal structures reinforced with filamentary composites. Phase 3: Major component development

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    Analytical and experimental investigations, performed to establish the feasibility of reinforcing metal aircraft structures with advanced filamentary composites, are reported. Aluminum-boron-epoxy and titanium-boron-epoxy were used in the design and manufacture of three major structural components. The components were representative of subsonic aircraft fuselage and window belt panels and supersonic aircraft compression panels. Both unidirectional and multidirectional reinforcement concepts were employed. Blade penetration, axial compression, and inplane shear tests were conducted. Composite reinforced structural components designed to realistic airframe structural criteria demonstrated the potential for significant weight savings while maintaining strength, stability, and damage containment properties of all metal components designed to meet the same criteria

    Computational Methods for Failure Analysis and Life Prediction

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    This conference publication contains the presentations and discussions from the joint UVA/NASA Workshop on Computational Methods for Failure Analysis and Life Prediction held at NASA Langley Research Center 14-15 Oct. 1992. The presentations focused on damage failure and life predictions of polymer-matrix composite structures. They covered some of the research activities at NASA Langley, NASA Lewis, Southwest Research Institute, industry, and universities. Both airframes and propulsion systems were considered

    Reinventing the Wheel

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    Reinventing the Wheel selected tires and designed wheels for the 2018 Cal Poly, San Luis Obispo Formula SAE combustion vehicle. Available tire options were evaluated for steady-state and transient performance as well as vehicle integration. A single-piece composite wheel with hollow spokes was designed to meet stiffness, strength, and tolerance requirements. A detailed study of wheel loading and geometric structural efficiency was performed. Finite element analysis was used to iterate the geometry and laminate. A two-piece male mold was designed and machined to manufacture the wheel. Removable silicone inserts were used to create the hollow spokes

    Aspects of Rational Structural Design of SWATH Ships

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    The aim of the work described herein is to provide the background, underlying assumptions and considerations, as well as describe the tools necessary for the development of reliability-based strength criteria for the design of the structural components of fast, multi-hulled ships (Chapters 1-4) in general, and SWATH ships in particular. An overall view of the current state and future prospects of the fast marine transportation market, highlighting the limitations and advantages of the application of such advanced marine concepts is provided in Chapter 1. The challenges, both strategic and technological, that would have to be overcome before these concepts enjoy a more widespread acceptance from the passengers, operators, and governments, are identified and form the background within which the work described herein develops. It has been inevitable that a large number of topics had to be covered in order to provide the reader with the overall picture of the structural design problems expected and their solutions in this novel form of transportation. As a result, no claim for completeness is made herein, but instead an 'in width' study of the topic was felt as most appropriate for establishing the degree of interrelation and interaction of the various aspects of structural design, and has therefore been actively pursued. The problem of estimation of both primary and secondary loads on SWATH ships is tackled in Chapter 2, by reviewing the options and methods available to the designer. Of the secondary loads, the question of slamming load prediction on the underdeck of SWATH ships has been given some attention, via two sets of drop tests (one by the author) carried out at the Department of Naval Architecture and Ocean Engineering, University of Glasgow and the main results described herein. Current approaches for the determination of fatigue damage loading are also described. Chapter 3 concentrates on the strength modelling aspects and the associated uncertainty as applicable to the fatigue design of both monohull and multi-hull vessels. A brief description of the sources of fatigue strength reduction in welded structures and the possible repair measures, the background to the major steel and aluminium fatigue design codes is presented, coupled with a comparison of the major aluminium fatigue design codes. The probabilistic derivation of partial safety factors for fatigue strength expressions is also presented but not demonstrated. In Chapter 4, the work has concentrated mainly in the area of strength modelling for the various structural components of the SWATH ship under all possible load combinations they might be expected to withstand. Although it stops just short of deriving appropriate partial safety factors for the various structural components and failure modes in a multi-hull structure, detailed guidance on how to do so is provided. The reliability-based design procedure to the structural optimisation, with respect to cost, weight and safety, of an example SWATH ship, the M.V. Patria is applied and described instead in Chapter 5. The conclusions of the research, recommendations on the most appropriate strength formulations and the areas which may benefit from further research are all finally identified in Chapter 6. Note: Description of the various parameters used in individual Chapters is adequately covered in the Notation Section, unless otherwise presented in the text
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