90,536 research outputs found

    Stresses in the vicinity of an un-reinforced mitre intersection: an experimental and finite element comparison

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    The experimental investigation reported provides elastic stresses in the vicinity of the unreinforced intersection of a single 90° mitred bend, subjected to an in-plane bending moment. The specimen was extensively strain gauged on the outer surface. A small number of rosettes were also laid on the inside surface close to the welded intersection. The procedures used for the successful installation of the inside surface gauges are discussed. In the experiment, consideration was also given to deflections and rotations. Satisfactory comparisons with adaptive-p thin-shell finite element results were obtained in general and differences are explained in terms of the known experimental variables and finite element approximations. The nature of the stresses at such intersections is discussed and various methods of obtaining fatigue 'hot-spot' stresses are considered

    Barriers to the effective use of finite element analysis in industry

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    This workshop represents the first step in a comprehensive and wideranging pan-European information gathering exercise on a topic that is at the heart of the FENET project. The following three categories of industrial organisation have been identified and all have a valuable input to the workshop. The FENET world-wide survey, which sought to establish the significance of barriers to the effective use of finite element analysis across a range of industry sectors, including Aerospace, Land Transport, Biomedical, Civil Construction, Consumer Goods, Marine and Offshore, Power and Pressure Systems and Process & Manufacture, ran from November 2002 - July 2003. The survey, consisting of over 450 questions, included a wide range of issues covering education and awareness, the staffing of FE projects, the cost of FE products; support-related matters in the widest sense, and an extensive list of functionality-related matters, including integration of the analysis function. Particular emphasis was placed on the topics of multi-physics & analysis technology, life extension & durability and product & system optimization, as these are identified themes within the FENet project

    A review of literature for the structural assessment of mitred bends

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    This paper presents a state-of-the-art review of literature available for the structural assessment of all types of mitred pipe bends. Compared with smooth bends, the volume of literature available for mitres is less extensive and its scope is not as wide. Historically, this reflects a reduced application level, as well as a less demanding range of applications, such as non-high temperature use. There is also the issue that an analysis of a mitred bend is complicated by discontinuity stresses, as well as those due to cross-section ovalisation. This fact delayed the development of non-linear analysis of mitred bends. Nevertheless, there is now a substantial body of work on mitred bends. This review tabulates and characterises all publications to date in chronological order. The details of experimental specimens are highlighted, with a view to these perhaps providing useful verification data for any future finite element analysis for example. Issues of particular interest to pipework designers are discussed, including the effects of combinations of loading, out-of-circularity, tangent pipe length and flanges. Failure characteristics and loads are discussed where relevant. Topics for further research are also noted. For example, comprehensive design curves do not exist for the elastic and plastic behaviour of all mitre types, over a practical range of geometry and loading parameters. Similarly, there is still scope for further work on the effect of combined loading, end effects and out-of-circularity. Limit, collapse and burst loads are not yet available across the entire spectrum of bends and loading parameters either. Creep and optimisation represent virgin territory as far as mitred bends are concerned and given that unforeseen vibration is a common source of high-cycle fatigue failure in pipework, there must also be scope for vibration-induced fatigue studies

    Informatics Research Institute (IRIS) June 2001 newsletter

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    Welcome to the first edition of the Information Systems Institute's Research Newsletter. This Newsletter will be published four times a year (March, June, September and December), and will be published on the ISI research web page. The aim of the Newsletter is to facilitate the exchange of information related to research activities in ISI. Submissions are welcome from staff and research students

    Informatics Research Institute (IRIS) March 2003 newsletter

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