1,909 research outputs found
Residual Stresses in a Cu-CFC Component for Thermonuclear Application: Numerical Prediction and Experimental Evaluation Using an Indentation Technique
No full textThe present work concerns the assessment of residual stresses (RS) in a component for thermonuclear applications, made by casting of copper on a carbon fibre-reinforced carbon composite and intended to be subjected to severe cycles of thermal, mechanical and neutron loads. The magnitude of RS left at the interface between the two materials in the production process, due
to thermal expansion mismatch, has to be carefully assessed. In the present investigation, the likely spatial distribution of the RS has been predicted first using numerical analysis and has been validated experimentally, then, on the basis of the results of indentation tests performed at the micron scale on the metal layer. It is shown that this simple and fast methodology can return reliable results in the present context
Constitutive modelling and mechanical characterization of aluminium-based metal matrix composites produced by spark plasma sintering
Get PDFSpark plasma sintering has been applied to the production of aluminium-based functionally graded material systems to be used in abrasive and high temperature conditions. The overall mechanical properties of these metal matrix composites were determined during the optimization phases of the production process by a fast and reliable identification procedure based on instrumented indentation, which can be easily performed on small specimens. The experimental information gathered from conical (Rockwell) indentation was used as input data for the calibration of the material parameters entering the elastic–plastic Drucker–Prager constitutive model. Eventually, the so identified material parameters were used to predict the result of pyramidal (Vickers) indentation, in order to validate the model selection and the output of the identification procedure. The good matching between modelling and experimental results for the different test configurations confirmed the soundness of the considered approach, especially evidenced on the light of the strong influence on the overall mechanical characteristics of the material microstructure and defectiveness resulting from the production process, which prevent the use of classical homogenization rules to evaluate the macroscopic material properties
Conceptual Design Automation: Abstraction complexity reduction by feasilisation and knowledge engineering
No full textIn order to keep innovating, engineers are working more and more with engineering software, providing them a way to cut away their routine and repetitive activities. Computer aided design and simulation software are for instance considered standard tools in most engineering companies. Today, to solve complex engineering design problems, multidisciplinary design optimisation (MDO) is increasingly used to automate the design process to support the engineer in finding a solution faster. To effectively use MDO, design frameworks such as the design and engineering engine (DEE) are required. More and more does engineering software provide a seamless integration of computer software and human knowledge, a focus point of the field of knowledge engineering (KE). This will free engineers from repetitive and routine tasks and allow them to use their full creative capacity and learn faster, increasing their productivity. This work contributes to the development of KE applications within the DEE to support the MDO process. The focus is on the conceptual design phase of complex systems engineering, responsible for providing an initial start vector for MDO. Aircraft design is taken as a guiding example as it is a typical case of a complex system.Design of Aircraft and RotorcraftAerospace Engineerin
The literary phenomenon of 'conflation’ in the reworking of Paul’s letter to the Colossians by the author of the letter to the Ephesians
Get PDFThis thesis is concerned with the nature of the relationship of the Letter to the Ephesians (Eph) to Paul's Letter to the Colossians (Col).The first three chapters seek to argue that this relationship should be designated as "literary dependent". In Chapter I the suggestion made by A.T. Lincoln (Dallas [Texas], 1990) that the contemporary redaction of the Letter of Aristeas by Josephus in his Jewish Antiquities, Book XII, §§ 11-118 is similar to the use the author of Eph made of Col, is exposed to critical review. Chapter II focuses on the phenomenon of repeated 'conflation' in Eph. This literary phenomenon entails that several 'Colossian' texts from different parts of Col are conflated by the author of Eph into one passage and is subjected to exhaustive analysis. It is argued that conflation is the main feature of the literary dependence of Eph on Col but does not occur in Josephus' reworking of the Letter of Aristeas. Chapter III continues the comparison between the method of reworking employed in the Jewish Antiquities and in Eph by pointing out that the fluctuation in verbatim agreement of one document with its source can be meaningful. Chapter IV provides the new synopsis of both letters on which the whole examination is based. This synoptic overview is a desideratum since the previous synoptic editions of the Greek text of both letters by E.J. Goodspeed (Chicago, 1933) and C.L. Mitton (Oxford, 1951) are not accurate enough and unsuitable for research that focuses on the conflations of 'Colossian' verses in Eph. The fifth and last chapter deals with the question why Eph is literary dependent on Col and shows that despite the literary dependence, the theology of Eph is distinctive in comparison with its source Col. The distinctiveness of Eph's theology consists in a critical modification of the stress which Col places on Christ's already accomplished victory over the cosmic powers (Co/ 2.15). In order to safeguard an authoritative reception of his modification of Col, the author of Eph presented his letter as the parallel letter of Col alluded to m Col 4.16. The literary dependence on Col is necessary both to modify its content and to present his own writing as its parallel letter
Catherine The Faithful Queen Dowager
No full text<p>4. Catherine The Faithful Queen Dowager</p>
<p>Author / Authors : Charles E.J. Moulton<br>Page no. 56 – 68<br>Discipline : History/Swedish History<br>Script/language : Roman/English</p>
<p>Category : Research paper</p>
<p>Keywords: Swedish history, Renaissance women, Arranged marriages, 16th century royalty.</p>
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Mechanical characterization of metal-ceramic composites
No full textMetal-ceramic composites represent a class of quasi-brittle materials for advanced structural applications that require adequate mechanical characterization. Difficulties and costs associated with material production and specimen extraction prevent the execution of a statistically meaningful number of standard laboratory tests. Parameter calibration methodologies based on instrumented indentation and inverse analysis represent fast and reliable identification procedures in the present context, as shown by the present contribution, based on some experience achieved in the framework of the European Network of Excellence on ‘Knowledge-based Multi-component Materials for durable and safe performance’ (KMM-NoE)
Introduction
No full textCONTENTS:
List of Tables;
List of Plates;
Acknowledgements;
Notes on the Contributors;
Introduction: P.Garside, E.J.Clery & C.Franklin;
PART I: AUTHORSHIP Anne Grant and the Professionalization of Privacy; P.Perkins Women Poets and Anonymity in the Romantic Era; P.R.Feldman Walter Scott: Anonymity and the Unmasking of the Harlequin; C.Lamont James Hogg and his Publishers: The Queen's Wake and Queen Hynde; D.S.Mack Author and Community: John Clare and John Taylor; P.Chirico PART II: COMMERCE Eliza Haywood and the Discourse of Taste; R.W.Jones Camilla in the Market Place: Moral Marketing and Feminist Editing in 1796 and 1802; S.Salih Economics, Expertise, Enterprise and the Literary Scene: The Commercial Management Ethos in British Circulating Libraries; C.Skelton-Foord Popular Romanticism?: Publishing, Readership and the Making of Literary History; B.Colbert PART III: THE PUBLIC Cultures of Print: Mass Markets and Theories of the Liberal Public Sphere; J.Stoddart 'The Hastings Circle': Writers and Writing in Calcutta in the Last Quarter of the Eighteenth Century; M.J.Franklin A 'Memorable Grave': The Abject Subtext of Charles Lloyd's Edmund Oliver; P.Keen State Patronage and the Romantic Writer: Henry Taylor's Modest Proposal; W.Christi
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