1,720,980 research outputs found
Morgan (M.R.). The Chronicle of Ernoul and the Continuations of William of Tyre.
No full textRothwell W. Morgan (M.R.). The Chronicle of Ernoul and the Continuations of William of Tyre.. In: Revue belge de philologie et d'histoire, tome 54, fasc. 2, 1976. Histoire (depuis l'Antiquité) — Geschiedenis (sedert de Oudheid) pp. 650-651
Parametric equations for distributions of stress concentration factors in tubular K-joints under out-of-plane moment loading
No full textAn extensive parametric study, using finite elements, of the stress concentration factors in tubular K-joints commonly found in offshore platforms is presented. This study covers a comprehensive range of geometric joint parameters for unbalanced out-of-plane moment loading. The results of the study were first used to assess the widely used parametric equations of Efthymiou (Proceedings of the Conference on Recent Developments in Tubular Joints Technology, Surrey, 1988, p. 2–1) and Lloyds Register (Proceedings of the 1st International Society of Offshore Polar Engineers Conference, 1991, Edinburgh), which provide predictions of stress concentration factors at the saddle on the outer surfaces of the chord and the brace as a function of the joint geometric ratios. The database of thin shell finite element results generated was then used to develop parametric equations for predicting stress concentration factors at key locations around the joint intersection on the outer, as well as the inner, surfaces of the chord. The reliability of the proposed and existing parametric equations was then assessed using the acrylic joint database published by the UK Department of Energy (Draft Background to New Fatigue Design Guidance for Steel Joints and Connections in Offshore Structures, 1995). The paper concludes with fracture mechanics fatigue calculations to demonstrate that the information provided from the proposed equations could be utilised to obtain accurate, and safe, fatigue life estimates
Morgan (M.R.). The Chronicle of Ernoul and the Continuations of William of Tyre.
No full textRothwell W. Morgan (M.R.). The Chronicle of Ernoul and the Continuations of William of Tyre.. In: Revue belge de philologie et d'histoire, tome 54, fasc. 2, 1976. Histoire (depuis l'Antiquité) — Geschiedenis (sedert de Oudheid) pp. 650-651
Stress concentration factors in tubular K-joints under in-plane moment loading
No full textAn extensive parametric study is presented of the distributions of stress concentration factors in tubular K-joints commonly found in offshore platforms. The study covers a comprehensive range of geometric joint parameters for balanced in-plane moment loading. The results of the study were first used to assess two sets of widely used parametric equations, which predict the maximum stress concentration factors on the outer surfaces of the chord and the brace. The new database of finite-element results was then used to develop parametric equations for predicting stress concentration factors at key locations around the intersection on the outer as well as the inner surfaces of the chord. The reliability of the proposed and existing parametric equations was then assessed using an acrylic test joint database and some published test data measured from a steel model. Fracture mechanics fatigue calculations were also performed to demonstrate that the information provided from the proposed equations could be utilized to obtain accurate, and safe, fatigue life estimates
New parametric equations for stress concentrations in tubular K-joints under balanced axial loading
No full textAn extensive parametric study is presented on stress concentrations in tubular K-joints calculated using thin shell finite elements. This study covers a comprehensive range of geometric joint parameters under balanced axial loading. The results of this investigation were used to assess the existing parametric equations of Efthymiou (Proc. Conf. Recent Dev. Tubular Joints Technol., Surrey, 1988, p. 2-1) and Lloyds Register (Proc. 1st Int. Soc. Offshore Polar Eng. Conf., 1991, Edinburgh). These equations predict stress concentration factors on the chord and the brace at selected locations as a function of the joint geometry, and are based upon databases which cover relatively narrow ranges of geometric parameters. The new database of thin shell finite element results was used to develop new parametric equations for estimating stress concentration factors on the chord and on the brace. The reliability of the proposed parametric equations was then assessed using the database of steel and acrylic joints published recently by the Department of Energy (Draft Background to New Fatigue Design Guidance for Steel Joints and Connections in Offshore Structures, 1995).<br/
Prediction of stress concentrations and degrees of bending in axially loaded tubular K-joints
No full textAn extensive database of stress concentrations and degree of bending in tubular K-joints under balanced axial loading, generated recently in a finite element parametric study, has been used to develop parametric equations. The study covers a comprehensive range of geometric joint parameters which are commonly found in offshore structures. This database of thin shell finite element results was used to develop parametric equations for estimating stress concentration factors and the degree of bending at key locations on both the chord and brace. Formulae for the stress distributions around the intersection of K-joints were also derived using the parametric equations at key locations as input parameters, thus allowing the stress distributions to be predicted from the geometric joint parameters. Fracture mechanics fatigue calculations were performed to demonstrate that the information provided from the proposed equations could be used to obtain safe estimates of fatigue lives of tubular K-joints
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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