1,721,041 research outputs found
Fatigue analysis of butt welded AH36 steel joints: Thermographic Method and design S-N curve
No full textThe traditional methods of fatigue assessment of welded joints have some limitations, and are extremely time consuming. In order to overcome these difficulties, the Thermographic Method (TM), based on thermographic analyses, has been applied to predict the fatigue behaviour of butt welded joints, made of AH36 steel, largely used in shipbuilding. Experimental tests have been carried out to assess the fatigue capability in terms of S-N curves and fatigue limits. The predictions of the fatigue capability obtained resorting to the Thermographic Method show a good agreement with those derived from the traditional procedure. Moreover, the fatigue design recommendations were compared to the experimental data in order to analyse the reliability of the codes
Determinazione rapida della resistenza a fatica di giunti saldati in acciaio utilizzati in campo navale
No full textIndagini sperimentali termografiche per la caratterizzazione a fatica di giunti di testa in acciaio e confronto con le normative vigenti
No full textThermoelastic and Elastoplastic Effects Measured by Means of a Standard Thermocamera
No full textIt is well known that a metallic specimen changes its temperature when it is subjected to cyclic stresses. If the
strain is elastic, the temperature change is produced by
two main effects: elastoplasticity and thermoelasticity.
The first phenomenon is due to microplasticity and energy
dissipation inside a material that causes the conversion of
mechanical energy into heat. Thermoelasticity can be explained through the first thermodynamic law, according to
which volume increase is associated to temperature decrease
in adiabatic conditions, and vice versa. Thermoelasticity and
elastoplasticity produce very different temperature patterns.
The first one induces a periodic temperature change, synchronous with loading history and proportional to the actual
load amplitude.
1
The thermoplasticity produces a continuous
temperature increment, related to both load amplitude and
the number off performed cycles until thermal equilibrium is
reached
Fatigue Prediction by Thermographic Method of Aluminum Alloy 6082 Panels: Comparison between FSW and MIG Welding
No full textThis paper is focused on the fatigue behaviour of aluminium alloy welded joints, which can represent points of weakness in the ship structure. The traditional methods of fatigue assessment of welded joints have some limitations, and are extremely time consuming. In order to overcome these difficulties, the Risitano's method, based on thermographic analysis, has been applied to predict the fatigue behaviour of welds. Experimental tests have been carried out to assess and compare the fatigue capability (S-N curves, endurance limits) of different welded joints, obtained by means of Friction Stir Welding (FSW) and Metal Inert Gas welding (MIG). Fatigue predictions obtained resorting to the Thermographic Method (TM) show a good agreement with those derived from the traditional procedure. Thus, TM proves to be a powerful tool also for the characterization of the mentioned kind of welded joints
Thermographic Method for Fatigue Prediction of Friction Stir Welded Light Alloy Panels in Shipbuilding
No full textThis paper is focused on the fatigue behaviour of aluminium alloy welded joints, which can represent regions of weakness in the ship structure. The traditional methods for fatigue assessment of welded joints have some limitations, and are extremely time consuming. In order to overcome these difficulties, the Risitano’s method, based on thermographic analysis, have been applied to predict the fatigue behaviour of welds. Experimental tests have been carried out to assess and compare the high-cycle endurance limits of different welded joints, obtained by means of Friction Stir Welding (FSW) and MIG techniques. The results obtained resorting to the Thermographic Method (TM) show a good agreement with those derived from the experimental data, represented through S-N curves
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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