1,721,045 research outputs found
sj-docx-1-pib-10.1177_09544054211037493 – Supplemental material for Dynamic modelling of a servo self-pierce riveting (SPR) process
No full textSupplemental material, sj-docx-1-pib-10.1177_09544054211037493 for Dynamic modelling of a servo self-pierce riveting (SPR) process by Daniel Tang, Mike Evans, Paul Briskham, Luca Susmel and Neil Sims in Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture</p
Environment effect on the mechanical behaviour of a thermally treated superduplex UNS S32760.
No full textThe susceptibility to stress corrosion cracking (SCC) of a thermally treated (4, 10, 30 min at 950°C) superduplex UNS S32760, in a simulated petrochemical process environment, containing hydrogen sulphide and chloride (20%wt. NaCl + 0.1M Na2S2O3, 80°C), was evaluated using the slow strain rate tensile (SSRT) technique. At the end of the test, the samples gauge length section and the fracture surface were observed by optical microscope (OM) and scanning electron microscope (SEM). SCC susceptibility was also estimated by means of the ratio (R) between the percentage of elongation at fracture obtained by the SSRT test in two aggressive solutions and the percentage of elongation at fracture obtained in air. The results showed that the UNS S32760 treated for 10 min at 950°C was the most susceptible to SCC in the 20% NaCl solution containing 0.1M Na2S2O3
Coupled FEM-DBEM Simulation of 3D Crack Growth under Fatigue Load Spectrum
Full text linkAbstractNumerical predictions of fatigue crack growth under load spectrum are obtained by coupled FEM-DBEM approach. An initial part-through corner crack, in a pre-notched specimen undergoing a traction fatigue load, propagates becoming through the thickness. A two parameter crack growth law (“Unified Approach”) is calibrated by in house made constant amplitude experimental tests and the crack growth retardation after an overload application is reproduced. The residual stresses responsible for such retardation are calculated by a sequence of elastic-plastic static FEM analysis; such stresses are then applied to the crack faces for the propagation simulation in a DBEM environment. A satisfactory agreement between numerical and experimental crack growth rates are displayed, for both part-through crack and through the thickness crack. This approach provide general modeling capabilities, with allowance for general crack front shape and fully automatic propagation
Multiaxial Fatigue Crack Propagation of an Edge Crack in a Cylindrical Specimen Undergoing Combined Tension-Torsion Loading
Full text linkAbstractA three-dimensional crack propagation simulation of a hollow cylinder undergoing coupled traction and torsion loading conditions is performed by the Dual Boundary Element Method (DBEM). The maximum tension load and torque are equal to 40 kN and 250 Nm respectively. Specimens, made of Al alloys B95AT and D16T, have been experimentally tested with in-phase constant amplitude loads. The Stress Intensity Factors (SIFs) along the front of an initial part through crack, initiated from the external surface of the hollow cylinder, are calculated by the J-integral approach. The crack path is evaluated by using the Minimum Strain Energy Density (MSED) criterion whereas the Paris’ law, calibrated for the material under analysis, is used to calculate crack growth rates. A cross comparison between DBEM and experimental results is presented, showing a good agreement in terms of crack growth rates and paths
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
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