1,721,048 research outputs found
Calculation of local stress-strain behavior at notches for non-masing material under cyclic loading
No full textIn this study, the incremental Neuber's rule and the incremental Glinka's equivalent strain energy density (ESED) method were formulated. With the proposed formulations, the transient behaviours as well as the stabilized ones at the notch tip could be described. The constitutive model of 316L stainless steel was constructed to characterize the non-Masing behaviour of the bulk material combined with the local approximations. The notch tip stresses and strains using the approximations were verified to compare with the finite element method (FEM) results.Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Kore
Application of local stress-strain approaches in the prediction of fatigue crack initiation life for cyclically non-stabilized and non-Masing steel
No full textThis study presents a methodology of life prediction of fatigue crack initiation for the cyclically non-stabilized and non-Masing steel. The cyclic behavior of 316L stainless steel was modelled, and the constitutive model was combined with local stress-strain approximations at a notch. The local stress-strain approximation methods were formulated incrementally to get the notch tip stress-strain of the non-Masing material. The local approximations were compared with the FEM results for verification. The prediction of fatigue crack initiation life was carried out by adopting plastic strain energy density (PSED) as a fatigue parameter and all the life prediction results were within factors of two of the experimental results. (c) 2005 Elsevier Ltd. All rights reserved.Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Kore
Source Localization of Mouse EEG Based on Independent Component Analysis (abstract only)
No full textExperimental investigation on the proper fatigue parameter of cyclically non-stabilized materials
No full textLow-cycle fatigue tests were carried out in air in a wide temperature range from room temperature to 650 degrees C to investigate the role of temperature on the low-cycle fatigue behavior of two types of stainless steels, cold-worked (CW) 316L austenitic stainless steel and 429 EM ferritic stainless steel. CW 316L stainless steel underwent additional hardening at room temperature and in 250-600 degrees C: plasticity-induced martensite transformation at room temperature and dynamic strain aging in 250-600 degrees C. As for 429 EM stainless steel, it underwent remarkable hardening in 200-400 degrees C due to dynamic strain aging, resulting in a continuous increase in cyclic peak stress until failure. Three fatigue parameters, such as stress amplitude, plastic strain amplitude and plastic strain energy density, were evaluated. The results revealed that plastic strain energy density is nearly invariant through a whole life and, thus, recommended as a proper fatigue parameter for cyclically non-stabilized materials.Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejon, South Kore
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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