Search results for "BEM"
showing 10 items of 133 documents
Strain gradient elasticity within the symmetric BEM formulation
2014
The symmetric Galerkin Boundary Element Method is used to address a class of strain gradient elastic materials featured by a free energy function of the (classical) strain and of its (first) gradient. With respect to the classical elasticity, additional response variables intervene, such as the normal derivative of the displacements on the boundary, and the work-coniugate double tractions. The fundamental solutions - featuring a fourth order partial differential equations (PDEs) system - exhibit singularities which in 2D may be of the order 1/ r 4 . New techniques are developed, which allow the elimination of most of the latter singularities. The present paper has to be intended as a resear…
Dominio razzista ed etica del passante. L'antropologia critica di Achille Mbembe
2020
This paper discusses Achille Mbembe’s critique of racial segregation taken as the descriptive and theoretical ground for a critical anthropology. Mbembe’s most important works On the Postcolony (2000), Critique de la Raison Nègre (2013), and Politiques de l’intimité (2016) are read as a coherent system aimed at unfolding the philosophical meaning of different forms of racial segregation. Race is outlined as a principle of separation whose broader meaning lies in forcing the multi-layered human experience into rigid categories, thereby achieving the objectifying of humans. Mbembe’s books also show the sharpening of a peculiar methodological approach aimed at reconciling a universal philosoph…
Selection of radiological methods in the diagnosis of pulmonary artery thromboembolism
2021
Bakalaura darbā ir veikta zinātniskās literatūras analīze par tēmu “Radioloģisko metožu izvēle plaušu artērijas trombembolijas diagnostikā”. Darba teorētiskajā daļā tika aprakstīts par krūšu kurvja anatomiju, krūšu kurvja asinsvadu anatomiju, par PATE patfizioloģiju, riska faktoriem, PATE klīniskajām izpausmēm un COVID-19 izraisītu PATE. Darba mērķis: zinātniskās literatūras analīze par radioloģisko metožu izvēli PATE diagnosticēšanā, metožu salīdzināšana. Pamatojoties uz literatūras datiem, COVID - 19 situāciju pasaulē, bakalaura darba tēma “Radioloģisko metožu izvēle plaušu artēriju trombembolijas diagnostikā” ir aktuāla. Pētījuma metadoloģija: literatūras avotu apkopošana, analīze un kva…
O modelo da economia do bem comum: abordagem a partir da abordagem organizacional e análise bibliométrica
2019
Resumen El trabajo tuvo por objeto realizar una aproximación al modelo de la economía del bien común desde la organización de empresas, así como desde un análisis bibliométrico. Se realizó una comparación entre el enfoque empresarial de la economía del bien común y dife- rentes teorías organizativas: recursos y capacidades, stakeholders y creación de valor compartido. Mediante el análisis bibliométrico, se identificaron los trabajos publicados sobre la economía del bien común desde su surgimiento en 2010 hasta 2018, mediante búsqueda realizada en Web of Science y Dialnet. Se demuestra que su enfoque empresarial está relacionado con diferentes teorías de la organiza- ción de empresas y que a…
Homo ludens - homo viator : le jongleur au coeur des échanges culturels au Moyen Age
2002
International audience
Active macro-zones algorithm via multidomain SBEM for strain-hardening elastoplastic analysis
2010
In this paper a strategy to perform strain-hardening elastoplastic analysis by using the Symmetric Boundary Element Method (SBEM) for multi-domain type problems is shown. The procedure has been developed inside Karnak.sGbem code by introducing an additional module.
Analisi limite ed a shakedown mediante il metodo simmetrico degli elementi di contorno
2012
A reformulation of the static approach to evaluate directly the shakedown and limit multipliers by using the Symmetric Boundary Element Method for multidomain type problems [1,2] is shown. The present formulation utilizes the self-equilibrium stress equation [3-5] connecting the stresses at the Gauss points of each substructure (bem-e) to plastic strains through a stiffness matrix (self stress matrix) involving all the bem-elements in the discretized system. The numerical method proposed is a direct approach because it permits to evaluate the multiplier directly as lower bound through the static approach. The analysis has been performed as a costrained optimization problem, solved through m…
Elastoplastic analysis for active macro-zones via multidomain symmetric Galerkin BEM
2010
In this paper a strategy to perform elastoplastic analysis by using the Symmetric Boundary Element Method (SBEM) for multidomain type problems is shown. This formulation uses a self-stresses equation to evaluate the trial stress in the predictor phase, and to provide the elastoplastic solution in the corrector one. Since the solution is obtained through a return mapping involving simultaneously all the plastically active bem-elements, the proposed strategy does not depend on the path of the plastic strain process and it is characterized by computational advantages due the considerable decrease of the plastic iterations number. This procedure has been developed inside Karnak.sGbem code [1] b…
SBEM multidomain analysis of plate bending and stretching problems
2010
Symmetric Galerkin Boundary Element Metod for 3D analysis
1999
The mixed boundary value problem is dealt with by Galerkin approach in 3D linear elasticity via a system of boundary integral equations. This paper presents a method for computing a solving system coefficient made up of double surface integrals with hypersingular kernel. This method employs the Schwartz distribution theory in order to obtain the closed form of the first surface integration which represents the traction. The successive surface integration of the weighed traction having a kernel with logarithmic singularity uses known numerical techniques. This formulation requires C° continuity of shape functions modelling the source represented by the displacement discontinuity.