On The Hyperbolic Flow Manifested During The Irreversible Deformation Processes In Spatially Extended Crystalline Systems

2007 ◽  
Author(s):  
Juan Daniel Muñoz-Andrade
Keyword(s):  
Irreversible Deformation ◽  
Hyperbolic Flow ◽  
Spatially Extended ◽  
Deformation Processes

Mapping of the Granular Flow during the Irreversible Deformation Processes in Spatially Extended Polycrystalline Systems

2007 ◽  
Vol 561-565 ◽  
pp. 901-904 ◽  
Author(s):  
Juan Daniel Muñoz-Andrade
Keyword(s):  
Plastic Flow ◽  
Granular Flow ◽  
Irreversible Deformation ◽  
Dislocation Dynamics ◽  
Hyperbolic Motion ◽  
Spatially Extended ◽  
Super Plastic ◽  
Deformation Processes ◽  
Recession Velocity ◽  
Hubble Flow

The objective of this work is to obtain the mapping of the granular flow during the irreversible deformation processes in spatially extended polycrystalline systems (SEPCS) in order to describe and analyse the phenomenology and mechanics of the granular flow. In general, it was established for commercial alloys that, the granular flow is linked with the hyperbolic motion due to dislocation dynamics and self accommodation of grains. Also, the recession velocity of grains in the stain field on the surface of SEPCS increased with the distance along the tension axis from the origin of the coordinate system of reference. This behaviour is very similar to the Hubble flow associated with the expansion process of the universe, where the recession velocity of the galaxies increased in a linear relationship with their distance. In this physical framework the main results are analysed in the context of the unified interpretation of the Hubble flow, plastic flow and super plastic flow [1-6].

Cosmic Micromechanics Connection with Irreversible Deformation Processes in Spatially Extended Crystalline Systems

2007 ◽  
Vol 561-565 ◽  
pp. 1927-1930 ◽  
Author(s):  
Juan Daniel Muñoz-Andrade
Keyword(s):  
Plastic Flow ◽  
Irreversible Deformation ◽  
Spatially Extended ◽  
Super Plastic ◽  
Deformation Processes ◽  
Edwin Hubble ◽  
The Universe ◽  
Physical Construction ◽  
Relativistic Framework ◽  
Hubble Flow

The goal of this work is to describe the cosmic micromechanics connection with irreversible deformation processes in spatially extended polycrystalline systems, where the nature of the crystalline structure of the universe in a relativistic framework at Max Plank scale and Edwin Hubble scale play and important role. In this physical construction by applying the theoretical model of Muñoz-Andrade the activation energy for irreversible deformation processes in spatially extended polycrystalline systems is obtained. Consequently, the main results of this work are analyzed in the context of the unified interpretation of Hubble flow, plastic flow and super plastic flow.

Threshold Stress for Super Plastic Flow in Spatially Extended Crystalline Systems

2005 ◽  
Vol 475-479 ◽  
pp. 3013-3016 ◽  
Author(s):  
Juan Daniel Muñoz-Andrade
Keyword(s):  
Applied Stress ◽  
Threshold Stress ◽  
High Stress ◽  
Stress Region ◽  
Region I ◽  
Spatially Extended ◽  
Super Plastic ◽  
Sigmoidal Curve ◽  
Deformation Processes ◽  
Region Ii

In general, the mechanical behavior of superplastic spatially extended crystalline systems (SP-SECS) is characterized by a sigmoidal relationship between the applied stress and the steady state strain rate. The sigmoidal curve is defined by three regions: low stress - region I, intermediate stress or superplastic - region II and high stress - region III. The region I is known as the region where the threshold stress exists, but there are controversies on their existence. In this way, some experimental results reported in the past are analyzed. Earlier investigations have reported the apparent activation energy for creep in SP-SECS as a function of the applied stress, where it is exhibited a marked dependence of impurities or precipitates concentration. In addition, recent experimental evidences have revealed that the unified interpretation of creep, plasticity and superplasticity is the deductive rule [1]. In order to describe the interaction between precipitates at grain boundaries and dislocations during deformation processes a phenomenological expression for the threshold stress at the Grain Boundary in SP-SECS is described in this work.

Walter Benjamin's media theory and the tradition of the media diaphana

2016 ◽  
Vol 7 (1) ◽  
pp. 9-26
Author(s):  
Antonio Somaini
Keyword(s):  
Sensory Experience ◽  
Media Theory ◽  
Depth Analysis ◽  
Spatially Extended ◽  
The Media ◽  
Aristotelian Tradition

"The article presents an in-depth analysis of Benjamin’s use of the German term Medium, in order to show how his entire media theory may be interpreted as centered on the interaction between the historically changing realm of the technical and material Apparate, and what he calls in the artwork essay the »Medium of perception«: the spatially extended environment, the atmosphere, the milieu, the Umwelt in which sensory experience occurs. This notion of »Medium of perception« is then located within the long, post-Aristotelian tradition of the media diaphana, whose traces can be found in the 1920s and 1930s in the writings of authors such as Béla Balázs, Fritz Heider, and László Moholy-Nagy. </br></br>Der Artikel präsentiert eine eingehende Analyse von Benjamins Gebrauch des deutschen Begriffs »Medium«, um zu zeigen, dass seine gesamte Medientheorie fokussiert ist auf die Interaktion zwischen dem historisch veränderlichen Bereich der technischen und materiellen Apparate einerseits und dem, was er in dem Kunstwerkaufsatz das »Medium der Wahrnehmung« nennt: die räumlich ausgedehnte Umgebung, die Atmosphäre, das Milieu, die Umwelt, in der sinnliche Wahrnehmung erfolgt. Dieser Begriff des »Mediums der Wahrnehmung« wird dann innerhalb der langen, nacharistotelischen Tradition der media diaphana verortet, deren Spuren in den 1920er und 1930er Jahren in den Schriften von Autoren wie Béla Balázs, Fritz Heider und László Moholy-Nagy zu finden sind."

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