Activation Energy for Irreversible Deformation Processes in Spatially Extended Crystalline Systems

2004 ◽  
Author(s):  
Juan D. Muñoz-Andrade
Keyword(s):  
Activation Energy ◽  
Irreversible Deformation ◽  
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.

Activation Energy of Superplastic Deformation Processes in Aluminium Alloys

1991 ◽  
Vol 66-69 ◽  
pp. 1413-1420
Author(s):  
András Juhász ◽  
Nguyen Q. Chinh ◽  
P. Tasnádi ◽  
I. Kovács ◽  
T. Torma ◽  
...  
Keyword(s):  
Activation Energy ◽  
Aluminium Alloys ◽  
Superplastic Deformation ◽  
Deformation Processes
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