scholarly journals Practical Foundations of History Independence

2016 ◽  
Vol 11 (2) ◽  
pp. 303-312 ◽  
Author(s):  
Sumeet Bajaj ◽  
Anrin Chakraborti ◽  
Radu Sion
Keyword(s):  
History Independence

Physically based modeling of cyclic plasticity for highly oriented nanotwinned metals

2021 ◽  
pp. 1-28
Author(s):  
Wufan Chen ◽  
Haofei Zhou ◽  
Wei Yang
Keyword(s):  
Fatigue Life ◽  
Cyclic Deformation ◽  
Engineering Application ◽  
Back Stress ◽  
Cyclic Plasticity ◽  
Dissipation Energy ◽  
Twin Lamella ◽  
History Independence ◽  
Physically Based ◽  
Precise Prediction

Abstract Fatigue resistance is crucial for the engineering application of metals. Polycrystalline metals with highly oriented nanotwins have been shown to exhibit a history-independent, stable and symmetric cyclic response [Pan et al. Nature 551 (2017) 214-217]. However, a constitutive model that incorporates the cyclic deformation mechanism of highly oriented nanotwinned metals is currently lacking. This study aims to develop a physically based model to describe the plastic deformation of highly oriented nanotwinned metals under cyclic loading parallel to the twin boundaries. The theoretical analysis is conducted based on a non-uniform distribution of twin boundary spacing measured by experiments. During cyclic plasticity, each twin lamella is discretely regarded as a perfect elastoplastic element with a yielding strength depending on its thickness. The interaction between adjacent nanotwins is not taken into consideration according to the cyclic plasticity mechanism of highly oriented nanotwins. The modeling results are well consistent with the experiments, including the loading-history independence, Masing behavior and back stress evolution. Moreover, the dissipation energy during cyclic deformation can be evaluated from a thermodynamics perspective, which offers an approach for the prediction of the fatigue life of the highly oriented nanotwins. The cyclic plasticity modeling and fatigue life prediction are unified without fatigue damage parameters. Overall, our work lays down a physics-informed framework that is critical for the precise prediction of the unique cyclic behaviors of highly oriented nanotwins.

scholarly journals History independence of steady state in simultaneous two-phase flow through two-dimensional porous media

2013 ◽  
Vol 88 (5) ◽  
Author(s):  
Marion Erpelding ◽  
Santanu Sinha ◽  
Ken Tore Tallakstad ◽  
Alex Hansen ◽  
Eirik Grude Flekkøy ◽  
...  
Keyword(s):  
Porous Media ◽  
Steady State ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Dimensional ◽  
Two Phase ◽  
History Independence ◽  
Flow Through

Experimental Evidence of Temperature Path Independence in the Polycrystalline Alloy Ni3AI

1995 ◽  
Vol 117 (4) ◽  
pp. 478-482 ◽  
Author(s):  
G. Webb ◽  
S. D. Antolovich
Keyword(s):  
Dislocation Substructure ◽  
Deformation Characteristic ◽  
Thermally Activated ◽  
Path Independence ◽  
History Independence ◽  
Polycrystalline Alloy ◽  
Different Temperatures ◽  
Deformation Processes ◽  
Thermal Reversibility ◽  
Temperature Path

The results from a series of elevated temperature prestrain experiments on a hypostoichiometric polycrstalline Ni3Al are presented. Experiments were conducted to examine the deformation characteristic of “thermal reversibility” or temperature path history independence (TPHI). Temperature path history independence was experimentally observed from prestraining experiments (also known as Cottrell-Stokes experiments) in which the specimen was deformed at different temperatures; the results were compared to those obtained from tests conducted at constant temperature. The purpose of such experiments was to macroscopically evaluate the effects of intrinsic dislocation mobility and dislocation substructure on deformation. These experiments provide a framework in which to evaluate fundamental characteristics of thermally activated deformation processes. The results for polycrystalline Ni3Al alloys indicate that the mechanisms responsible for thermal strengthening is independent of prior deformation history. This observation implies that the mechanism of anomalous strengthening in such alloys is fully reversible and independent of the development of a dislocation “substructure”.

scholarly journals Agendas in legislative decision‐making

2021 ◽  
Vol 16 (1) ◽  
pp. 235-274
Author(s):  
Sean Horan
Keyword(s):  
Decision Making ◽  
Social Choice ◽  
Broad Class ◽  
Structural Features ◽  
History Independence ◽  
The Social ◽  
Wide Range ◽  
Anglo American ◽  
Social Choice Rules ◽  
Legislative Decision

Despite the wide variety of agendas used in legislative settings, the literature on sophisticated voting has focused on two formats: the so‐called Euro–Latin and Anglo–American agendas. In the current paper, I introduce a broad class of agendas whose defining structural features—history‐independence and persistence—are common in legislative settings. I then characterize the social choice rules implemented by sophisticated voting on agendas with these two features. I also characterize the rules implemented by more specialized formats (called priority agendas and convex agendas) whose structure is closely related to the prevailing rules for order‐of‐voting used by legislatures. These results establish a clear connection between structure and outcomes for a wide range of legislative agendas.

Shear History Independence in Colloidal Aggregation

Langmuir ◽  
2012 ◽  
Vol 28 (31) ◽  
pp. 11337-11342 ◽  
Author(s):  
William R. Heinson ◽  
Christopher M. Sorensen ◽  
Amitabha Chakrabarti
Keyword(s):  
Colloidal Aggregation ◽  
History Independence ◽  
Shear History

MODELLING FRUIT QUALITY IN VARIABLE TEMPERATURE SCENARIOS: CAN WE ASSUME HISTORY INDEPENDENCE?

2005 ◽  
pp. 165-171 ◽  
Author(s):  
A.R. East ◽  
A.J. Mawson ◽  
D.J. Tanner ◽  
K.M. Maguire ◽  
J. Jobling
Keyword(s):  
Fruit Quality ◽  
Variable Temperature ◽  
History Independence

scholarly journals HISTORY OF THE PEOPLE 'S COMMISSARIAT FOR NATIONAL AFFAIRS OF THE TURKISTAN ASSR (1918-1922)

2020 ◽  
pp. 308-310
Author(s):  
Komilov Abdusalim
Keyword(s):  
Key Words ◽  
The People ◽  
History Independence ◽  
History Of

It is well known from history that, in the history of the multi-ethnic people, national issues are of paramount importance. Since the first years of independence, the interest of our people in knowing their Motherland, its language, culture, values and history has increased. KEY WORDS: history, independence, capacity, council, committee, culture, developed people.

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