Composing Fine-Grained Parallel Algorithms for Spatial Dynamics Simulation

2005 ◽  
pp. 99-113 ◽  
Author(s):  
Olga Bandman
Keyword(s):  
Parallel Algorithms ◽  
Spatial Dynamics ◽  
Dynamics Simulation ◽  
Fine Grained

Molecular Dynamics Based Study on Ductility Enhancement Effect of Nano-scale Void in Fine-grained Metallic Materials

2012 ◽  
Vol 1470 ◽  
Author(s):  
Shin Taniguchi ◽  
Toshihiro Kameda ◽  
Toshiyuki Fujita
Keyword(s):  
Molecular Dynamics ◽  
Grain Size ◽  
Dynamics Simulation ◽  
Transgranular Fracture ◽  
Metallic Materials ◽  
Void Size ◽  
Dislocation Activity ◽  
Fine Grained ◽  
Nano Scale ◽  
Activity Enhancement

ABSTRACTIn fine-grained metallic materials, the dominant grain boundary (GB) process, such as dislocation emission, dislocation absorption, and dislocation pile-up, causes non-uniform deformation, which results in high yield stress and low ductility. When a nano-scale void is introduced, the dislocation activity enhancement around the void could inhibit GB fracture and enhance ductility. In this study, by considering nanocrystalline Cu models, the influence of an intragranular nano-scale void on the fracture process has been investigated through molecular dynamics simulation. The dependence of ductility enhancement on the grain size and void size has especially been discussed at low and room temperatures. Sufficient dislocation activity enhancement accompanied by optimal void growth causes a fracture mode transition from GB fracture to transgranular fracture. While the ductility enhancement strongly depends on the void size at low temperature, it depends on the grain size at room temperature. The strong dependence of ductility enhancement on the temperature is found in the case of relatively small grains.

scholarly journals Distortion of a polycrystalline Al bar in a vice fixture: molecular dynamics analysis of grain movement and rotation

2021 ◽  
Author(s):  
Vardan Hoviki Vardanyan ◽  
Barbara S. Linke ◽  
Herbert M. Urbassek
Keyword(s):  
Molecular Dynamics ◽  
Grain Boundary ◽  
Center Of Mass ◽  
Dynamics Simulation ◽  
Coarse Grained ◽  
Mass Motion ◽  
Fine Grained ◽  
Loading Process ◽  
Dislocation Plasticity ◽  
Load Release

AbstractThe deformation of a nano-sized polycrystalline Al bar under the action of vice plates is studied using molecular dynamics simulation. Two grain sizes are considered, fine-grained and coarse-grained. Deformation in the fine-grained sample is mainly caused by grain-boundary processes which induce grain displacement and rotation. Deformation in the coarse-grained sample is caused by grain-boundary processes and dislocation plasticity. The sample distortion manifests itself by the center-of-mass motion of the grains. Grain rotation is responsible for surface roughening after the loading process. While the plastic deformation is caused by the loading process, grain rearrangements under load release also contribute considerably to the final sample distortion.

scholarly journals Distortion of a poly-crystalline Al bar in a vice fixture: Molecular dynamics analysis of grain movement and rotation

2021 ◽  
Author(s):  
Vardan Hoviki Vardanyan ◽  
Barbara S Linke ◽  
Herbert M Urbassek
Keyword(s):  
Center Of Mass ◽  
Dynamics Simulation ◽  
Coarse Grained ◽  
Mass Motion ◽  
Fine Grained ◽  
Loading Process ◽  
Dislocation Plasticity ◽  
Coarse Grained Sample ◽  
Final Sample ◽  
Load Release

Abstract The deformation of a nano-sized polycrystalline Al bar under the action of vice plates is studied using molec- ular dynamics simulation. Two grain sizes are considered; deformation in the fine-grained sample is mainly caused by grain-boundary processes (sliding and rotation), while dislocation plasticity dominates in the coarse- grained sample. We show that the sample distortion is reflected by the center-of-mass motion of the grains. Grain rotation is responsible for surface roughening after the loading process. While the plastic deformation is caused by the loading process, grain rearrangements under load release also contribute considerably to the final sample distortion.

Portraits of Women’s Paid Domestic-Care Labour

2018 ◽  
Vol 13 (2) ◽  
pp. 123-140 ◽  
Author(s):  
Shalini Grover ◽  
Thomas Chambers ◽  
Patricia Jeffery
Keyword(s):  
Spatial Dynamics ◽  
Emotional Labour ◽  
Fine Grained ◽  
Care Workers ◽  
The Everyday ◽  
Domestic Labour ◽  
Care Economy ◽  
Complex Relationships ◽  
Paid Domestic Labour ◽  
Domestic Care

Our introduction to this Special Issue draws out themes from all four articles which focus on India’s domestic-care economy: women’s paid domestic labour, care work and surrogacy. Through fine-grained ethnographic detail, all the articles nuance questions around agency and resistance, and actively challenge the ‘passive victim’ stereotype that continues to be the primary imaginary in many representations of domestic-care workers. We describe how the articles detail the intimacy, emotional labour and complex spatial dynamics inherent within a sector that often involves working in the homes of others, caring for children, and complex relationships with employers. Additionally, we show how care workers encounter quotidian forms of bodily control, distancing, segregation, authority, stigma, coercion, punitive sanctions and exploitation embedded in the intersections of class, race, caste, gender and ethnicity. To provide a wider framing for the articles, we utilize this introduction to situate them within broader historical and geographical contexts. Thus, we consider how global care chains (GCCs), labour markets, migration, and colonial/postcolonial considerations interplay in shaping the everyday lives of domestic-care workers in contemporary globalizing India.

Sign in / Sign up

Export Citation Format

Share Document