Searched for: subject%3A%22Dislocation%255C+dynamics%22
(1 - 9 of 9)
document
Civiero, R. (author), Perez-Rafols, F. (author), Nicola, L. (author)
The effect of the presence of a passivation layer on a metal rough surface during contact loading is investigated by means of dislocation dynamics simulations. The metal body is modeled as an FCC single crystal with a self-affine rough surface that is either bare, or covered by a thin coating, impenetrable to dislocations. This analysis...
journal article 2023
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Irani, N. (author), Murugesan, Yaswanth (author), Ayas, C. (author), Nicola, L. (author)
Discrete dislocation plasticity is a modeling technique that treats plasticity as the collective motion of dislocations. The dislocations are described through their elastic Volterra fields, outside of a cylindrical core region, with a few Burgers vectors of diameter. The contribution of the core fields to the dislocation dynamics is...
journal article 2022
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Zheng, Yiwen (author)
Plasticity accompanied by dislocation motion is the essential property of metals. A large number of crystal plasticity models have been developed to predict the mechanical response in the work hardening regime while little attention is paid to pre-yield behavior. In this work, we propose a novel model both pre-yield and post-yield from a...
master thesis 2021
document
Parayil Venugopalan, S. (author)
doctoral thesis 2019
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Parayil Venugopalan, S. (author), Nicola, L. (author)
Although indentation of elastic bodies by self-affine rough indenters has been studied extensively, little attention has so far been devoted to plasticity. This is mostly because modeling plasticity as well as contact with a self-affine rough surface is computationally quite challenging. Here, we succeed in achieving this goal by using Green...
journal article 2019
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Parayil Venugopalan, S. (author), Irani, N. (author), Nicola, L. (author)
Persson's theory allows for a fast and effective estimate of contact area and contact stress distributions when a flat and a self-affine rough surface are pressed into contact. For elastic bodies, the results of the theory have been shown to be in very good agreement with rather costly simulations. The theory has also been extended to plastic...
journal article 2019
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Dikken, R.J. (author)
Sustainability has become an integral part of todays society. A thorough understanding of friction as a major cause of energy dissipation is therefore highly relevant. Friction of rough surfaces in contact is a physical phenomenon that involves multiple length- and time-scales, complicating a full understanding of friction. The fundamental study...
doctoral thesis 2017
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Parayil Venugopalan, S. (author), Mueser, Martin H. (author), Nicola, L. (author)
Metals deform plastically at the asperity level when brought in contact with a counter body even when the nominal contact pressure is small. Modeling the plasticity of solids with rough surfaces is challenging due to the multi-scale nature of surface roughness and the length-scale dependence of plasticity. While discrete-dislocation plasticity ...
journal article 2017
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Sun, F. (author)
The ultimate objective of this work is to gain a better understanding of the plastic behavior of rough metal surfaces under contact loading. Attention in this thesis focuses on the study of single and multiple asperities with micrometer scale dimensions, a scale at which plasticity is known to be size dependent. The asperities have very simple...
doctoral thesis 2016
Searched for: subject%3A%22Dislocation%255C+dynamics%22
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