Results 11 to 20 of about 88,198 (304)

The dislocation configurational energy density in discrete dislocation plasticity [PDF]

Journal of the Mechanics and Physics of Solids, 2019
Abstract Dislocation configurational energy is the term assigned to describe the elastically-stored energy associated with the interaction of dislocations and their structures. It is the energy which is over and above that from the summation of the dislocation line energies when considered isolated and non-interacting.
Zheng, Z, Prastiti, NG, Balint, DS, Dunne, FPE   +3 more
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Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures

Metals
The complex thermal cycles during the solidification process in metal additive manufacturing (AM) lead to the formation of high-density dislocation networks, organizing into submicron-scale cellular structures.
Md Mahabubur Rohoman, Caizhi Zhou
doaj   +2 more sources

Predicting Dislocation Density in Martensite Ab-Initio [PDF]

SSRN Electronic Journal, 2022
The high dislocation density (ρd) in Fe-C and/or Fe-N martensite is known to be one of the main causes of its overall yield strength. Experiments indicate that the dislocation density and, therefore, the yield strength of martensite in low and medium C steels, follows a well defined behavior with respect to the background concentration of C (c0).
Predrag Andric, Sebastián Echeverri Restrepo, Francesco Maresca   +2 more
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High dislocation density of tin induced by electric current

AIP Advances, 2015
A dislocation density of as high as 1017 /m2 in a tin strip, as revealed by high resolution transmission electron microscope, was induced by current stressing at 6.5 x 103 A/ cm2. The dislocations exist in terms of dislocation line, dislocation loop, and
Yi-Han Liao, Chien-Lung Liang, Kwang-Lung Lin, Albert T. Wu   +3 more
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Effect of Dislocation Density on the Dynamic Strength of Aluminium

Journal of Dynamic Behavior of Materials
AbstractThe effects of cold work on dynamic flow strength is studied through measurements of dislocation density and elastic precursor attenuation in shocked aluminium. High-purity aluminium and Al 6082 alloy samples are subjected to up to three passes of rotary swaging, a severe plastic deformation (SPD) technique, in order to produce large variations
Jonsson, JC, Chapman, DJ, Farbaniec, L, Escauriza, EM, Smith, LC, Eakins, DE   +5 more
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Microstructural Evolution along the NiCrMoV Steel Welded Joints Induced by Low-Cycle Fatigue Damage

Metals, 2021
The degradation of mechanical properties of materials is essentially related to microstructural changes under service loadings, while the inhomogeneous degradation behaviors along welded joints are not well understood.
Shuo Weng, Yuhui Huang, Mingliang Zhu, Fuzhen Xuan   +3 more
doaj   +1 more source

Annihilation and sources in continuum dislocation dynamics

Materials Theory, 2018
Continuum dislocation dynamics (CDD) aims at representing the evolution of systems of curved and connected dislocation lines in terms of density-like field variables. Here we discuss how the processes of dislocation multiplication and annihilation can be
Mehran Monavari, Michael Zaiser
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An improved dislocation density reliant model to address the creep deformation of reduced activation ferritic martensitic steel

Forces in Mechanics, 2022
The blanket module of nuclear fusion reactor is proposed to be made of reduced activation ferritic martensitic (RAFM) steel. Thus, in order to prevent the unprecedented failure, the creep response of RAFM steel must be studied meticulously.
Nilesh Kumar, Alen S. Joseph, Pankhuri Mehrotra, Surya D. Yadav   +3 more
doaj   +1 more source

Dislocations Jam at Any Density

Physical Review Letters, 2011
Crystalline materials deform in an intermittent way via dislocation-slip avalanches. Below a critical stress, the dislocations are jammed within their glide plane due to long-range elastic interactions and the material exhibits plastic response, while above this critical stress the dislocations are mobile (the unjammed phase) and the material fails. We
Tsekenis, Georgios, Goldenfeld, Nigel, Dahmen, Karin A.   +2 more
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An Observation on the Experimental Measurement of Dislocation Density [PDF]

Journal of Elasticity, 2013
The common practice of ignoring the elastic strain gradient in measurements of geometrically necessary dislocation (GND) density is critically examined. It is concluded that the practice may result in substantial errors. Our analysis points to the importance of spatial variations of the elastic strain field in relation to its magnitude in inferring ...
Acharya, Amit, Knops, Robin J.
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