Topic
Necking
About: Necking is a research topic. Over the lifetime, 5280 publications have been published within this topic receiving 113945 citations.
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NEC1
TL;DR: Amorphous silica structures are shown to become unstable under intense electron irradiation against plastic deformation, necking, and failure as mentioned in this paper, and local clustering is seen during fluctuations in the microscopic structure.
Abstract: Amorphous silica structures which are a few nanometres in width and tens of nanometres in length are seen to become unstable under intense electron irradiation against plastic deformation, necking and failure. Similarly irradiated atomistically sharp tips, which are observed to be stable in crystalline materials, undergo rapid blunting in amorphous structures, caused by evaporation and enhanced viscous flow. The tip extremities separate into spherical bulbs by necking, and local clustering is seen during fluctuations in the microscopic structure. The observations provide information on the nature of microscopic diffusion and flow, during kinetic phenomena such as failure of amorphous structures.
31 citations
Patent•
[...]
05 Jan 1973
TL;DR: In this paper, the problem of necking in a can body for the purpose of applying smaller diameter or special ends thereon was addressed by first necking-in a larger than normal end portion of the can body to an intermediate diameter and then utilizing tooling for performing the desired necking.
Abstract: This disclosure relates to the necking-in of can bodies for the purpose of applying smaller diameter or special ends thereon. Previously experienced extreme difficulties in properly neckingin can bodies have been eliminated by first necking-in a larger than normal end portion of a can body to an intermediate diameter and then utilizing tooling for performing the desired necking in operation to further neck-in the extreme end portion only of the previously necked-in longer end portion.
31 citations
TL;DR: In this article, a rate-independent polycrystalline sheet is considered to be bifurcation from the homogeneous deformation state or to result from the growth of preexisting imperfections.
31 citations
TL;DR: Boudinage structures have only rarely been reported in glacier ice, yet they seem to be widespread in Swiss glaciers as mentioned in this paper, where the principal compressive strain axis lies at a high angle to the layering.
Abstract: Boudinage structures have only rarely been reported in glacier ice, yet they seem to be widespread in Swiss glaciers They form in debris-free, strongly foliated ice by the stretching, necking and rupture of layers or groups of layers, when the principal compressive strain axis lies at a high angle to the layering Two main types of boudinage are distinguished The first results from the difference in competence between fine-grained and coarse-grained ice, and indicates that the former is more resistant to flow than the latter The second occurs in more equigranular ice which shows a strong planar anisotropy; associated with the necking of such ice is the development of shear planes, along which the layers are displaced As in deformed rocks, it is not possible to determine the directions of the finite principal strain axes from the boudinage structures alone Although the boudins described here all occur in longitudinal foliation, it is suggested that they are likely to form in other situations also
31 citations
TL;DR: In this paper, the authors proposed an approach to predict shear fractures by instability at die radii, represented by maximum applied tensile force as a function of die radius. And they found that the critical radius (normalized by sheet thickness: R / t crit ), above which materials will fail in tension, independent of the die radius, and correspondingly localized shear fracture would not occur.
31 citations