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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TL;DR: In this paper, the authors evaluate the impact of simplifying assumptions in the treatment of the transport equations and the thermal conditions, as well as evaluate the feasibility of adapting simpler models, and find that the necking shape, heat transfer coefficient and furnace temperature profiles have a decisive impact on the overall solution.
62 citations
TL;DR: It was found that the material shows ductile necking in the smooth condition and that this is almost completely suppressed in the notched conditions, while the deformation and fracture micromechanisms changed drastically, from one of plasticDeformation and void coalescence to one dominated by crazing and brittle fast fracture.
62 citations
TL;DR: In this article, the forming limits on various forming process have been investigated using the experimental and FE analysis using the square cup drawing and stamping processes were used to investigate the formability of AZ31 sheet.
62 citations
TL;DR: In this paper, a phenomenological dislocation-based approach is proposed to account for the necking phenomenon during tensile deformation of metals and alloys, and the critical strain corresponding to the onset of tensile instability is predicted in a simple explicit form based on the Kocks-Mecking dislocation kinetics approach.
62 citations
TL;DR: In this article, the effect of grain refinement on room-temperature ductility of copper was investigated and Hart's stability analysis that accounts for strain-rate-sensitivity effects was used.
Abstract: In this letter, we address the effect of grain refinement on room-temperature ductility of copper. Recent experimental results have shown that this material, as well as a number of other single-phase metals that are ductile when coarse grained, lose their ductility with decreasing grain size in the submicrometer range. A recently developed model in which such materials are considered as effectively two-phase ones (with the grain boundaries treated as a linearly viscous second phase) was applied to analyze the stability of Cu against ductile necking. As a basis, Hart’s stability analysis that accounts for strain-rate-sensitivity effects was used [E. W. Hart, Acta Metall. 15, 351 (1967)]. The results confirm the observed trend for reduction of room-temperature ductility with decreasing grain size. The model can be applied to predicting the grain-size dependence of ductility of other metallic materials as well.
61 citations