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, a micromechanics-based criterion for void coalescence, combining both forms of anisotropy above, is developed using homogenization and limit analysis of a hollow cylindrical representative volume element made of an orthotropic material of the Hill type.
61 citations
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TL;DR: In this paper, the influence of sorbed water on deformation and fracture behavior of both low and high molecular weight poly(methylmethacrylate) has been investigated and it is suggested that sorbed waters acts as a mild plasticizer for PMMA up to a concentration of about 1.1 % and, at higher water concentration, water clustering occurs.
61 citations
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TL;DR: In this article, a digital image correlation (DIC) method was used to characterize the constitutive tensile stress-strain response in 304L austenitic stainless steel weldments produced by both continuous-wave (CW) and pulsed-wave laser welding.
Abstract: A digital image correlation (DIC) method has been used to characterize the constitutive tensile stress-strain response in 304L austenitic stainless steel weldments produced by both continuous-wave (CW) and pulsed-wave (PW) laser welding. The method provides quantitative two-dimensional (2-D) strain maps of the deformation field across the transverse weld samples throughout the tensile test. Local stress-strain response was extracted from regions within the fusion zone and compared to base metal response. The weldments were found to have a higher yield strength than the base metal. The metallurgical origin for the fusion zone strengthening was largely attributed to Hall-Petch and ferrite content effects. While failures localized in the fusion zone with little appreciable necking, the material within the fusion zone retained considerable local ductility: more than 45 pct strain at failure. Significant weld root porosity found in the PW condition and absent in the CW condition appeared to have no deleterious effect on the mechanical performance under the present test conditions in this very ductile, flaw-tolerant alloy.
61 citations
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TL;DR: In this paper, it was shown that the conditions for plastic instability also follow from linear stability analysis of the intrinsic evolution laws for the dislocation density, and that the strain rate sensitivity effect enters these conditions in a way different to the known Hart criterion.
61 citations
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TL;DR: In this paper, a modified vertex theory is proposed for localized necking of rate-dependent sheet metals. But the vertex theory does not consider the effect of the rate on the formation limit diagrams.
60 citations