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 article, the natural draw ratio of metallocen catalyzed high density polyethylenes was investigated with different crosshead speeds, molecular weights, and the cross-section shapes of sample specimens.
45 citations
TL;DR: In this paper, a modified version of the Swift law is proposed to describe the evolution of the mechanical behavior in reloading of prestrained materials, including the effect of strain path change.
45 citations
TL;DR: In this paper, the authors investigate seven transects crossing the rifted margin around the North Atlantic which display considerable variations in subsidence, crustal thickness variations, and gravity signatures.
Abstract: Regional isostatic adjustment of the buoyancy forces created by lithospheric stretching during rifting is used to predict the crustal structure and gravity anomalies across rifted continental margins. Following earlier studies, we assume that stretching and necking of the lithosphere occurs around a “depth of necking,” which is the level of no vertical motion in the absence of gravitational forces. Differences in the depth of necking, coupled with lateral variation in flexural rigidity, can account for many of the variations in tectonic style observed across rifted continental margins and associated rifted basins. We investigate here seven transects crossing the rifted margin around the North Atlantic which display considerable variations in subsidence, crustal thickness variations, and gravity signatures. These are located where high-quality seismic data are available as a constraint. Two conjugate margin segments are included to test for asymmetry in depth of necking which might be evidence of a simple shear mode of extension. Results suggest that both shallow (3 to 10 km) and deep (20 to 25 km) depths of necking occur. The depth of necking appears to be related to the intrinsic strength maximum within the lithosphere, rather than to the depth of preexisting structure. Shallower depths of necking may result from heating of the lithosphere during extension which decreases the depth of maximum strength. Deeper depths of necking may occur when the rates of extension are low and significant heating of the lithosphere does not occur. The depth of necking on at least one margin transect gives results very similar to a locally (Airy) compensated model, even though the lithosphere exhibits finite strength. Both conjugate margin segments display shallow depths of necking and favor a pure shear rather than a simple shear mode of extension.
45 citations
TL;DR: In this article, a fracture criterion based on local strain measures in tension has been identified for both materials and a particular attention has been paid to the modelling and identification of the constitutive law in a large strain range, and then numerical predictions of the strain limits obtained from successful parts were compared to experimental results.
45 citations
TL;DR: In this article, experimental and theoretical analyses were performed to predict the failure strain of EDD and AA5052 sheet metals, and the results were successfully validated with the experimental data.
45 citations