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: The mechanical response of epoxy resin Epon E 863 has been studied in tension, compression, and flexure as mentioned in this paper, and the epoxy resins have been tested at different strain rates ranging from 5.9×10-5 to 0.03 s-1.1
Abstract: The mechanical response of epoxy resin Epon E 863 has been studied in tension, compression, and flexure. The epoxy resins have been tested at different strain rates ranging from 5.9×10-5 to 0.03 s-1. Two types of dog-bone geometries have been used in the tension tests. Small sized cubic, prismatic, and cylindrical samples were used in compression tests. Beams with quarter deep notches or grooves were tested at their midpoints in flexural tests. Strains were measured by using a digital image correlation technique, extensometer, strain gages, and actuator. Observation of sample geometry during tension tests at constant elongation rate shows necking and crazing in Epon E 863. Cubic, prismatic, and cylindrical compression samples undergo a stress drop at yield, but only cubic samples experience strain hardening before failure. Characteristic points of tensile and compressive stress strain relation and load deflection curve in flexure, such as proportional elastic limit stress (PEL), ultimate tensile ...
50 citations
TL;DR: In this paper, the authors developed a theoretical model and included it in a general continuum framework to explain the "forced" elasticity observed in slowly propagating polymeric necks, and also briefly analyzed the viscoelastic effects and dissipative heat generation when polymer necks propagate fast enough.
50 citations
TL;DR: In this article, it was proposed that the Marciniak and Kuczynski analysis should be applied to a material from the time diffuse necking sets in and the total limit strain will then be the sum of the strain up to general instability and the strain necessary to give a localized neck.
50 citations
TL;DR: In this paper, a grid technique was used to determine the inhomogeneous strain field associated with a steadily growing neck and an extension of photoelasticity was used in obtaining the stress variation along the line of symmetry in the neck.
50 citations
TL;DR: In this article, a stress-based forming limit was utilized for through-thickness necking analysis to explain this uncovered question. But the authors did not consider the gradient stress profile following the deformation history for the proper forming limit analysis.
50 citations