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IUTAM Symposium on Mechanical Behavior and Micro-Mechanics of Nanostructured Materials : proceedings of the IUTAM symposium held in Beijing, China, June 27-30, 2005 by Lallit Anand, Yujie Wei (auth.), Y. L. Bai, Q. S. Zheng, Y. G. Wei (eds.) is a nonfiction available to read on EtoBox.

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In order to model the effects of grain boundaries in nanocrystalline materials we have coupled a crystal-plasticity model for the grain interiors with a new elastic-plastic grainboundary interface model which accounts for both reversible elastic, as well irreversible inelastic sliding-separation deformations at the grain boundaries prior to failure. We have used this new computational capability to study the deformation and fracture response of nanocrystalline nickel. The results from the simulations capture the macroscopic experimentallyobserved tensile stress-strain curves, and the dominant microstructural inelastic deformation and fracture mechanisms in this material. The macroscopically-observed nonlinearity in the stress-strain response is mainly due to the inelastic response of the grain boundaries. Plastic deformation in the interior of the grains prior to the formation of grain-boundary cracks was rarely observed. The stress concentrations at the tips of the distributed grain-boundary cracks, and at grain-boundary triple junctions, cause a limited amount of plastic deformation in the high-strength grain interiors. The competition of grain-boundary deformation with that in t

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Author
Lallit Anand, Yujie Wei (auth.), Y. L. Bai, Q. S. Zheng, Y. G. Wei (eds.)
Publisher
Springer Netherlands
Published
2007
Language
EN
ISBN
9781402056246
Category
nonfiction
Subjects
Engineering, Technology, Stem

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