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plastic deformation

mohsenzaeem's picture

Role of grain boundaries in determining strength and plastic deformation of yttria-stabilized tetragonal zirconia bicrystals

Mechanical properties of yttria-stabilized tetragonal zirconia (YSTZ) bicrystals under compressive loading are investigated by atomistic simulations. Previous studies on deformation of single-crystal YSTZ showed that some specific orientations promote dislocation emission, tetragonal to monoclinic phase transformation, or both. In this work, nanograins with different orientations are selectively combined to generate bicrystals with various grain boundaries (GBs).

dabiao liu's picture

Stress gradient plasticity

 Liu, D., He, Y., Zhang, B., 2013. Towards a further understanding of dislocation pileups in the presence of stress gradients.  Doi: 10.1080/14786435.2013.774096

http://www.tandfonline.com/doi/abs/10.1080/14786435.2013.774096#preview

Ravi-Chandar's picture

Post-doctoral position at the University of Texas

The Research Center for Mechanics of Solids, Structures and Materials at the University of Texas at Austin invites applications for an open position as Post-doctoral Fellow. The specific project involves the characterization of the constitutive and failure behavior of structural materials (aluminum alloys, steels, titanium alloys, metal-matrix composites, polymers and other selected materials) under quasi-static and dynamic conditions.

hasanzhong's picture

Finite-Element Analysis of Current-Induced Thermal Stress n a Conducting Sphere

Understanding the electrothermal-mechanical behavior of electronic inter-
connects is of practical importance in improving the structural reliability of
electronic devices. In this work, we use the finite-element method to analyze
the Joule-heating-induced thermomechanical deformation of a metallic sphere
that is sandwiched between two rigid plates. The deformation behavior of the
sphere is elastic–perfectly plastic with Young’s modulus and yield stress
decreasing with temperature. The mechanical stresses created by Joule

gthompson1's picture

Post Doctoral Appointment in Deformation-Microstructure Modeling

Professor Gregory B. Thompson at the University of Alabama seeks post doctoral applicants for projects related to deformation modeling and oxidation in high temperature ceramic systems.  The qualified candidate will use modeling to explain and help direct experimental studies.

Amit Pandey's picture

Evoution of Yield surfaces: Past and Future Trend - Part 3

 My last two posts on this series

Part- 1 (node/9016) and

Part- 2 (node/9073)

were mainly focussed on the tension–torsion (σ11–√3σ12) stress space. This paper will be the final post on this series and will focus mainly on the behavior of  both of these alloys under tension–tension (σ11–σ22)space and conclude this ongoing research.

Abstract.

Superplastic carbon nanotubes

Nature 439, 281 (2006)

The theoretical maximum tensile strain — that is, elongation — of a single-walled carbon nanotube is almost 20%, but in practice only 6% is achieved. Here we show that, at high temperatures, individual single-walled carbon nanotubes can undergo superplastic deformation, becoming nearly 280% longer and 15 times narrower before breaking. This superplastic deformation is the result of the nucleation and motion of kinks in the structure, and could prove useful in helping to strengthen and toughen ceramics and other nanocomposites at high temperatures.

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