research

https://doi.org/10.1016/j.mechmat.2019.103200

Abstract

Just submitted a paper on electroadhesion of rough surfaces, greatly simplifying the recent theory of the great Bo Persson , with hot application to touch screens :  see here. 

Comments welcome.

Additive manufacturing of ceramics from preceramic polymers

Following extensive research by our outstanding doctoral candidate here, Dr. Wang, a publication in the journal Additive Manufacturing is now in press.

Nanostructural insights into the dissolution behavior of Sr-doped hydroxyapatite

https://doi.org/10.1016/j.jeurceramsoc.2018.07.056

Improved oxidation resistance of high emissivity coating s on fibrous ceramic for reusable space systems

Here novel disilicides were explored for use in heat shields. 

WSi2 and MoSi2 were applied as coatings on an insulating zirconia substrate.

The high emissivity of these compounds and their mixtures, makes them very attractive for use in spacecraft.

Compressive performance and crack propagation in MAX phase composites 

Here micro CT was used to reveal the structure performance relationships in metal/ceramic composites based on Ti2AlC / Al alloy combinations.

The results show the promise of infiltrated max phase materials in the production of high performance composites.

Theoretical study into the hydrophobicity exhibited by a representative rare earth oxide, CeO2.

https://www.sciencedirect.com/science/article/pii/S0169433219302399

Abstract

https://www.researchgate.net/publication/336345541_An_introduction_of_the_four-dimensional_lattice_spring_model_UG6_Beijing

The interactions between solute atoms and crystalline defects such as vacancies, dislocations, and grain boundaries are essential in determining alloy properties.

In this paper we discuss the mechanics of anelastic bodies with respect to a Riemannian and a Euclidean geometric structure on the material manifold. These two structures provide two equivalent sets of governing equations that correspond to the geometrical and classical approaches to nonlinear anelasticity. This paper provides a parallelism between the two approaches and explains how to go from one to the other. We work in the setting of the multiplicative decomposition of deformation gradient seen as a non-holonomic change of frame in the material manifold.

Directional solidification of Al-11 at % Cu is investigated by molecular dynamics (MD) simulations utilizing second nearest neighbor modified embedded atom method (2NN-MEAM) interatomic potential. The condition for directional solidification is produced by imposing dissimilar temperatures at the model boundaries along the [1 0 0] solidification direction to create a temperature gradient. During solidification, the solid-liquid front travels through the Al-Cu liquid along the [1 0 0] direction towards the high temperature end.

A criterion for the mean stress effect correction in the shift factor approach for variable amplitude life prediction is presented for both smooth and notched specimens. The criterion is applied to the simple idea proposed by the authors in a previous note that Gaßner curves can be interpreted as shifted Wöhler curves. The mean stress correction used has been proposed by Smith, Watson and Topper and, more in general, by Walker.

https://doi.org/10.1016/j.compscitech.2019.107832

Link to author's personalized share link for free access until November 19 2019: https://authors.elsevier.com/a/1ZpgjyZzKoGVz

Abstract:

A postdoc in the area of flexible skin for morphing wings is available at Khalifa University, UAE. 

This is the preprint of an article that will appear in Computational Materials Science (doi.org/10.1016/j.commatsci.2019.109217)

A 3D phase field dislocation dynamics model for body-centered cubic crystals

We report a manufacturing technology, called conformal additive stamp (CAS) printing and show that it can be used to reliably manufacture electronic devices with 3D shapes. Our CAS printing approach employs a pneumatically inflated elastomeric balloon as a conformal stamping medium to pick up pre-fabricated electronic devices and print them onto 3D surfaces to create devices with curvy shapes including electrically small antennas, hemispherical solar cells and smart contact lenses.

Dear Colleagues,

Here is our recently published article on Symmetry-adapted real-space density functional theory for large nanotubes and bending deformations of thin sheets

Title: Symmetry-adapted real-space density functional theory for cylindrical geometries: Application to large group-IV nanotubes

 Authors: Swarnava Ghosh, Amartya S. Banerjee, Phanish Suryanarayana*

Concise summary