research

Transverse wrinkles usually occur in a uniaxially tensile elastic membrane and will be smoothed upon excess stretching. This instability-restabilization response (isola-center bifurcation) can originate from the nonlinear competition between stretching energy and bending energy. Here, we find a crucial factor, the curvature, which can control effectively and precisely the wrinkling and smoothing regimes. When the sheet is bent, the regime of wrinkling amplitude versus membrane elongation is narrowed, with local wrinkling instability coupled with global bending.

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

Full text is available here

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.