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Subject to compression, elastic materials may undergo bifurcation of various kinds. A homogeneous material forms creases, whereas a bilayer consisting of a stiff film and a compliant substrate forms wrinkles. Here, we show several new types of bifurcation behavior for bilayers consisting of films and substrates of comparable elastic moduli. Depending on the ratios of moduli and thicknesses of the two materials, the critical strain for the onset of creases can be either smaller or larger than that for the onset of wrinkles.

Professor John Rogers, Swanlund Chair Professor of Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, was recently elected to the National Academy of Sciences. Congratulations to John!

Here is the link to the NAS press release: http://www.nasonline.org/news-and-multimedia/news/april-28-2015-NAS-Election.html

Dear all,

I am using Abaqus/explicite. My material definition is elasto plastic with stress strain values up to strain of 15!. After borthering tries now I think if I can set "Shear Failure Criteria Element Deletation option", it is possible to avoid this error. But I cannot find this option. Could someone guide me what exactly should I do in order to add distorted element deletation option and how? (an step-by-step tutorial will be approciate)

More Explanation about process:

Up to 10 New Frontiers Fellowships, which provide structured post-doctoral career development pathways to permanent academic positions, are to be appointed in the Faculty of Engineering and the Environment, University of Southampton. Applications are invited from individuals who would strengthen any of our research themes, including Structures and Solid Mechanics, Computational Engineering, Materials and Surface Engineering, Acoustics, Geomechanics and Bioengineering.

Openings at Bioinspired Materials and Structures Lab of USC

The ability of amorphous intergranular films to mitigate damage formation at grain boundaries is studied with molecular dynamics simulations. We find that such films can alter both crack nucleation and crack growth rates by efficiently absorbing dislocations, with thicker films being more effective sinks.