Scaling theory of continuum dislocation dynamics in three dimensions: Self-organized fractal pattern formation
Y. S. Chen, W. Choi, S. Papanikolaou, M. Bierbaum, J. P. Sethna
Eighty Years of Dislocation Theory and Work Hardening
On February 7, 1934, two consecutive papers by Sir Geoffrey Ingram Taylor were received and so the dislocation theory was born and the first attempt at describing work hardening was made. Before that date, it was known that there was a big gap between the ideal and the experimentally observed shear strength. While according to the calculations, the shear strength had to be of the order of one tenth (or with finer models one thirtieth) of the shear modulus, the measured shear strength was several orders of magnitude smaller. This large discrepancy brought about Geoffrey I.Taylor, Egon Orowan and Michael Polyani to independently postulate the existence of dislocations. Papers by Orowan and Polyani were published consecutively in one volume of Zeitschrift für Physik.
Caltech: secrets of the world’s number one university
Good International news on Caltech and engineering. Ares Rosakis, chair of the Division of Engineering and Applied Science,describes Caltech as “a unique species among universities…a very interesting phenomenon”.More can be found in the attachment or at the link below
http://www.timeshighereducation.co.uk/features/caltech-secrets-of-the-w…
instability induced by incoherent twin boundary in nanotwinned copper
1. Strain hardening and softening in nanotwinned Cu:
Nanotwinned Cu foils with about 99% coherent twin boundaries (TBs) among all the boundaries were made. These coherent
TBs, with an average spacing of 25 nm, were engineered approximately parallel to foil surfaces. Low plane-strain deformation
enhances the hardness by refining microstructure and introducing dislocations. High plane-strain deformation results in crystallographic
lattice rotation and reaction between dislocations and coherent TBs, and induces incoherent TBs, thus twin coarsening and
Call for Abstracts for IMECE 2014: topic 11-13: Nanomaterials for Energy and publish in Journal of Nanotechnology in Engineering
Dear Colleagues,
The ASME Journal of Nanotechnology in Engineering and Medicine (JNEM) has agreed to accept and publish high-quality conference proceedings that will be presented in the upcoming ASME IMECE 2014 “Topic 11-13 “Nanomaterials for Energy” (http://www.asmeconferences.org/congress2014/).
Early Bird gets the...... Discount!
Way less gross than worms ;) Register today for the SIMULIA Community Conference and save $200!
http://bit.ly/SCC14EB
UPDATED: Nanobrücken 2014 Nanomechanical Testing Workshop
Dear Colleague: You are cordially invited to participate in the Nanobrücken 2014 Nanomechanical Testing Workshop, which will take place March 26-28, 2014 at INM - Leibniz Institute for New Materials in Saarbrücken, Germany. This will be the 4th edition of the annual Nanobrücken workshop series. This year's Keynote Speaker will be Andrew Minor (University of California, Berkeley).
Post-doctorate Positions in Offshore Engineering at National University of Singapore
The Department of Civil and Environmental Engineering at the National University of Singapore (NUS) is recruiting 2 post-doctorate research fellows to pursue research on ice-structure interaction in the Keppel-NUS Corporate Laboratory. As part of the S$75 million collaboration between Keppel Corporation and NUS, the team comprising of Prof. Andrew Palmer, Dr. Bai Wei, and Dr. Pang Sze Dai, seeks to develop solutions for offshore rigs to meet the challenges of harsh arctic environments in oil and gas exploration and production.
