On Tuesday 24th October at 3:00 pm (Italian time) Samuel Forest will offer the seminar “Strain gradient plasticity based on saturating internal variables” at the Department of Civil, Environmental, Architectural Engineering and Mathematics of the University of Brescia (Italy). Here attached please find the abstract of the seminar.
Anyone may directly join online through Google Meet at
Notched micro-cantilever beam fracture (MCF) experiments are increasingly being used to measure fracture toughness of materials at the micro-scale and draw conclusions about size-effects in them. In our recent paper published in Acta Materialia, 'Size effects and failure regimes in notched micro-cantilever beam fracture', we elucidate the failure regimes in MCF experiments and discuss the conditions for validity of MCF tests.
We report phenomenal yield strengths—up to one-fourth of the theoretical strength of silver—recorded in microcompression testing of initially dislocation-free silver micro- and nanocubes synthesized from a multistep seed-growth process. These high strengths and the massive strain bursts that occur upon yield are results of the initially dislocation-free single-crystal structure of the pristine samples that yield through spontaneous nucleation of dislocations.
Dear Colleague:
We are delighted to announce that a Focus Issue entitled "Intrinsic and extrinsic size effects in materials" for the Journal of Materials Research (JMR) is now open for submission:
https://www.cambridge.org/core/journals/journal-of-materials-research/i…
Max Planck Institute of Colloids and Interfaces and Hysitron, Inc. are pleased to present Nanobrücken 2015: A Nanomechanical Testing Workshop & Hysitron User Meeting, which will take place on April 21-23, 2015 in Potsdam, Germany. Nanobrücken 2015 is the fifth edition of the now-annual Nanobrücken workshop series, having been hosted in both Saarbrücken and Dresden.
The Keynote Speaker for this year's workshop will be Prof. Mathias Göken, Universität Erlangen-Nürnberg.
Invited speakers include;
This paper reports the quantitative measurement of a full spectrum of mechanical properties of fivefold twinned silver (Ag) nanowires (NWs), including Young’s modulus, yield strength, and ultimate tensile strength. In-situ tensile testing of Ag NWs with diameters between 34 and 130 nm was carried out inside a scanning electron microscope (SEM). Young’s modulus, yield strength, and ultimate tensile strength all increased as the NW diameter decreased.
In this paper that was published a few months ago, we reported the size effects on the elastic modulus and fracture strength of silicon nanowires. In addition, we observed that the silicon nanowires are linear elastic until fracture with a very large fracture strain up to 12%.
Y. Zhu, F. Xu, Q. Qin, W. Y. Fung, and W. Lu, Nano Letters 9, 3934-3939, 2009
Abstract:
