Blog posts
Size effects on elasticity, yielding, and fracture of silver nanowires
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.
Buckling of Aligned Carbon Nanotubes as Stretchable Conductors: A New Manufacturing Strategy
We systematically investigated the interesting electric response of the aligned CNT ribbons under mechanical strain. We found that CNTs slide on a PDMS substrate under tension, but buckle under compression (releasing). Such an irreversible mechanical deformation is responsible for the observed irreversibility in the electric resistance upon the first stretching/releasing.
Postdoctoral Position at Cornell: Modeling the Chemo-Mechanics of Deformation and Fracture via a Concurrent Multiscale Approach
A postdoctoral position is available in the Computational Mechanics and Materials
Group within the School of Civil and Environmental Engineering at Cornell
University (http://ceeserver.cee.cornell.edu/dhw52/index.shtml).
The project will involve the application of ab-initio atomistic modeling
techniques to illuminate the mechanisms by which impurities and environment
influence the mechanical failure of engineering materials.
One PhD Position Available in Mechanics of Materials
One PhD position is available immediately in the Department of Civil & Environmental Engineering at Clarkson University, NY, US. The research program focuses on the mechanical behaviors of advanced materials including polymer microstructures, composites, nanomaterials, and biological materials. Interdisciplinary collaborations are possible. The candidates with background and interest in engineering mechanics, solid mechanics, and materials science are highly encouraged to apply.
Presentations on Rare Metal Required
I was looking for some decent presentations on Rare Metals, and was at a loss in finding some. It would be great if anyone could direct me to anything related to rare metals, especially on presentation form. My email is rummantdm [at] yahoo.com.
Regards
Raihan Rumman
Researcher
Kongju National University, South Korea
Nanoindentation: Oliver & Pharr Analysis
Dear Members,
I am very new to field of nanoindentation and my question might appear too simple.
I am indenting an elastic - plastic material (polymer blend) with spherical indenter. I am well verse with hertz contact mechancis theory and indentation theories like Oliver & Pharr, JKR, DMT and few others.
Scholarship Support for Attending NSF Workshop on the BEM: Bridging Education and Industrial Applications
Sponsored by the National Science Foundation and the NSF Institute for Mathematics and its Applications, the University of Minnesota (Minneapolis, Minnesota, USA) is hosting a workshop on the boundary element method (BEM) April 23-26, 2012. This workshop consists of a two-day short course and a two-day colloquium on advances in the BEM with educational and industrial applications. Researchers and engineers from around the world, as well as students (both graduate and undergraduate) are invited to participate in this workshop.
Profilometer software for NDT surface roughness inspection
Novacam 3D Profilometer Software
The Novacam three dimensional software programs are used with all Novacam Profliometers. The program permits the consumer to define how big the region, or line to be measured, along with the lateral resolution from the measurement.
Novacam's high end Data Acquisition Profilometer Software programs are incorporated with all of MicroCam non-contact profilometers.
Profilometers using Low Coherence Interferometry used by NASA to measures thickness
Using a fiber-based optical profilometer NASA measures the thickness of liquid nitrogen in cryogenic chambers at its Propulsion Systems lab because these profilometers use fiber-based probes which can withstands the extreme environment, can be located hundreds of meters away from the interferometer and fit in the tight chamber which standard full-field profilometers with a human operator could not. The signal quality stays constant over the distance.