Modeling/defining Loop of blocks of different load amplitude
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Dear all
In the experiment setup, the fatigue loading spectrum has a loop of 2 blocks of load amplitude. First load amplitude the higher applied for 2X time period followed by lower load amplitude for X time period then the loop repeated till failure. the load sequence was High-Low and Low-High in this loop. X was in thousands so might be suggested as the cyclic response will be stabilized in the first 10 cycles, the first block will dominate the fatigue behaviour at least till fracture, or damage initiation.
Topology optimization of magnetic source distributions for diamagnetic and superconducting levitation
Topology optimization is used to obtain a magnetic source distribution providing levitation of a diamagnetic body or type I superconductor with maximized thrust force. We show that this technique identifies non-trivial source distributions and may be useful to design devices based on non-contact magnetic suspension and other magnetic devices, such as micro-magneto-mechanical devices, high field magnets etc.
a "contact sport" between academics
Recently, there was a big competition announced for rough elastic adhesive contact --- by Martin Muser as organizer. This was published in Tribology Letter, involved the effort of many groups in the world, and finally got even a commentary in Science by Rob Carpick.
A recent PNAS paper explained! FRACTURE MECHANICS SIMPLE CALCULATIONS TO EXPLAIN SMALL REDUCTION OF THE REAL CONTACT AREA UNDER SHEAR
If you have seen the very nice PNAS paper which just appeared
Sahli, R., Pallares, G., Ducottet, C., Ben Ali, I.E., Al Akhrass, S., Guibert, M., Scheibert, J., 2018, Evolution of real contact area under shear, Proceedings of the National Academy of Sciences, 115(3), pp. 471-476.
Here we provide a simple explanation.
FACTA UNIVERSITATIS
Series: Mechanical Engineering
DOI: 10.22190/FUME180108007C
Short Communication
FRACTURE MECHANICS SIMPLE CALCULATIONS TO EXPLAIN SMALL REDUCTION OF THE REAL CONTACT AREA UNDER SHEAR
UDC 539.6
18-month post-doctorate position at SRMP, CEA/Saclay, France, starting from April 2018
Title of the project: Ab initio modelling of interactions between dislocations and solutes in body-centered cubic metals
Research area: Solid State Physics, Materials Science
Summary of the project:
a quite critical comment of a recent set of fretting fatigue experiments
Effect of out-of-phase loading on fretting fatigue response of Al7075-T6 under cyclic normal loading using a new testing apparatu
Non-local plasticity effects on notch fracture mechanics (code included)
I hope some of you find this work interesting, the code with the control algorithm (Segurado and Llorca, 2004) to avoid convergence problems in cohesive zone model analyses of crack propagation can be downloaded from empaneda.com/codes (documentation and Abaqus input files are provided).
Non-local plasticity effects on notch fracture mechanics
Emilio Martínez-Pañeda, Susana del Busto, Covadonga Betegón
Theoretical and Applied Fracture Mechanics (2017)
brake squeal
An interesting commercial/scientific paper
Soft network materials with isotropic negative Poisson's ratios over large strains
Auxetic materials with negative Poisson's ratios have important applications across a broad range of engineering areas, such as biomedical devices, aerospace engineering and automotive engineering. A variety of design strategies have been developed to achieve artificial auxetic materials with controllable responses in the Poisson's ratio. The development of designs that can offer isotropic negative Poisson's ratios over large strains can open up new opportunities in emerging biomedical applications, which, however, remains a challenge.