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Contact problems involving beams
Kim, J.H.,Ahn, Y.J.,Jang, Y.H.,Barber, J.R. Pergamon Press ; Elsevier Science Ltd 2014 International journal of solids and structures Vol.51 No.25
Elastic contact problems involving Euler-Bernoulli beams or Kirchhoff plates generally involve concentrated contact forces. Linear elasticity (e.g. finite element) solutions of the same problems show that finite contact regions are actually developed, but these regions have dimensions that are typically of the order of the beam thickness. Thus if beam theory is appropriate for a given structural problem, the local elasticity fields can be explored by asymptotic methods and will have fairly general (problem independent) characteristics. Here we show that the extent of the contact region is a fixed ratio of the beam thickness which is independent of the concentrated load predicted by the beam theory, and that the distribution of contact pressure in this region has a universal form, which is well approximated by a simple algebraic expression.
Frictional energy dissipation in materials containing cracks
Jang, Y.H.,Barber, J.R. Pergamon Press 2011 Journal of the mechanics and physics of solids Vol.59 No.3
Kachanov's simplified model of microcrack interaction is applied to an investigation of the behaviour of a cracked body under predominantly compressive periodic loading, so that the cracks experience periods of closure and slip, with frictional dissipation. The model is shown to be equivalent to a discrete elastic frictional system with each crack representing one node. Theorems and algorithms from such systems are applied to determine the conditions under which the system shakes down to a state with no slip and hence no energy dissipation in friction. For conditions not too far beyond the shakedown state, the dissipation is significantly affected by the initial conditions, but with larger oscillating loads, it becomes a unique and increasing function of load amplitude. The effect of crack interaction is assessed by comparison with an uncoupled model, for which the dissipation is obtained as a summation of closed form expressions over the crack population. For small numbers of cracks, the results are significantly dependent on the randomly chosen crack locations and sizes, but with larger populations, a statistically significant decrease in dissipation is observed with increasing interaction terms.
Custodian-based information sharing
Jacobson, V.,Braynard, R. L.,Diebert, T.,Mahadevan, P.,Mosko, M.,Briggs, N. H.,Barber, S.,Plass, M. F.,Solis, I.,Uzun, E.,Byoung-Joon Lee,Myeong-Wuk Jang,Dojun Byun,Smetters, D. K.,Thornton, J. D. IEEE 2012 IEEE communications magazine Vol.50 No.7
<P>Information sharing systems such as iCloud, Dropbox, Facebook, and Twitter are ubiquitous today, but all of them depend on massive server infrastructure and always-on Internet connectivity. We have designed and implemented a sharing system that does not require infrastructure yet supports robust, distributed, secure sharing by opportunistically using any and all connectivity, local or global, permanent or transient, to communicate. One key element of this system is a new information routing model that so far has proven to be as scalable and efficient as the best of the current Internet routing protocols, while operating in an environment more complex and dynamic than they can tolerate. The new routing model is made possible by new affordances offered by information-centric networking, in particular, the open source CCN [1] release. This article describes the new system and its routing model, and provides some performance measurements.</P>
First particle-by-particle measurement of emittance in the Muon Ionization Cooling Experiment
Adams, D.,Adey, D.,Asfandiyarov, R.,Barber, G.,de Bari, A.,Bayes, R.,Bayliss, V.,Bertoni, R.,Blackmore, V.,Blondel, A.,Boehm, J.,Bogomilov, M.,Bonesini, M.,Booth, C. N.,Bowring, D.,Boyd, S.,Bradshaw, Springer-Verlag 2019 The European physical journal. C, Particles and fi Vol.79 No.3