106 research outputs found
Effect of Uncertainty in Processing Parameters on the Microstructure of Single Melt Tracks Formed by Selective Laser Melting
Depinning Transition of a Two Dimensional Vortex Lattice in a Commensurate Periodic Potential
We use Monte Carlo simulations of the 2D one component Coulomb gas on a
triangular lattice, to study the depinning transition of a 2D vortex lattice in
a commensurate periodic potential. A detailed finite size scaling analysis
indicates this transition to be first order. No significant changes in behavior
were found as vortex density was varied over a wide range.Comment: 5 pages, 8 figures. Revised discussion of correlation length exponent
using a more accurate finite size scaling analysis. New figs. 5 and 6. Old
figs. 6 and 7 now figs. 7 and
Modelling the Effect of Non-Uniform Fibre Distribution on the Curing Behaviour in Resin Injection Pultrusion
Flux lattice melting and depinning in the weakly frustrated 2D XY model
Monte Carlo simulations of the frustrated 2D XY model were carried out at
small commensurate values of the frustration . For a single
transition was observed at which phase coherence (finite helicity modulus) and
vortex lattice orientational order vanish together. For a new phase in
which phase coherence is absent but orientational order persists was observed.
Where comparison is possible, the results are in detailed agreement with the
behavior of the lattice Coulomb gas model of vortices. It is argued that the
helicity modulus of the frustrated 2D XY model vanishes for any finite
temperature in the limit of weak frustration .Comment: 4 pages, RevTeX, 3 figures in separate uuencoded file The manuscript
will appear in Phys. Rev.
Fluctuation induced vortex pattern and its disordering in the fully frustrated XY model on a dice lattice
A highly degenerate family of states [proposed in PRB 63, 134503 (2001)] is
proven to really minimize the Hamiltonian of the fully frustrated XY model on a
dice lattice. The harmonic fluctuations are shown to be no consequence for the
removal of the accidental degeneracy of these states, so a particular vortex
pattern can be stabilized only by the anharmonic fluctuations. The structure of
this pattern is found and the temperature of its disordering due to the
proliferation of domain walls is estimated. The extreme smallness of the
fluctuations induced free energy of domain walls leads to the anomalous
prominence of the finite-size effects, which prevent the observation of
vortex-pattern ordering in numerical simulations. In such a situation the loss
of phase coherence may be related to the dissociation of fractional vortices
with topological charges 1/8. In a physical situation the magnetic interaction
of currents in a Josephson junction array will be a more important source for
the stabilization of a particular vortex pattern than the anharmonic
fluctuations.Comment: 20 pages, 7 figure
The effect of saturation on resin flow in injection pultrusion: a preliminary numerical study
Multi-Scale Multiphysics Simulation of Metal L-PBF AM Process and Subsequent Mechanical Analysis
Simulation of resin-impregnation, heat-transfer and cure in a resin-injection pultrusion process
Transverse depinning and melting of a moving vortex lattice in driven periodic Josephson junction arrays
We study the effect of thermal fluctuations in a vortex lattice driven in the
periodic pinning of a Josephson junction array. The phase diagram current ()
vs. temperature () is studied. Above the critical current we find a
moving vortex lattice (MVL) with anisotropic Bragg peaks. For large currents
, there is a melting transition of the MVL at . When
applying a small transverse current to the MVL, there is no dissipation at low
. We find an onset of transverse vortex motion at a transverse depinning
temperature .Comment: 4 pages, 4 figures, Figure 2 changed, added new reference
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