Biaxial compression -- MD simulation
Using soft sphere, time-driven molecular dynamics (MD) with 1950
particles, the response of the material to biaxial compression
is examined. The vertical right wall feels constant pressure,
while the horizontal top wall is moved down with given strain
(slowly accelerating with time). The other walls (left,bottom)
remain fixed.
The particle contacts are modelled as linear springs with linear damping.
The tangential forces are linear springs which slip when the Coulomb
force is exceeded. Additional (artificial) weak damping is added to
the tangential springs, to the background and to the wall movement.
The following films/pictures are color coded such that small, medium and
large values are blue, green and red, respectively.
Displacement:
kinetic energy mpg1 movie [0.90 MB]
displacement field mpg1 movie [0.70 MB] in the fixed system
kinetic energy mpg1 movie [1.01 MB] in the center of mass system
Potential Energy: Force Chains
potential energy or stress mpg1 movie [0.97 MB] (from normal components only)
force network mpg1 movie [0.90 MB] (from normal components only)
Rotations:
rotational energy energy mpg1 movie [1.10 MB] (momentary)
force network mpg1 movie [1.00 MB] (integrated over time)
lui 05.04.2002