Weekly Report Fall 2015 2/2/2015Experiments in the blast lab
consisted of exposing a rat to shockwaves of various amplitudes.
The experiments were conducted with variations in endplate
thickness and number of membranes. Data from the lab for the
different experiments was taken and used to simulate the experiment
in Abaqus. Material properties for the shock tube and the rat head
is shown below:
The rat head model was constrained at the bottom surface, while
the shocktube surfaces were constrained respective to real life
conditions. The shockwave was applied as an amplitude with values
obtained from the actual experiments. The figures are shown
below:
The different variations for the experiment consisted of the
following:MembraneEnd Plate (inches)
122
242
362
424
544
664
Experiment with membranes (2) and endplate (2 in) was
simulated.
Shocktube with shockwave starting to propogate
Shocktube with shockwave passing through the rat head Pressure
profile at an arbitrary node near the rat head for the shock
tube
Pressure distribution on the rat head
Pressure profile on an arbitrary node on the rat head
This simulation took nearly 20 hours to run which is
unacceptable. Modifications have been made in the meshing and
number of data points to reduce the running time, which has been
reduced to 8 hours.
Plan for this week (2/2/2015 2/9/2015): Make similar
modifications in other variations (different membranes, endplate
distance) and reduce simulation time, comparison of results Work on
cantilever beam for strain gauge measurements
Sudeepto Kahali