Beginning stages Model setups Results so far Future work
Slide 3
Learning to use LS-DYNA Running SMP or MPP shared memory
parallel or massive parallel processing
Slide 4
Need an accurate model to test in air and in water 1:5 scale of
a 20ft shipping container Made from acrylic 48 in Side view 48.5 in
20.4 in
Slide 5
Shell elements yield even at low velocities Solid elements hold
up much better
Slide 6
Material: PLASTIC_KINEMATIC E=3.2 GPa =1200 kg/m 3 =0.37
Dimensions: Base: modeled as solid elements, thickness of 0.024 m
Base also has a lip, this is where the contact will be made Top:
modeled as shell elements, thickness of 0.012 m
Slide 7
First, created a wall with the same width as the box Used rigid
material Set it to be stationary Next, created a load cell Used the
same rigid material and made it stationary Varied the speed at
which the box impacted
Slide 8
Slide 9
Estimation uses adjusted density of 5893 kg/m 3
Slide 10
Viscous flow with an initial velocity BIG!!! Need to add a
column with a load cell and the acrylic box model Just using basic
properties for now until the model works
Slide 11
Need to void the interior of the box
*INITIAL_VOLUME_FRACTION_GEOMETRY What is the best ratio of ALE
nodes per Lagrangian node Long run times!!!
Slide 12
91011121316171819202324252627303112 OSU test setup empty inside
of box correct constraints on column and box compare forces for in
air and in water final report
Slide 13
Starting out with LS-DYNA Results so far Future work and
problems
Slide 14
Paczkowski, K. Riggs, H.R. Naito, C.J. Lehmann, A. A
one-dimensional model for impact forces resulting from high mass,
low velocity debris. Structural Engineering and Mechanics. Vol. 42.
No. 6. 2012. Pages 831-847.
http://www.encyclopedia2.thefreedictionary.com/MPP LS-DYNA Theory
Manual
