Matt Wesley mwesley@hawaii.edu University of Hawaii at Manoa 7/6/12
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- Slide 1
- Matt Wesley mwesley@hawaii.edu University of Hawaii at Manoa
7/6/12
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- Beginning stages Model setups Results so far Future work
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- Learning to use LS-DYNA Running SMP or MPP shared memory
parallel or massive parallel processing
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- 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
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- Shell elements yield even at low velocities Solid elements hold
up much better
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- 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
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- 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
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- Estimation uses adjusted density of 5893 kg/m 3
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- 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
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- 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!!!
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- 91011121316171819202324252627303112 OSU test setup empty inside
of box correct constraints on column and box compare forces for in
air and in water final report
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- 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