matt wesley [email protected] university of hawaii at manoa 7/6/12
TRANSCRIPT
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- Matt Wesley [email protected] 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
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- 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