Matt Wesley University of Hawaii at Manoa 7/6/12

Beginning stages Model setups Results so far Future work

Learning to use LS-DYNA Running SMP or MPP shared memory parallel or massive parallel processing

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

Shell elements yield even at low velocities Solid elements hold up much better

Material: PLASTIC_KINEMATIC E=3.2 GPa ρ=1200 kg/m 3 ν=0.37 Dimensions: Base: modeled as solid elements, thickness of m Base also has a lip, this is where the contact will be made Top: modeled as shell elements, thickness of m

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

Estimation uses adjusted density of 5893 kg/m 3

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

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!!!

OSU test setup empty inside of box correct constraints on column and box compare forces for in air and in water final report

Starting out with LS-DYNA Results so far Future work and problems

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 Pages LS-DYNA Theory Manual