Sand Sampling Apparatus Gina Teofilak Richard Klimas Dan Mortensen Ruben De Sousa

Sponsor Eglin Air Force Base Dr. William Cooper Munitions Directorate Air Force Research Laboratory Faculty Advisor Dr. Ongi Englander Faculty Collaborations Dr. Jonathan Clark Mechanical Engineering Dr. Patrick Hollis Mechanical Engineering

Overview Introduction Experiment background information Design Concept- take one Experimental Changes Design Concept- take two Current Design Modeling Cost Analysis Comparisons

Introduction Purpose Problem introduction x z 8’ x 2’ x 2’ target 1100lbs sand Interest in crystalline structure of particles and grain morphology Shot line approximately 1’ under compacted sand Manual labor to fill and excavate Scooping technique (shovel and Ziploc bag) Disruptions to sand of interest Poor accuracy for researchers 4

Experimental background Projectile Particle Analysis Experimental background Virgin Fractured v= 1200m/s = 3937 ft/s 25.4 mm (1.00 in) diameter, L/D=7 Vimpact= 577 m/s (1,890 ft/s) Virgin sand is dark in color Fractured sand changes color and density ρ = 1.58g/cc, not packed ρ = 1.73g/cc, packed 5

Design Concept- take one Breakdown Design take one Mount Aluminum Extrusion to side of target Vacuum to desired depth Use of Linear Actuators Carbon Stick Tape 6

Newly added forklift straddles Experimental Changes Eglin Visit 10/31/2008 Newly added forklift straddles 7

Design Concept – Take two Breakdown Mechanism must be attached to top of target Vacuum to desired depth Linear actuators will be designed Carbon tape in circles Cylinder to attach carbon tape Disadvantages Threaded rod lead screws were found to bend X y z 8

Current Design Current Design Use 2 linear motion actuators for Y and Z motion ¾ inch threaded rod aluminum extrusion frames ¾ inch aluminum rod stabilizers for support motion to be attained from 2 high torque dc motors Mounts to the side walls of the box for easy installation X y z 9

Motion in the X-direction Current Design Chain and sprocket motion Wheels fit inside aluminum extrusion grooves DC motor attached to sprocket Chain is clamped to actuator Chain mount is adjustable for chain tension 10

Motion Control Current Design Motion control 3 DC motors/drivers micro processor encoders Y axis motion threaded rod aluminum rod for support Z axis motion threaded rod rigidly attached to vacuum tube Control Sequence z axis ½”-1” y axis 24” x axis 4” X y z 11

Tip down Inverted tip modeling Surface result Surface result 12

Tip Design modeling Controlled depth Blades to breakup material Back pins Trial and error Side View Bottom View Front View 13

Cost Analysis Comparisons Cost Breakdown Total: $3627.20 Total: $1053.71 Total: $1,150 14

REFERENCES Cost References Cooper, William “Bill”, MSgt Wes Schuler, AFRL/RW Munitions Directorate Air Force Research Laboratory Mortensen, Charles, Owner, Dynatech Associates Dr. Chiang Shih, FAMU-FSU College of Engineering, Mechanical Dr. Daudi Waryoba, FAMU-FSU College of Engineering, Mechanical Cost References Carbon Stick tape http://www.2spi.com/catalog/spec_prep/cond_adhes-discs.shtml Aluminum Extrusion Dynatech Associates McMASTER-CARR http://www.mcmaster.com/ 15