SAND SAMPLING APPARATUS Eglin Air Force Base Gina Teofilak Richard Klimas Dan Mortensen Ruben De Sousa

William “Bill” Cooper, MSgt Wes Schuler, LT Brad Breaux, Lalit Chhabildas AFRL/RW Munitions Directorate Air Force Research Laboratory Phil Metzger Granular Mechanics & Surface Systems Lab NASA, Kennedy Space Center Victor Giurgiutiu Air Force Office of Scientific Research Sand Fracture Mechanisms During High-Speed Sand Impacts 2

Overview- The Experiment 3  Target filled with 3000 lbs. sand  Projectile shot through the target  Documentation of virgin & impacted sand grain morphology

Introduction INTRODUCTION 4 Fractured sand Projectile Target shot line

E GLIN V ISIT 10/31/2008 Current Design 5

6 Fabrication Squared base constructed from 4”x4” wood to mount rails of the apparatus (temporary) Carefully Mounted to reduce binding of actuators

7 Actuators mounted to rails with little to no binding upon completion Mounting plates fabricated for actuators Chain mounted Testing with drill ensured smooth motion Fabrication

T ES T 1 Feature TestedMethodResult Portability FitPlacing the mechanism on the target * BindingMoving the mechanism manually and with a hand drill Vacuum tipManually simulating the motion Customer SatisfactionInterviewing the sponsor and technicians UsefulnessCompared to previous method * It is important to build a metallic frame for correct placement and alignment Test- 1 8

Pros -Allows play -Less Friction against the rod Cons -Bigger, heavier -More moving parts -More friction away from the rod Solution for Binding 9

10 Framing Metal Frame used to reduce binding Frame provided by sponsor

11 Electronics- Method Wall SocketPower SupplyMicroprocessor Switches Motor ControllerMotor Motor Controller Motor X Direction Movement Z Direction Movement Y Direction Movement  Use of switches and hard coding to get motion control desired.  Cheapest method to get desired motion.  More labor intensive.  Upgradeable to a more user friendly system of position control.

12 Electronics- Progress  Electronics have been received.  Integrating the electronics to the mechanism almost complete.  Cabling ran close to the mechanism in twisted pairs and attached away from moving parts.  Electronics are being enclosed in a plastic enclosure for protection from the environments.

Electronics- Progress  Programming of BASIC Stamp has begun.  Stamp Editor similar to MatLab.  Open Loop and Closed Loop Programs used for desired movements 13

Things to come  Final Framing  Further testing  Motors  Programming  Operations Manual  Usage  Setup and breakdown  Replacement of parts  Programming  Electrical diagrams  Specalog 14