1. Ae105c PDR, May 7, 2008 p. 1 Ae105c Term Project PDR Team report from Experimental Team Jason Cerundolo Vivek Viswanathan Pelayo Bohorquez

2. Ae105c PDR, May 7, 2008 p. 2 Task Overview Design and set up experiments Collect, process, and publish data Focus on o Geometry and mass measurements o Material properties measurements o Static tests o Dynamic tests o Thermal tests

3. Ae105c PDR, May 7, 2008 p. 3 Assumptions All tests must be non destructive Longerons and battens are made of the same material Impossible to test longeron material properties Battens Cross section – rounded rectangle Always in compression Diagonals Cross section - circle Always in tension

4. Ae105c PDR, May 7, 2008 p. 4 4 Baseline Approach Perform tests to determine material properties as well as static, dynamic, and thermal responses Measure geometry with rulers, calibers, etc and mass with a scale Collect stress-strain data on boom elements Strap canister horizontally and firmly to create fixed boundary condition Use laser displacement sensors, force shaker, and thermal lamps Process data into engineering units (length, time, etc) and publish to wiki for use by other teams

5. Ae105c PDR, May 7, 2008 p. 5 5 Technical Status Mass and geometry measurements complete Material property measurements complete Mount for static condition complete o redone with ratchet tightener Static force-displacement test complete Concerned boundary condition might not be stiff enough for dynamic testing Data, results, and pictures are posted on the wiki

6. Ae105c PDR, May 7, 2008 p. 6 Material Property Experiments Diagonal Tension Test Batten Compression Test Batten Tension Test

7. Ae105c PDR, May 7, 2008 p. 7 Material Property Measurements Diagonals: cylindrical cross section Battens: rounded rectangle cross section PropertyValue [Units]Method Length24.9 cmRuler Diameter1.25 mmCalibers Mass1.2 gScale Young’s Modulus48.97 GPaTensile Test PropertyValue [Units]Method Length (uncompressed)18.1 cmRuler Width2.87 mmCalibers Depth3.77 mmCalibers Mass (batten unit)14.2 gScale Young’s ModulusTDBTensile Test

8. Ae105c PDR, May 7, 2008 p. 8 Static Test Setup 4 Laser displacement sensors DAQ unit collects data at 100 Hz Weights added to the tip Fixed boundary condition created with two tie-down straps Tip

9. Ae105c PDR, May 7, 2008 p. 9 Static Test Results Time Displacement Time Tip Canister Root Middle Tip Middle Canister Root Canister Root Middle Tip

10. Ae105c PDR, May 7, 2008 p. 10 Conclusions Creep exists as evident in static test results – Likely due to joint creep, especially in the boom-canister interface Further investigation is required to determine quality of boundary condition

11. Ae105c PDR, May 7, 2008 p. 11 Dynamic Test The dynamic tests will measure the boom’s response to a known input A shaker will be mounted beneath the boom to displace it vertically Laser displacement measurement units will measure the vertical displacement from above

12. Ae105c PDR, May 7, 2008 p. 12 Interfaces X TeamSys IDStructuralDynamics X Team -Raw data -Experimental parameters -Mass and geometry -Material Properties System ID -Experiments to run Structural -Experiments to run Dynamics From To

13. Ae105c PDR, May 7, 2008 p. 13 13 Open Issues and Concerns Canister mount is imperfect o May not be adequate for dynamic testing o Ideally would be able to bolt pipes into floor o How much separation is required in frequency space? Performing comprehensive thermal testing with four weeks is aggressive. Thermal test configuration requires better definition

14. Ae105c PDR, May 7, 2008 p. 14 Summary Mass, geometry, material properties determined Static test complete Dynamic test preparations underway Thermal tests will be completed schedule permitting Experimental set up issues, which have previously delayed progress, have been addressed Experiments now running smoothly

15. Ae105c PDR, May 7, 2008 p. 15 Back-up Material

16. Ae105c PDR, May 7, 2008 p. 16 Endplate and connections Miscellaneous Measurements ObjectMass [g] End plate362.8 Bracket4.6 Back plate1.0 Bolt and washer4.7

17. Ae105c PDR, May 7, 2008 p. 17 Canister Mount Mk1

18. Ae105c PDR, May 7, 2008 p. 18 Canister Mount Mk2