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R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA

Investigation of the State of Strain at the Nodal Intersections of Thermoplastic Isogrids using Speckle Image Photogrammetry. R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA Session 10: Applications of Optical Techniques. Agenda. Grids Isogrids

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R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA

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  1. Investigation of the State of Strain at the Nodal Intersections of Thermoplastic Isogrids using Speckle Image Photogrammetry R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA Session 10: Applications of Optical Techniques CompTest 2003

  2. Agenda • Grids Isogrids • Advantages of Thermoplastics • Prototype Isogrid Project • Manufacturing • Experimental Evaluation • Results and Conclusions CompTest 2003

  3. Advantages of Grid Structures • Highly Efficient • Damage Tolerant • Redistribution around damage • Take Advantage of the Anisotropy of Composites • Potential in Composites for Fabrication Automation CompTest 2003

  4. Grid Types • Quadri-Directional • Tri-Directional • Orthogrid • Anglegrid CompTest 2003

  5. History of Isogrids • British Vickers Wellington Bomber • McDonnell Douglas (1960) • Payload Fairings, Edwards AFB (mid 80s) • Aerospace Applications CompTest 2003

  6. Thermoplastics Provide Significant Advantages • In Situ Processing • Effective Repair • Recycling CompTest 2003

  7. Prototype Study • Manufacture Isogrid • Test Analogs • Optimization of Isogrid Configuration • Manufacturing Automation CompTest 2003

  8. Isogrid Mold CompTest 2003

  9. Isogrid Lay-Up Pattern CompTest 2003

  10. Experimental Evaluation • Compare Composites to Aluminum and Steel • Develop Understanding of Impact of Lay-Up Pattern • Experimental Methods • 3 Point Bend CompTest 2003

  11. Prototype Isogrid CompTest 2003

  12. Speckle ImagePhotogrammetry CompTest 2003

  13. Analog Results CompTest 2003

  14. Performance Summary Flexural Rigidity D=Et3/[12(1-2)] CompTest 2003

  15. Full Field Results CompTest 2003

  16. Grid Comparisons CompTest 2003

  17. Next Steps CompTest 2003

  18. Summary • Thermoplastic Isogrids have Unique capabilities • Composite Isogrid Outperforms Al and Steel Isogrid • Speckle Image Photogrammetry verifies effectiveness of node strategy • Future Work Includes Analysis and Manufacturing Automation CompTest 2003

  19. Acknowledgements and QUESTIONS? • Students • Rebecca Terry, Matt Bamford, Paula Denemma, Jenny Moon, Matt Hilbert • Orgaizations • National Science Foundation • Automated Dynamics Corp. • NASA CompTest 2003

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