R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA
description
Transcript of R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA
![Page 1: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/1.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Investigation of the State of Strain at the Nodal Intersections of
Thermoplastic Isogrids using Speckle Image Photogrammetry
R.B. BucinellUnion College Mechanical Engineering
Schenectady, NY, USA
Session 10: Applications of Optical Techniques
![Page 2: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/2.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Agenda
• Grids Isogrids • Advantages of Thermoplastics• Prototype Isogrid Project–Manufacturing– Experimental Evaluation
• Results and Conclusions
![Page 3: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/3.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Advantages of Grid Structures
• Highly Efficient• Damage Tolerant– Redistribution around damage
• Take Advantage of the Anisotropy of Composites
• Potential in Composites for Fabrication Automation
![Page 4: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/4.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Grid Types
• Quadri-Directional
• Tri-Directional
• Orthogrid
• Anglegrid
![Page 5: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/5.jpg)
30 January 2003Châlons en Champague
CompTest 2003
History of Isogrids
• British Vickers Wellington Bomber
• McDonnell Douglas (1960)
• Payload Fairings, Edwards AFB (mid 80s)
• Aerospace Applications
![Page 6: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/6.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Thermoplastics Provide Significant Advantages
• In Situ Processing
• Effective Repair
• Recycling
![Page 7: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/7.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Prototype Study
• Manufacture Isogrid
• Test Analogs
• Optimization of Isogrid Configuration
• Manufacturing Automation
![Page 8: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/8.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Isogrid Mold
![Page 9: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/9.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Isogrid Lay-Up Pattern
![Page 10: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/10.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Experimental Evaluation
• Compare Composites to Aluminum and Steel
• Develop Understanding of Impact of Lay-Up Pattern
• Experimental Methods– 3 Point Bend
![Page 11: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/11.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Prototype Isogrid
![Page 12: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/12.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Speckle ImagePhotogrammetry
![Page 13: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/13.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Analog Results
![Page 14: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/14.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Performance SummaryGl/Ny
isogridAL
isogridST
isogridAl
solidSt
solid
Mass (g) 2000 2391 6712 4336 12078
Slope (MN/m) 5.013 5.538 13.43 7.589 24.59
Mass Ratio 1 1.196 3.356 2.168 6.039
Stiffness Multiplication 1 1.71 37.5 10.2 220
Flexural Rigidity D=Et3/[12(1-2)]
![Page 15: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/15.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Full Field Results
![Page 16: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/16.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Grid Comparisons
![Page 17: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/17.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Next Steps
![Page 18: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/18.jpg)
30 January 2003Châlons en Champague
CompTest 2003
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
![Page 19: R.B. Bucinell Union College Mechanical Engineering Schenectady, NY, USA](https://reader035.fdocuments.us/reader035/viewer/2022070502/5681429a550346895daed269/html5/thumbnails/19.jpg)
30 January 2003Châlons en Champague
CompTest 2003
Acknowledgements and QUESTIONS?
• Students– Rebecca Terry, Matt Bamford, Paula
Denemma, Jenny Moon, Matt Hilbert• Orgaizations
– National Science Foundation– Automated Dynamics Corp.– NASA