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30 January 2003 Châlons en Champague CompTest 2003 Investigation of the State of Strain at the Nodal Intersections of Thermoplastic Isogrids using Speckle.

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Presentation on theme: "30 January 2003 Châlons en Champague CompTest 2003 Investigation of the State of Strain at the Nodal Intersections of Thermoplastic Isogrids using Speckle."— Presentation transcript:

1 30 January 2003 Châlons en Champague CompTest 2003 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

2 30 January 2003 Châlons en Champague CompTest 2003 Agenda Grids Isogrids Advantages of Thermoplastics Prototype Isogrid Project –Manufacturing –Experimental Evaluation Results and Conclusions

3 30 January 2003 Châlons 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

4 30 January 2003 Châlons en Champague CompTest 2003 Grid Types Quadri-Directional Tri-Directional Orthogrid Anglegrid

5 30 January 2003 Châlons en Champague CompTest 2003 History of Isogrids British Vickers Wellington Bomber McDonnell Douglas (1960) Payload Fairings, Edwards AFB (mid 80s) Aerospace Applications

6 30 January 2003 Châlons en Champague CompTest 2003 Thermoplastics Provide Significant Advantages In Situ Processing Effective Repair Recycling

7 30 January 2003 Châlons en Champague CompTest 2003 Prototype Study Manufacture Isogrid Test Analogs Optimization of Isogrid Configuration Manufacturing Automation

8 30 January 2003 Châlons en Champague CompTest 2003 Isogrid Mold

9 30 January 2003 Châlons en Champague CompTest 2003 Isogrid Lay-Up Pattern

10 30 January 2003 Châlons 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

11 30 January 2003 Châlons en Champague CompTest 2003 Prototype Isogrid

12 30 January 2003 Châlons en Champague CompTest 2003 Speckle Image Photogrammetry

13 30 January 2003 Châlons en Champague CompTest 2003 Analog Results

14 30 January 2003 Châlons en Champague CompTest 2003 Performance Summary Gl/Ny isogrid AL isogrid ST isogrid Al solid St solid Mass (g)200023916712433612078 Slope (MN/m)5.0135.53813.437.58924.59 Mass Ratio11.1963.3562.1686.039 Stiffness Multiplication 11.7137.510.2220 Flexural Rigidity D=Et 3 /[12(1- 2 )]

15 30 January 2003 Châlons en Champague CompTest 2003 Full Field Results

16 30 January 2003 Châlons en Champague CompTest 2003 Grid Comparisons

17 30 January 2003 Châlons en Champague CompTest 2003 Next Steps

18 30 January 2003 Châlons 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

19 30 January 2003 Châlons 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


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