1. Flexible Self Locking Pin-less Joint
Lance Woolley
Ben Henrie

2. Compliant Chair

3. Complex Geometry
Original Design
Modified Design

4. Required Information Required Information Required Modeling
Compressive stress upper compliant member
Tensile stress
lower compliant member
Required Modeling
Mesh size
0.15 – 0.3 cm
Mesh technique
Mapped
Free
Target surface

5. Simplified Model Plane of Symmetry 2-D Plane Constraints Loads
Horizontal Pin-Slider
Vertical Rollers
Loads
Fx = 723 N
Fy = -123 N

6. Free Mesh for Original Design
Free Mesh at 0.20
Free Mesh at 0.15

7. Deformed Shape for Original Design

8. Stress with 0.20 Mesh for Original Design

9. Stress with 0.15 Mesh for Original Design

10. Free Mesh for Modified Design
Mesh at 0.15
Mesh at 0.30

11. Deformed Shape for Modified Design

12. Stress for Modified Design

13. Conclusion FEA showed were the stresses would be present
Model was simplified by a factor of eight
Mesh size plays an important roll in an accurate models
Both designs need to be modeled non-linearly