Flexible Self Locking Pin-less Joint

Lance Woolley

Ben Henrie

Compliant Chair

Complex Geometry

Original Design Modified Design

Required Information

• Required Information• 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

Simplified Model

• Plane of Symmetry

• 2-D Plane

• Constraints• Horizontal Pin-Slider• Vertical Rollers

• Loads• Fx = 723 N

• Fy = -123 N

Free Mesh for Original Design

Free Mesh at 0.20 Free Mesh at 0.15

Deformed Shape for Original Design

Stress with 0.20 Mesh for Original Design

Stress with 0.15 Mesh for Original Design

Free Mesh for Modified Design

Mesh at 0.15 Mesh at 0.30

Deformed Shape for Modified Design

Stress for Modified Design

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