XYZ Adhesion Testing 1

Test Setup

• 3-axis XYZ stage.
• Control loop at 1kHz embedded on Microchip PIC18F4431?
• Control done using trajectory files with waypoints and linear interpolation
• Sampling force plate at 1kHz.
  • Data filtered at 10 Hz using 3rd order Butterworth filter
• Sampling position data at 500Hz

Experiment #1

Procedure

• Preload along 45 degree approach angle to a specified depth in Z (between 0 to 1000um)
• Pulloff at specified angle defined by:
  • +Z is the contact normal, +Y is aligned with the "direction of curvature" of the samples, +X to enforce right-handedness
  • Begin with vector, V, aligned along +Y-axis
  • Rotate V about +Z-axis by angle Theta, between 0 and 180 degrees in 15 degree increments
  • Rotate V about +Y-axis by angle Phi, between 0 and 180 degrees in 15 degree increments
  • Pull-off along vector V
• Pulloff measured by finding maximum value of V-dot-F in sampled force data

Materials

• Sample - Directional Adhesive Pad, "Long"-type, #1A
• Substrate - Glass

Results for Sample 1A

• Pulloff in YZ-plane - similar to previous data for 2-axis stage)

• Pulloff in XZ-plane - effects of side loading on adhesion strength

• Video of 3D Limit Surface for all Pulloff forces measured at 600um
  • ForceData3DIndeo5.avi: Compression using Matlab "Indeo5"
  • ForceData3DCinepak.avi: Compression using Matlab "Cinepak" (seems to work w/ QuickTime)

• Presentation Summary of Data:
  • LabPresentation_10_26_2006.ppt