Material Selection For a Camming Head

1. Material Selection For a Camming Head Project Participants Scott Eaton Diane Maguire Don Bragg Eric Newberg Dan Brooks Jared Record Peter Gilbert Jeremy Ouellette

2. Camming Head Objective • Fill width of crack • Prevent slippage of device when loaded • Hold Fixed Under falling situation Dynamic Load of 13KN

3. Camming Head Function • Maximize Frictional Forces By Optimizing Head Shape • Maximize Working Surface Area • Maximize grip of Head to Rock

4. Constraints For Material Selection • High Fracture toughness • High Strength to weight ratio • Ductile • Formable • Maneuverable

5. Aluminum 6061-T6 • 6000’s Main Components of Magnesium and Silicon • T6 Temper Designation That Solution Is Heat Treated and Artificially Aged

6. Heat Treatment • Magnesium and Silicon are dissolved forming a “Solid-Solution” • Elements fuse to become an alloy.

7. Artificial Aging • Strengthening Mechanism Equivalent to Precipitation Hardening • Precipitate Will form around grain structure leading to fewer slip planes

8. Resulting Aluminum Alloy • Fracture Tough • Strong and light • Ductile • Formable

9. Alternative 7075-T6 • Lower Fracture Toughness • Higher Strength Weight Ratio • Harder Surface-Less Wear

10. Why 6061-T6 Aluminum • Softness Advisable • Experimentally better against slippage • More Ductile less chance of blowout

11. References • http://Web.mit.edu/custer/www/ rocking/cams/cam.html • http://www.matweb.com • http://elvis.engr.wisc.edu/uer/uer96/ author2/content.html • Van Vlack, Lawrence H., Elements of Materials Science and Engineering, fourth edition, Addison-Wesley Publishing, 1980. • Flinn, Richard A. and Trojan, Paul K., Engineering Materials and Their Applications, Houghton Mifflin, Boston, 1975. • DeGarmo, E. Paul, Black, J. Temple and Kohser, Ronald A., Materials and Processes in Manufacturing, Macmillian Publishing, 1988.