The indentation behavior of cold-rolled AA6061 Al alloy was investigated. Following the approach suggested by Tabor, indentation stress-indentation strain curves were constructed and analyzed. The indentation stress required to create the same indentation strain increases with an increase in the reduction of thickness, suggesting a strong effect of plastic deformation history on the deformation behavior of materials. Through the dislocation dynamics, the evolution of the dislocations underneath the indentation was correlated with the plastic deformation history and the indentation load. The plastic energy dissipated in indentation was then calculated and found to be proportional to the 3/2 power of the indentation load and the 3/4 power of the average dislocation density underneath the indentation. The ratio of the dissipated plastic energy to the total energy in the indentation was demonstrated to be a function of the deformation state in materials, independent of the indentation load.
|Number of pages||8|
|Journal||Journal of Materials Research|
|State||Published - May 2005|
Bibliographical noteFunding Information:
This research is supported by the National Science Foundation through Grant No. DMR-0211706 monitored by Dr. Guebre Tessema and Dr. Bruce A. MacDonald and the Kentucky Science and Engineering Foundation through Grant No. KSEF-148-502-03-73.
ASJC Scopus subject areas
- Materials Science (all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering