Hostname: page-component-848d4c4894-hfldf Total loading time: 0 Render date: 2024-05-12T22:16:28.785Z Has data issue: false hasContentIssue false

Viscoelastic Behavior of Polymer Films During Scratch Test: a Quantitative Analysis

Published online by Cambridge University Press:  10 February 2011

Vincent D. Jardret
Affiliation:
MTS Nano Instruments Innovation Center, 1001 Larson Drive, TN 37830, vincent.jardret@mts.com
Warren C. Oliver
Affiliation:
MTS Nano Instruments Innovation Center, 1001 Larson Drive, TN 37830, vincent.jardret@mts.com
Get access

Abstract

Dynamic properties of polymer surfaces affect their ability to withstand abrasive actions. Kinetic conditions, like velocity, penetration depth and shape of the abrasive particles, change the abrasion mechanisms and the morphology of the abraded surface. Using the scratch technique, along with profilometry measurement across the scratches, we have been able to completely characterize the residual scratch morphology. Pile-up deformation and visco-plastic relaxation are key phenomena that characterize the importance of ductility in the scratch resistance of polymer surfaces. Cross profilometry aids in studying the relaxation of the scratch morphology for different time and temperature history after the scratch is made. The effect of scratch velocity, penetration depth and indenter geometry on the contact pressure and friction coefficient estimated during a scratch test can also be analyzed. Following Eyring's law, a good correlation, was found between normal indentation and scratch testing in the evolution of the contact pressure with the applied strain rate. This work results in a better understanding of the stresses and the strains applied by an abrasive particle, and especially relates the dynamic mechanical properties of viscous materials, like stress exponent, to their scratch behavior. The method presented can provide for the measurement of dynamic properties of polymer surfaces or thin films under a very large range of strain rates.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Briscoe, B.J., Evans, P.D., Pelillo, E. and Sinha, S.K., Wear, 200, (1996) 137147, “Scratching maps for polymers”.Google Scholar
2. Jardret, V., Oliver, W.C., Ramamurthy, A.C., to be published in Journal of Coating Technology.Google Scholar
3. Jardret, V., Oliver, W.C., in Thin Films: Stresses and Mechanical Properties, (Mater. Res. Soc. Proc. 594, Boston, MA, 1999).Google Scholar
4. Jardret, V., Wear, vol.202, 98.Google Scholar
5. Lucas, B. N., Ph. D. Dissertation, The University of Tennessee, Knoxville, 1997.Google Scholar