Modeling and Simulation of Nanoindentation into Polymer Thin Films by Finite Element Method

Authors

  • Srinivasa Rao Ch Department of Mechanical Engineering, PVP Siddhartha Institute of Technology, Kanuru, Vijayawada, 520007, A.P .INDIA
  • Eswara Reddy C Department of Mechanical Engineering, College of Engineering, Sri Venkateswara University, Tirupati, 517502 A.P. INDIA.

Keywords:

UHMWPE, PMMA, Loading/unloading characteristic, Nanoindentation, FEM,

Abstract

Nanoindentation technique is being widely used to measure the hardness and elastic modulus of thin film coatings.  It is being used extensively to measure the nanomechanical properties of hard thin films. However, the determination of the surface mechanical properties of polymeric materials with such techniques is relatively new. In this paper, an attempt has been made to simulate the nanoindentation process into polymer thin films by Finite Element Modeling (FEM) Technique.  FEM has been done to extract both elastic and visco elastic properties of polymeric thin films. The experimental values of elastic moduli available from the literature for bulk Polymethyl Methacrylate (PMMA) and ultra-high molecular weight polyethylene (UHMWPE) are used to simulate the nanoindentaion into their thin films.  In linear elasticity case, the load-displacement data   obtained by simulation is used to calculate the Young’s modulus and hardness of the thin films and it is found that the thin films are superior in surface hardness than to bulk materials. The Stress and Strain calculation with plastic deformation of the thin film was simulated by FEM. The model is extended to measure time-dependent behavior (Visco elastic) of polymeric films. In Visco elastic case, the load-displacement data is obtained as a function of time and is compared with that of the analytical results. A good correlation is found between the simulated results and analytical results. The obtained load-displacement data is used to calculate visco elastic properties of polymer thin films i.e., the relaxed shear modulus and Creep compliance. The thin films properties are measured with no substrate influence, and considering the indentation experiments made with in the thumb rule of 10% of the film thickness.

Downloads

Download data is not yet available.

References

W. C. Oliver and G. M. Pharr. An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments, J. Mater. Res. 7, 1564 (1992)

McElhaney, K.W., Vlassak, J.J., Nix, W.D., ‘Determination of indenter tip geometry and indentation contact area for depth-sensing indentation experiments.’ Jl. Mater. Res. 13, 1300–1306, (1998)

A.E. Giannakopoulos and S. Suresh, ‘Determination of Elastoplastic Properties by Instrumented Sharp Indentation’, Scripta Materialia, Vol. 40, pp. 1191-1198, (1999)

Strojny, A., and Gerberich, W. W., ‘‘Experimental Analysis of Viscoelastic Behavior in Nanoindentation,’’ Fundamentals of Nanoindentation and Nanotribology, N. R. Moody, W. W. Gerberich, N. Burnham, and S. P. Baker, eds., Mater. Res. Soc. Symp. Proc., 522, pp. 159–164, (1998)

Cheng, L., Scriven, L. E., and Gerberich, W. W, ‘‘Viscoelastic Analysis of Micro- and Nanoindentation,’’ Fundamentals of Nanoindentation and Nanotribology, N. R. Moody, W. W. Gerberich, N. Burnham, and S. P. Baker, eds., Mater. Res. Soc. Symp. Proc., 522, pp. 193–198, (1998).

M.V. Ramesh Kumar and R. Narasimhan, Analysis of spherical indentation of linear viscoelastic materials, current science, vol. 87, no. 8, 25, 1088-1095, october, (2004)

C.Y. Zhang and Y.W. Zhang, nanoindentation of polymers with a sharp indenter, Vol. 20, No.6, pp 1597-1605 , June 2005.

Kebin Geng, Fuqian Yang, Thad Druffel and Eric A. Grulke, Nanoindentation behavior of ultra thin polymeric films, Polymer ,46, 11768-11772, (2005).

J.D. Bressan, A.Tramontin and C.rosa ‘Modeling of nanoindentation of bulk and thin films by7 finite element method’ Wear, V 258, 1-4, pp 115-122, January, 2005

J.A. Knapp, D.M. Follstaedt, S.M. Myers, J.C. vdBarbour, and T.A. Friedermann. Finite-element aamodeling of nanoindentation, Journal of Applied ssPhysics, 85, 3(1999)

Ch. Srinivasa Rao, C. Eswara Reddy, Modeling and simulation of Nanoindentation into titanium Thin films by Finite element method, Journal of Technology, 1-6, No.2, Vol.3, June, 2007.

Ch. Srinivasa Rao, C. Eswara Reddy, ‘Finite Element Modeling of Nanoindentation To simulate the mechanical behaviour of bulk materials and thin films’, Journal of Technology, 6-12, No.3, Vol.3, September, 2007(In Press).

B.Oommen, K.J. Van Vliet, Effect of nanoscale thickness and elastic nonlinearity on measured mechanical properties of polymeric thin films, Thin Solid Films, 513, pp 235-242 (2006)

C. Klapperich, K. Komvopoulos, L. Pruitt Nanomechanical Properties of Polymers Determined From Nanoindentation Experiments Vol. 123, Trans. ASME, Journal of Tribology, 624-631, July 2001.

I.N.Sneddon, The relation between load and penetration in the axisymmetric bousinesq problem for a punch of arbitrary profile, Int. J. Eng.Sci. 3, 47, 1965.

Lee, E. H. and Radok, J. R. M., The contact problem for viscoelastic bodies. Trans. ASME, J. Appl. Mech., 27, 438–444, (1960).

Downloads

Published

2008-06-01

Issue

Section

Articles

How to Cite

[1]
“Modeling and Simulation of Nanoindentation into Polymer Thin Films by Finite Element Method”, JME, vol. 3, no. 2, pp. 97–103, Jun. 2008, Accessed: Nov. 03, 2024. [Online]. Available: https://smenec.org/index.php/1/article/view/625

Similar Articles

1-10 of 72

You may also start an advanced similarity search for this article.