TY  - EJOU
AU  - Keerthika, B  
AU  - Cao, Y P  
AU  - Raabe, D  

TI  - Mechanical Characterization of Viscoelastic-Plastic Soft Matter Using Spherical Indentation
T2  - Computers, Materials \& Continua

PY  - 2009
VL  - 10
IS  - 3
SN  - 1546-2226

AB  - In this study, effects of the plastic deformation and the time-dependent deformation behavior on the fundamental relations in the Oliver & Pharr method are studied by using finite element analysis based on a viscoelastic-plastic model developed for polymers. The study eventually yields an experimental protocol and using which, the instantaneous modulus of the viscoelastic-plastic materials may be reliably determined. Experiments have been performed on four polymers to verify the conclusions from the numerical analysis.
KW  - Nanoindentation
KW  -  soft matter
KW  -  viscoelastic properties
KW  -  adhesion effects

DO  - 10.3970/cmc.2009.010.243