Mechanical Characterization of Viscoelastic-Plastic Soft Matter Using Spherical Indentation
B Keerthika1, Y P Cao2, D Raabe1
Max-Planck-Institut fuer Eisenforschung, Duesseldorf, Germany
Institute of Biomechancis and Medical Engineering Department of Engineering Mechanics Tsinghua University, Beijing, P. R. China
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.
B. . Keerthika, Y. P. . Cao and D. . Raabe, "Mechanical characterization of viscoelastic-plastic soft matter using spherical indentation," Computers, Materials & Continua, vol. 10, no.3, pp. 243–258, 2009.
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