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Title: Indentation Measurements of Soft Materials using Optical Surface Deformation Measurements

Source: In: Proceedings of 2013 Society of Experimental Mechanics Annual Conference, Paper 460, 2013; 12 p.

Author(s)Wald, M.J.; Considine, J.M.; Turner, K.T.

Publication Year: 2013  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4709-4B

Abstract: Instrumented indentation is a common technique for measuring the elastic properties of bulk materials as well as thin films on substrates. However, in traditional indentation, it can be difficult to determine the true deformation of a specimen due to the effects of machine compliance and thermal drift. In the present work, a method is developed to track the in-plane and out-of-plane deformation of a specimen during indentation tests using fluorescent microparticles. Bead tracking and quantitative defocusing methods are used to track the in-plane and out-of plane displacements of the beads, respectively. Here, we describe the calibration of the system and assess the effects of particle size and magnification on the accuracy and resolution of the system. In addition, results from preliminary indentation tests performed on bulk polydimethylsiloxane specimens are reported. An analysis algorithm was developed to extract the elastic properties by measuring the displacements on the surface as a function of applied indentation force. Results are compared to traditional indentation measurements in which load and displacement are only measured at the indenter.

Keywords: Indentation; Soft Materials; Particle Tracking; Modulus; Poisson’s Ratio

Publication Review Process: Non-Refereed (Other)

File size: 474 kb(s)

Date posted: 05/30/2013
RITS Product ID: 64027
Current FPL Scientist associated with this product
Considine, John M.
Materials Research Engineer

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