Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

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
  

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »